p. 1 5.2. 7 White Croake r
Tabl e 5.2.7-1 . Estimate d tota l annua l entrainmen t (E r ) an d standar d erro r ( SE(E T ) ) fo r

whit e croake r

(Genyonemus lineatus) larva e fro mth e thre e analysi s periods . Analysi s Perio d PT SE(E T ) 1 ) Oc t 23 , 1996-Sep30 , 199 7 70,500,00 0 2 ) Oc t 1 , 1997-Se p 30 , 199 8 65,100,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 66,100,00 0 2,620,00 0 3,880,00 0 3,890,00 0

Tabl e 5.2.7-2 . Estimate dtota l annua l adjuste d entrainmen t (P Adj

_ T ) an d standar derro r

( SE(P

AdJ

_ T ) ) fo r whit e croake r

(Genyonemus lineatus) larva e fromth e thre e analysi s periods . Analysi s Perio d 'Adj-T .1 ) Oc t 23 , 1996-Se p 30 , 199 7 305,000,00 0 2 ) Oc t 1 , 1997-Se p 30 , 199 8 440,000,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 447,000,00 0 SP(P AJi -r) 11,300,00 0 26,300,00 0 26,300,00 0



# I I I TENER A E9-055. 0 5-28 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 2 5.2. 7 Whit e Croaker Tabl e 5.2.7-3 . Estimate dnumbe r o f white croake

r adult female s (FH) whos e reproductiv e output

wa s equivalent

t o th e adjusted numbe

r o f larvae entraine d pe

r yea r ( E Ac9

_T ) a t Diabl o Canyon Powe

r Plant includin g th e standar

d erro r ofth e estimat e (SE(FH)) an

d90 % confidenc e limit s (C.L.) . Analysi s Perio d FH Uppe r Lowe

r SE(FH) 90 % C.L . 90 % C.L . 1 ) Oct 23 , 1996-Sep 30 , 1997 2 ) Oct 1,1997-Se p 30 , 199 8 3 ) Jul 1 , 1997-Jun 30 , 199 8 5,11 0 12,30 0 268,00 0 7,38 0 17,80 0 387,00 0 9 7 14 1 7,50 0 18,100 394,00 0 14 3

Tabl e 5.2.7-4 . Whit

e croaker (Genyonemus lineatus): Sensitivit y analysi s fo

r FH fro m th e thre e analysi s period s recalculate d fo r each mode

l inpu t parameter

(ff ): E Adj

_ T ± 1.64 5 SE(ff); other

parameter s are Q. e t\.MSCV0) wher e CV(0) = 1. 0 o r 100% . a ) Analysi s Perio d1 : Oc t

1 , 1996-Sep t

30,199 7 Parameter FH ^Adj-T S egg S larvae U Eggs/y r Longevit y Maturatio n Estimat

e

= 5,11 0 305,000,00 0 0.60 7 0.18 7 105,000 1 2 2 Minimu

m 4,80 0 3,100 98 7 98 7 2,32 0 4,65 0 Recalculate dFH

Maximu m 5,43 0 26,50 0 •26,50 0 26,50 0 162,000 6,39 0 Rang e

62 6 23,40 0 25,50 0 25,50 0 159,000 1,74 0

TENERA E9-055. 0 5-28 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 3 5.2. 7 Whit e Croake r
Tabl e 5.2.7-4 . Whit

e croake r (Genyonemus lineatus): Sensitivit y analysi s fo

r FH fro mthe thre e analysi s period s recalculate d fo r eac h mode l inpu t paramete r (ff): E

Adj

_ T ± 1.64 5 SE(6) ; othe

r parameter s ar

e 0. e ±\M5Cr0) w hereCV(ff)= 1. 0 or 100 % b ) Analysi s Perio d 2 : Oc t 1 , 1997-Sep t

30 , 199 8
Paramete r FH pAdj-T S egg S larvae #Eggs/y r Longevit y Maturatio n Estimat e

= 7,38 0 440,000,00 0 0.60 7 0.18 7 105,00 0 1 2 2 Minimu m

6,66 0 4,48 0 1,420 1,420 3,36 0 6,71 0 Recalculate d FH

Maximu m 8,11 0 38,20 0 38,20 0 38,20 0 233,00 0 9,23 0 Rang e

1,45 0 33,80 0 36,80 0 36,80 0 230,00 0 2,52 0

c ) Analysi s Perio d 3 : July 1 , 1997-Jun e 30 , 199 8


# 1 i t

! 

# I I Paramete r FH E ^•Adj-T S egg S larvae #Eggs/y r Longevit y Maturatio n Estimat e

= 7,50 0 447,000,00 0 0.60 7 0.18 7 105,00 0 1 2 2 Minimu m

6,78 0 4,55 0 1,45 0 1,45 0 3,41 0 6,82 0 Recalculate d FH

Maximu m 8,23 0 38,90 0 38,90 0 38,90 0 237,00 0 9,38 0 Rang e

1,45 0 34,30 0 37,40 0 37,40 0 234,00 0 2,56 0

TENER A E9-055. 0 5-28 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 4 5.2. 7 Whit e Croake r
Tabl e 5.2.7-5 . White croake r (Genyonemus lineatus): Monthl y estimate s o f proportiona

l entrainment( PE, ) an

d annua l proportion o f

larvae hatched i

n th e ith surve y perio d (/• ) an d associate d standar

d error s (SE) use d i

n estimatin g entrainmentmortalit y fo r tw o analysi s periods . a ) Analysi s Perio d 3 : Jul y 1 , 1997-Jun e 30 , 199 8 Surve y Star

tDat e PP SE 

# ffl f SP(f) Ju l 21 , 199 7 Au g 25 , 199 7 Se p 29 , 199 7 Oc t 20 , 199 7 No v 17 , 199 7 De c 10 , 199 7 Ja n 22 , 199 8 Fe b 26 , 199 8 Ma r 18 , 199 8 Ap r 15 , 199 8 Ma y18 , 199 8 Ju n 8 , 199 8 0.024 4

0 0 0 0 0 0.034 0 0.00063 0 0.00039 0 0.0020 3 0.0052 6 0.0094 8 0.029 3

0 0 0 0 0 0.0085 8 0.00045 0 0.00012 0 0.00072 0 0.0014 6 0.011 6 0.0070 4

0.0044 7 0.0058 4 0.00057 0 0.0013 5 0.062 8 0.13 9 0.0078 0 0.053 2 0.29 3 0.42 5 0.00059 0 0.00089 0

0.00062 0 0.00069 0 0.00022 0 0.00037 0 0.0045 7 0.0048 9 0.00075 0 0.0027 7 0.0093 2 0.010 7 0.00020 0
b ) Analysi s Perio d 4 : Jul y 1,1998-Jun e 30 , 199 9 Surve y Star

tDate PE, SE 

# m f SP(f) Ju l 21 , 199 8 Au g 26 , 199 8 Se p 16 , 199 8 Oc t 6 , 199 8 No v 11 , 199 8 De c 9 , 199 8 Ja n 12 , 199 9 Fe b 3,199 9 Ma r 17 , 199 9 Ap r 14 , 199 9 Ma y24 , 199 9 Ju n 23 , 199 9

ER AE9-055. 0 0

0 0 0 0 0.0054 5 0.0049 2 0.012 2 0.030 2 0 0 0 0

0 0 0 0 0.0032 5 0.00083 0 0.0055 8 0.010 4 0 0 0

5-28 6 0.0022 1

0 0 0 0 0.034 8 0.67 3 0.10 4 0.18 6 0 0 0 0.00081 0

0 0 0 0 0.0033 8 0.0093 1 0.0060 6 0.0072 8 0 0 0

Fina l 316(b ) Demonstratio

n March 1,200 0 

# 1 IP. 5
5.2. 7 Whit e Croake r

"

. . t u w T — + C O E
C O c c u QMean 0.38 - 0.36 - 0.34 - 0.32 - 0.30 - 0.28 - 0.26 - 0.24 - 0.22 - 0.20 - 0.18 - 0.16 - 0.14 - 0.12 - 0.10 - 0.08 - 0.06 - 0.04 - 0.02 - o.oo -

• designatessurv

e j 

# Jl h III
. I t . 1 -

Whit e croake r(Genyonemus lineatus)

Sn " ir?ir"''"r"'"!"nm T r | 0 | N | D | J | F | M | A | M 

### I 199 6 

### 1
y wit h density * 0 

## .(.Ji t mmtriit i m ? » * J|J|A|S|O|N|D|J|F|M|A|M|J|J|A|S|O|N|D | 199 7 | 109 8 |

Surve y Dat e • ' , 1 t j|F|M|A|M|J | 1S9 9 

### 1

Figure 5.2.7-1 . Weekl y mea n larva l densit y (#/m

3 + 1 S.E. ) a

t the DCP

P intake .

TENER A E9-055. 0 5-28 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0r n

z m 

# n m C O o O l y i b

• 0 0 o o

3 Q L c o cn 

# i i

- ^- * t o C U o s a o o o 3 Whit e croake r(Genyonemus lineatus)

C O 

# E 4. 0

3. 5 3. 0 2. 5 2. 0 1.5 1. 0 0. 5 0. 0

Dept h Contour s

- - 2 0 meters "

—4 0 meter s
• —6 0 meters Poin t Bucho n

DCP P Intak e

Poin t Sa n Lui s

Jul . 21.'9 7 Aug . 25 , "9 7 Sep . 29 , "9

7 Oct . 20 , "9

7 Nov . 17,'9 7 Dec . 10,'9 7 Figur e 5.2.7-2a . Mea

n larval density (#/m 1 ) collecte d i n th e DCP P stud y gri d cell s an d a t tiie entrainmen t

samplin g location . c n $ 3 " 

### o 3 0 ) sr .

T

J b >m

z m m C O I o 0 1 O !

y i 1 ro 0 0 c o

3 9 L 1 0

-- tn mm t o cu O ~* . o o O 3 Whit e croake r(Genyonemu s lineatus )

C O 

# E 4. 0

3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0. 0

Dept h Contours

- 2 0 meter s

— — 4 0 meters •m^m 6 0 meter s Poin t Bucho n
DCP P Intak

e

Poin t Sa n Lui s

Jan
. 22 , '9 8 Feb
. 26 , '9 8 Mar
. 18 , '9 8 Apr
. 15 , '9 8 Ma y 18 , '9 8 Jun
. 8 , '9 8 

### Figur e 5.2.7-2 b (continued) . Mea

n larva l densit y (tf/m 1 

### ) collectedin th

e DCP P stud y gri dcell s an

d a t di e entrainmen

t sampling location .

::;3m

z m m ( O i o O l O l

t o ( O o

3 cu _ C O at &_ 2 O 

# I f
t o c u O mf. o o O 3 Whit e croake r(Genyonemu s lineatus )

c o 4. 0

3. 5 3. 0 2. 5 2. 0 1. 5 1.0 0. 5 0. 0

Dept h Contour

s

— —2 0 meter

s • ^ —4 0 meter

s

— • 60 meter

s Poin t Bucho n
DCP P Intak

e

Poin t Sa n Lui s

Jul
. 20 , '9 8 Aug
. 25 , '9 8 Sep
. 15 , *9 8 Oct
. 5 , "9 8 No v10 , '9 8 Dec
. 8 , '9 8 

### Figur e 5.2.7-2c (continued) . Mea n larva l densit y (#/m 3 

### ) collectedi

n th e DCP P stud y grid cell s an

d a t th e entrainmen

t sampling location . t o
ZT 

### o 5 C D '

" •

b om

z m 

## £ m c o • o O l O l b

0 1 I r o co

3 9 L w at 

### 2 ° 

# M t o S o =• . o o o 3 Whit e croake r (Genyonemu s lineatus )

C O 

# E 4. 0 3. 5 3. 0 2. 5 2. 0 1. 5 1. 0 0. 5 0. 0

Dept h Contour

s

• 2 0 meter

s
• —4 0 meter

s
• — • 6 0 meter

s Poin t Bucho n
DCP P Intak e

Poin t Sa n Lui s

Jan . 11,'9 9 Feb . 2,'9 9 Mar . 16,'9 9 Apr . 13,'9 9 Ma y 23 , *9 9 Ju n 22,'9 9 Figur e 5.2.7-2 d (continued) . Mean larva l densit y (tf/m- 1 ) collecte d in th e DCPP study gri d cell s an d a t th e entrainmen t

samplin g location . r o • ^ 1
O 1 o 0 1 X " C D

"•

c oP.1 0 5.2. 7 Whit e Croake r

C D o c 

## a i
_ 3 O O O o C s - C U 3 c r a > c O a . 

# il l Whit e croake r(Genyonemus lineatus) N = 3,52 9

1 m-m*T~~mm T ~~^-T^mm.~T O. S 1.3 . 1. 8 2. 3 2 . a 3. 3 3. 8 4. 3 4. 8 S. 3 f * Lengt h Categor

y (mm )

o - r — 1 2 - I —

1 5 - 1 rrr 2 1 Estimate d ag e (days ) Figur e 5.2.7-3 . Lengt

h frequenc y o f

al l measure d larva

l fish collecte d i

n th e entrainment samples . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva

l length s ar

e noted . X-axi s scal e i s no t

continuou s at

large r lengths .

TENER A E9-055. 0 5-29 2 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 7 Whit e Croaker p.1 1

Whit e croake r(Genyonemus lineatus)

1 5 - 1

l O -

Cl ) u C 5- 1 C D

O 1 %

Mi n Media n Entrainment : N=15 0 Mea n 99 % V I a x

> » « 15- | c C D 3 —

| Mi n c r C D
" - io- " c C D O C D 5 — 1 % 2. 0 2. 5 3. 0 3. 5 Grid : N=1,26 3 Median ! Mea n 4. 0 4. 5 V****? ?

99 % Ma x



# llilhhliilii . l l 1. 0 1. 5 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 r ^"J

Lengt h Categor

y (mm )
Figure 5.2.7-4 . Lengt

h frequency of

measured fish fro

mentrainmen

t survey s tha

t paire d wit h grid survey s (bot

h year s combined) . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva l length s ar

e noted . X-axi s scale i s no

t continuou s a

t large r lengths . TENER A E9-055. 0 5-29 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 2
5.2. 7 Whit e Croake rS.E.)
E 5S ,MeanDensity 0.6 0 —

0.5 5 ~ = 0.50"- = 0.45-* : 0.40- : 0.3 5 — 0.30- J 0.25- ^ 0.20- ^ O-15- i 0.1 0 — 0.05~ | 0.0 0 ~ E -0.0 5 - = -0.1 0 — Whit e croake r(Genyonemus lineatus) 

# I I

T 

# i i i

• m lllll l 199 0 199 1 199 2 199 3 199 4 199 5 Yea r \

i 199 6 i
I 199 7 i

I

199 8

Figur e 5.2.7-5 . Annua

l mea n densit y +/
- 2 standar

d error s (vertica

l lines ) an d grand mea

n densit y fo r al l year s combine d(horizontal line ) fo r th e Intak e Cov e surfac e plankto n tows . Th e annua l mea n densitie s ar

e basedo n seven consecutiv e month s o f data(Decembe

r through June ) excep t fo r 1990 , whic h ha

donl y five month s (Februar y diroug h June) .

TENERA E9-055. 0 5-29 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 3 5.2. 7 Whit s Croake r
Whit e croake r(Genyonemus lineatus)

- mea n duratio n 0.24 0 ~ 0.210 - O.10 2 - o.-ie e 0.14 4 £ 0.12 0 o.oe e 0.07 2 - 0.04 8 0.02 4 — o.oo o Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

R s alona'hor a Estimat e 90 % C.l
. Densit y Extrapolate d R a

Pu= 0.0025 5 ±0.026 6

III I O xS xlO x1B x20 x2S xSO xSS x40 x O k m S 7 k m

17 4 K m

20 1 K m

34 7 k m

43 4 k m

S2 1 k m

60 8 k m

BB S k n Siz e e f Populatio n Relativ e t o Stud y Gri d Equivalen t Dlatane e Alongthor a Whit e croake r(Genyonemus lineatus)

- mea n duratio n Analysi s Peno d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % C.l
.

O x O k m S x

8 7 k m 1 0 x 1 S x 20 x

1 7 4 k m 28 1 k m 34 7 k n 2 S x SO x SS X 40 x 4 3 4 k m S2 1 k m 80 8 k m 69 6 k m Siz e o f Populatio n Relativ e t o Stud y Gri d Equivalen t Distanc e Alongihor * Figur e 5.2.7-6a . Tota

l annua l entrainmen

tmortalit y (P^) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal o f di e fraction ofth e populatio n a tris k an d containe d i n di e study gri d (p" s ) use d t o approximat

e di e alongshor e exten to f di e study gri d populatio n expande d o n di e basi s o f alongshor e curren

tmovements an

d di e offshor e extrapolatio n o f study gri d abundance extende d alongshor e usin g bot h onshor e an

d alongshor e curren

tmovements wid i 90 % CI.' s indicated . TENER A E9-055. 0 5-29 5 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.1 4 5.2. 7 Whit

e Croake r Whit e croake r (Genyonemus lineatus)

- maximu m duratio n

R a alongshor e Analysi s Perio d 3 : Ju l 1997-Ju n 199 8 Densit y Extrapolate

d Ps of f scal e 1/Ps=12 8 P M = 0.0013 3 ±0.026 5

Estimat e 90 % C.l .

O x O k m S x

8 7 k m —i—|—i—i—i—l—|—l—l—.—i—|— r

l O x IS x 20 x 2S x 1 7 4 k m 28 1 k m 34 7 k m 43 4 k r SO x SS x 40 x 6 2 1 k m 80 8 k m 80 S k m Siz e o f Populatio n Relativ e t o Stud y Gri d Equivalen t Distanc e Alongshor e Whit e croake r (Genyonemus lineatus)

- maximu m duratio n

O.OO * Analysi s Perio d 4 : Ju l 1998-Ju n 199 9 Estimat e 90 % C.l . Densit y Extrapolate d R a

O x S x 10 x IS x 20 x 26 x 30 x SS x 40 x O k m 8 7 k m 17 4 k m 28 1 k m 34 7 k m 43 4 k m S2 1 k m 80 8 k m 80 S k m Siz e o f Populatio n Relativ e t o Stud y Gri d Equivalen t Diatano e Alongshor e Figure 5.2.7-6b . Tota

l annua l entrainment

mortalit y (P^) an d 90 % confidenc e interva

l (CI. ) a s afunctio n o f

di e reciprocal o f

di e fraction o f

di e populatio n a

t risk and containe d in di e stud

y gri d ( R ) use dt o approximat

e di e alongshor

e extent ofth e stud

y gri d populatio n expande d o n th e basi s o f alongshor e current movement s and di e offshor e extrapolatio n o f

stud y gri d abundanc e extende dalongshore usin g bodi onshore an d alongshor e current movement s widi 90 % CI.' s indicated . TENER A E9-055. 0 5-29 6 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.1 5

- ^ 5.2. 7 White Croake r

Commercia l Whit e Croake r (Genyonemus lineatus)

Landing s fro m th e Morr o Ba y Area 10 0

- • 8 0 ^•60 - I 40
- 2 0 0 

## n W 1
_

- •Morr o Ba y (MT ) DPor t Sa n Lui s (MT ) 

# nA I L J J i n r O ) r o > O r o > C

O o > o 0 0 c n m r - O ) « - c o c o c o c n c n c n c n o> C O Ot Or W c n ot c n Yea r Figure 5.2.7-7 . Annua

l commercia

l landing s (MT ) o f

whit e croake r (Genyonemus lineatus) a t port s i n th e Morr

o Ba y are a(source : Californi aDepartmen t o f Fis h an d Gam e Database) .

TENER A E9-055. 0 5-29 7 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.1 6

I 

# Blan k Pag e5.2. 8 Monkeyfac e Pricklebac k



### 5.2.8 Assessment

of Monkeyface

Prickleback

(Cebidichthys violaceus)

Cebidichthys violaceus (Girar d 1854) ; monkeyfac e prickleback ; lengt h t o 7 6 cm ; souther n Oregon to Bahi aSa

n Quintin , north-centra

l Baj aCalifornia ; intertida l to 2 4 m ; unifor

mblack , olive , o

r gray , excep t

fo r blac k streak s a t ey e (Mille r an dLe a1972 ; Eschmeye

r et al . 1983) . Th e monkeyfac e prickleback (Cebidichthys violaceus) i s amembe r ofth e famil

y Stichaeidae , i whic h i s primarily distribute di

n th e norther

n Pacifi c Ocea

n (Nelso n 1994) . Th

e famil y consist s o f thre e subfamilies , 3 1 genera , an d about 6 0 specie s (Nelso n 1994) . Th e monkeyfac e prickleback

belong s to th e subfamil

y Xiphisterinae , whic

h contain s 1 5 species , severa l o f whic h ar e commo n to th e Californi acoas t

(Miller an d Le a1972 ; Nelso n 1984) . The monkeyfac e prickleback

i s foun da s fa r sout h a s centra

l Baj aCalifornia , Mexic o bu t i s rar e sout h o f Poin t Conceptio n (Burg e an

dSchult z 1973 ; Love 1996) . The

y ar e common i

n crevice s an

d rock s fro m th e uppe r intertida l t o shallo w rock

y reef s a t depth s o f abou t 24 man d appea r to b e highly territoria l (Wang 1986 ; Love 1996) . The y ar e not commonl y sighte d subtidally becaus e o f their crypti c natur

e (Burg e an

dSchult z 1973) . I n centra l California , juvenile s ar

e mos t abundan t i n wate r about 0. 5 mabov e mea

n lowe r lo w wate r (MLLW ) tida l heigh t an d commonl

y foun dunde r rock s a t lo w tid e (Lov e 1996) . Investigation s int o the diet o f thi s fish i n Diabl o Cove revea

l i t i s a n herbivor e feeding largel

y o n red alga e (Burg e an

d Schult z 1973) . Monkeyfac e prickleback

la y demersal , adhesiv e egg s (Wang 1986 ; Fitch an d Lavenber

g 1971 ; Baxte r 1974) an dexhibi t parenta l egg-guardin g behavio

r (Fitch an d Lavenber

g 1971 ; Ban

e an d Ban e 1971) . Spawning ha s bee n reporte d fro

mJanuar y to Ma y (Fitc h an

d Lavenber

g 1971 ; Baxte r 1974 ; Wan

g 1986 ; Love 1996) . I

n Diabl o Cove , female s wer e ful l of egg s i n January , containe dsmall undevelope degg s i n July , an d ha d spen t ovarie s i n Septembe

r (Burg e an d Schult z 1973) . Thi s evidence , couple d wit h the presenc e of

young-of-the-yea

r (YOY ) i n fall , suggest s lat

e summe r spawning (Burg e an

d Schult z 1973) . Additionally , maturin g ovarie s wer e TENER A E9-055. 0 5-29 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 8 5.2. 8 Monkeyfac e Pricklebac k observe dfro

mDecembe

r throug h June , matur

e ovarie s fro

mMarch throug h May , an d spen t ovarie s fro mFebruar

y throug h Augus t

wit h one i n December . Olde

r fis h appea r t o spawn earlier i n th e seaso n tha

n younge r fish (Marshal l an

d Wylli e Echeverri a1991) . * * Fecundit y increase s wit

h ag e an dlength . Smalle

r fish produc e 6,000 t o 8,000 egg s (Fitc h an d Lavenberg 1971 ; Baxter

1974 ) whil e large

r female s produc e more . A 4 1 cmS L femal e age d 7 y r produce d17,500 eggs , an

da6 1 c mS L female aged 1 1 y r

ha d 46,00 0 egg s (Marshal l an d Wylli e Echeverri a1991) . Monkeyfac e pricklebac k

larvae are planktoni c (Wang 1986) , bu t littl e els e i s known about

th e earl y lif e histor y o f thi s species . A famil

y member , th e black

pricklebac k

(Xiphister atropurpureus), wa s shown t o hav e marke d positiv e phototaxi s (attractio n t o light) fo r 3- 5 d , afte r which time the y becom

e negativel y phototacti c (Peppa r 196 5 i n Colema n 1992) . Ther

e wer e n o dat aon monkeyfac e pricklebac k larva l growt h rate s i n th e literature . Th e larva

l growt h rate (Stepien 1986) fo

r a n ecologicall y simila

r species , th e gian

t kelpfis h (Heterostichus rostratus, famil y Clinidae) , wa s substitute dfo r th e missin g C . violaceus growt h rate . Th e accurac y o f

thi s growt h rate a s i t applie s t o monkeyfac e pricklebac k i s unknown , but

i t represent s th e bes t availabl e dat afro

mth e current

scientifi c literature . Longevit y ofth e monkeyfac e pricklebac k wa s estimate d a

t 1 8 y r fro ma6 7 c mS L fish (Marshal l an d Wylli e Echeverri a1991) . Female s 2 0 c mi n lengt h fro mMonterey Bay , Californi awer e aged a t 1 2 t o 1 5 y r

(Fitc h andLavenberg 1971) . Th e oldes t ag e estimate d fro

mfish collecte d i

n Diabl o Cov e wa s 1 4 yr

basedo n tw o individual s tha

t wer e approximately 4 9 c

mS L an d 6 4 c mS L (Burg e an dSchult z 1973) . Considerin g thi s specie s reache s 7 6 c mS L (Eschmeyer

et al . 1983) , i

t probabl y live s longer . Fitch an dLavenber

g (1971 ) reporte d th e ag e a t 50 % maturit

y a t 3- 4 yr . However , Marshal l an

dWylli e Echeverri a(1991 ) determine d tha t ag e a t first maturit y i s 4 yr , ag e a t 50 % maturit

y i s 5 yr , an

dag e a t 100 % maturit

y i s 7 yr . Th e fisher y fo r monkeyfac e pricklebac k

i s largely recreationa

l although som

e ar e sold commerciall y (Wan g 1986 ; Lov e 1996) . They ar e usually caugh

t usin g afishing metho d calle d

TENERA E9-055. 0 5-29 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.1 9 

# 1 1 I 1 1 1 1

1 I I I 5.2. 8 Rflorakeylfac e Pricklebac k "poke-poling " among intertida l rocks . A small commercia l fishery ha s bee

n underwa y i n th e Morr o Ba y are asinc e 199 3 (Californi aDepartmen t o f Fish an d Gam e Database) . S.2.8. H Summmroair

y © f Fo@!d l C@il©©ttDomi s Abundance s o f

monkeyfac e pricklebac k

larva e a t th e DCP P intak e structur e wer e seasona l durin g th e year s 1996-199 9 (Appemiiix M) , wit h highes t densitie s occurrin g durin g th e sprin g an d summe r (Figonr e 5.2.8-1) . Fe

w larva e o f thi s specie s wer

e collecte d durin g di e month s o f Augus t throug h December . I

t appear s dia

t th e initiatio n o f

reproductio n i

n monkeyfac e pricklebac k

migh t hav e bee n delaye dby amont

h o r tw o durin g 1998 . Thi s migh t hav e bee n du e t o th e E

I Nin o ) j even

t dia t bega n i n 199 7 (Lyn n et al . 1998 ; NOA

A 1999) . Ther

e wer e 7,09 0 larva

l monkeyfac e pricklebac k

identifie dfro

m1,25 3 bong o ne

t subsample s collecte d a

t di e DCP P intak e structure between Octobe

r 199 6 an dJun e 199 9 representin g 27 % o f di e intak e subsample s collecte d an

d processe ddurin g tha

t period . Monkeyfac e pricklebac k

larva e wer e generall y present

i n di e DCP P stud y gri d durin g Januar

y throug h Jul y o f

each yea r (Apperadl k M) , wit h thei r highes t abundanc e occurrin g durin g Ma y 199 8 an dApril-May 199 9 (Figuiir

e 5.2.8^2) . The

y wer e distribute d i

n highe r densit y i n th e cell s closes t t o shor e i n th e souther

n hal f o f th e grid . Ther

e wer e 904 larva

l monkeyfac e pricklebac k identifie dfro

m29 4 bong o ne

t subsample s representin g 10 % ofth e stud y gri d subsample s collecte dan

dprocesse dfro

mJul y 1997-Jun e 1999 . Standar dlength s o f

all monkeyfac e prickleback larva e collecte d a

t th e DCP P intak e structur e betwee n Octobe r 199 6 an dJune 199 9 range d fro

maminimu

mo f 2. 8 m mt o amaximu

mo f 24. 6 mm ; correspondin g ag e estimate s range d fro mzero day s (jus t

hatched) t o abou

t 8 8 d (Figur e 5.2.8-3) . Th e growt

h rate o f larva l giant kelpfis h (0.2 5 mm/d) reporte d b y Stepien (1986 ) wa s used to estimate age s o f

thes e monkeyfac e pricklebac k larvae . Th

e centra l 98 % o f thi s length-frequenc y distributio n resulte di

n minimu man d maximu mlength s fo

r th e analyse s o f

5. 7 m man d 1 2 mm , respectively . The mea

n larva l lengt h i n thi s distributio n wa s 7.3 3 mm , whic h corresponde d t o a

n estimate dag e o f

6. 5 d . W e assumed tha

t larva e shorte r tha n th e minimu

mlengt h ofth e centra

l 98 % ofth e distributio n ha

djus t hatche d an

d wer e age d zer o days . Subsequen

t age s wer e estimate d TENER A E9-055. 0 5-30 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 0 5.2. 8 Monkeyfac e Pricklebac k
fro m thi s assume d hatc

h length . N o reported hatchin g lengt h fo r monkeyfac e prickleback wa s found i n th e scientifi c literature . Reported hatchin g siz e fo r bluebarred pricklebac k (Plectobranchus evides) i s <7. 4 m m (Mose r 1996) . Individual s tha tappeared t o b e differen tage s

*• % base d o n lengt

h migh tb e th e sam e ag e a s a resul to f natura l variatio n i

n hatchin g siz e o r variabl e shrinkag e after preservation . Thus , i ti s possibl e tha

ta tleas tsom e ofth e smaller-size d larvae , a t leas tu p t o 5. 7 m

m an d possibl y larger , ha

d jus thatche d befor e bein g caught . Distribution s o f

monkeyfac e prickleback larva l length s a

tth e DCP

P intake structur

e an d i n th e stud y grid wer e compare d usin g a Kolmogorov-Smirno v tes t(Figur e 5.2.8-4) . Th e tes tdi d not detec ta significan tdifferenc e betwee n di e tw o distribution s ( p > 0.288) . A t-test als o di d no t detec ta significan tdifferenc e ( p > 0.75 ) betwee n th e mea n length s from th e tw o locations . O n average , thes e larvae wer e estimate d t o b e abou t6. 5 d old , indicatin g tha tdi e powe r plant entrain s relativel y youn g monkeyfac e pricklebac k larvae . I n addition , thes e dat

a indicate dia tdi e ag e an d siz e structur

e o f di e populatio n entraine d i s nearl y identical t o dia to f di e populatio n a

t risk . 

### 5.2.8. 2 Estimatin g Tota l Annua l Entrainmen t Th e annua

l estimate s ofth e averag e entrainmentfo r 1996-9 7 Analysi s Perio d 1 (E T = 106,000,000 ) an

d 1997-9 8 Analysi s Perio d 2( ^ = 119,000,000 ) wer e simila r (Tabl e 5.2.8-1) . Th e smal l difference s i

n th e estimate d entrainmentnumbers ar e no tstatisticall y significan t becaus e 95 % confidenc e interval s approximate d b y ± 2 • SE(E T ) woul d no toverlap . Annua l entrainmentestimate s o f monkeyfac e pricklebac k larvae , adjusted t o th e long-term averag e fro

m nin e year s o f

Intake Cov e plankto n samplin g (Figur e 5.2.8-5) , ranged fro m 61,500,00 0 (SE =5,580,000 ) i n Analysi s Perio d 2 t o 83,100,00 0 (SE =8,160,000 ) i n Analysi s Perio d 1 (Tabl e 5.2.8-2) . Th e adjustmentinde x ( / //, ) wa s calculate d a s th e rati o betwee n th e nin e yea r averag e ( /

) o f Intak e Cov e samplin g an

d th e averag e annua

l index estimate d fro

m thes e sam e tow s durin g th e yea r bein g adjuste d (/,) . Th e averag e inde x fo r th e year s 199 7 an d 199 8 (/; ) wer e 0.01 9 an

d 0.02 9 larvae/m 3 , respectively , whil e th e long-ter m averag e inde x (7 ) wa s 0.014 8 larvae/m 3 fo r th e year s 1990-1998 , yieldin g th e ratio s 111, o f 0.78 3 fo r 199 7 an

d TENERA E9-055. 0 5-30 1 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.2 1 5.2. 8 Monkeyface Pricklebac k 0.51 7 fo r 1998 . Th e difference s betwee

n the adjuste

d estimate s wer

e no t statistically significan

t becaus e 95 % confidenc e interval s approximate d b y ± 2 • SE(E

Adj

_ T ) did no t overlap . NOTE : Entrainmen

t estimate s for

monkeyfac e prickleback

larva e wer e no t use d t o calculat

e annua l adult losse s (FH

or AEL) becaus e ther

e wer e insufficien

t demographi c datawit

h whic h to parameteriz e thes e approaches . 

### 5.2.8. 3 Empirica l Transpor t Mode l (ETM) Monthly estimate s o f

proportiona

l entrainmen

t (PE,) i n th e survey s fro

mth e tw o analysi s period s rangedfro

maminimu

mo f zer o to amaximu

mo f 0.859±0.464 (±\SE(PE,)) i n Januar y 199 9 (Tabl e 5.2.8-3) . Period s whe n bot h PE, an d th e annua

l proportio n o f

larva e hatchedi

n th e hh surve y perio d(f) wer

e equa l t o zero indicated tha

t n o larva e wer e collecte d a

t either th e DCP P intak e or fro mth e stud

y grid . Whe

n PE, = 0 bu

t fj>0, larva

e wer e collecte d a

t th e DCP P intak e durin g th e survey perio dbu t no t durin g the entrainmen

t survey paire d wit

h th e 72-hou

r stud y gri dsurvey . The larges t

value s of /

occurre d betwee

n Apri l an d Jun e i n bot h analysi s period s indicatin g tha

t thes e wer e period s o f

hig h monkeyfac e prickleback

larva l abundanc e a

t th e intak e structure . Thes e survey s wer e als o associate d wit

h th e larges t

value s o f PE, excep t

fo r th e estimate i

n Januar y 1999 . Sinc e f

wa s use d to weigh t individua l estimate s of

PE,, thos e wit h highe r f value s wer

e proportionally mor

e importan t t o th e annua

l entrainmen

t mortalit y estimates . Larva l monkeyfac e prickleback

wer e distribute d clos e to shor

e i n th e stud y grid subsample s (Figur e 5.2.8.2 ) an

dsimila r t o observed adul

t distribution s i

n shallo w nearshor

e area s u p t o depth s o f 2 5 m(Mille

r an dLe a1972) . Therefore , P s wa s onl y calculate d using alongshor e current movemen t an dno t offshor e extrapolatio n of

stud y gri d abundance . ETM

result s fo r monkeyfac e prickleback

show th e difference s i

n ho w estimate d larva

l duration s ca

n affec t calculatio n o f

P u (Figure s 5.2.8-6 aan

d b) . A s expected , value s fo r P M increas e wit

h increasin g value s o f P s (i.e. , decreasin g \IP S

) fo r shorte r larva l duratio n betwee

n periods . Th

e probabilit

y o f entrainmen

t i s les s fo r th e shorte r duratio n becaus e ofth e reduced time perio d fo r larva l transpor t t o occur . The differenc e betwee n year s fo r P M i s muc h les s fo r the shorte r larva l TENER A E9-055. 0 5-30 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 2 5.2. 8 Monkeyfac e Pricklebac k duratio n tha

n th e longe

r duratio n (0.1 1 to 0.1 6 vs . 0.1 1 t o 0.23) . The large r confidenc e interval s aroundP s fo

r th e longe r larva l duratio n reflec t

th e large r uncertaint y tha t result s fro mincrease d alongshore transport . Th e point estimate s fo

r P M fo r bot h larva l duration s ar

e greater durin g 1997-199 8 becaus e o f

weake r alongshor e current s associate d wit

h E l Nin o conditions . 

### 5.2.8. 4 Interpretatio n of Assessmen t Result s A limite dfisher

y exist s fo r monkeyfac e prickleback . Monkeyfac e pricklebac k landing s wer

e first recorde di n 199 3 a t Por t Sa n Lui s an d Morr o Bay , peaked i

n 1995 , and decline d through 199 8 (Figur e 5.2.8-7) . Landing s range d fro malo w o f 3 k g a t Por t Sa n Lui s i n 199 3 t o ahig

h o f 180 k g a t Morro Ba y i n 1995 . Th e averag e combine d annua l catc h between 199 3 and 199 8 fro mth e Morr o Ba y are awa s 7 5 kg/yr . Becaus e ofth e limite d fisher y fo r thi s species , there hav e bee n n o estimate s o f

stock siz e o r adul t density . Therefore , th e catch dat awil l no t b e used t o compar

e harves t mortalit y rate s t o P

M . The highes t

annua l densitie s o f

monkeyfac e pricklebac k

larva e fro mIntak e Cov e surfac e plankto n tow s occurre di

n 1990 . Abundance s i

n 199 7 an d 199 8 wer

e slightl y abov e th e long-ter m mea n densit y (Figur e 5.2.8-5) . Adult

monkeyfac e prickleback

abundanc e wa s low an

d variabl e on th e transect s surveye ddurin g th e DCP P Receivin g Wate

r Monitorin g Progra

mfish observation s fro

m197 8 t o 199 8 (Figur e 5.2.8-7) . Monkeyfac e pricklebac k hav e arelativel y long lifespa n tha t ha s bee n estimate da

t u p t o 1 8 y r fro ma6 7 c mS L fish (Marshal l an

d Wylli e Echeverri a1991) . Result s ofth e ETM sho w tha t th e powe r plan t ma y annuall y entrai n 11-23 % o f th e monkeyfac e pricklebac k larva e fro ma n are a7 t o 8 time s th e are aofth e stud y gri d (Figur e 5.2.8-6) . Th e wide rang e i

n th e siz e o f

larva e entraine d (< 3 m

mt o >24 mm ) indicat

e tha t monkeyfac e pricklebac k

larva e ar e vulnerabl e t o entrainmen t ove r alarg e portio n o f

thei r larva l lif e (Figur e 5.2.8-3) . Thi s coul dindicat e a n increase d potentia

l fo r impact s fro

mentrainment

o n thi s taxon . I

n th e absenc e o f

other estimate s o f

adult populatio n abundance , there i s no definitiv e wa y t o determin e whethe

r thi s leve l o f larva l mortalit y i s sufficien

t t o caus e along-ter

mloca l populatio n decline . However , thi s specie s i s widely distribute d fro msouther n Orego n t o Baja ,

TENER A E9-055. 0 5-30 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 3 5.2. 8 Monkeyfac e Pricklebac k

an di t i s unlikel y tha t larva l losse s fro mentrainmen

t tha t ma y affec t loca l adul t abundance s woul

d affec t th e large r population .

TENER A E9-055. 0 5-30 4 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.2 4 5.2. 8 Monkeyfac e Pricklebac k Tabl e 5.2.8-1 . Estimate dtota l annua l entrainment

(E T ) an d standar d erro r ( SE(Ej) ) fo

r monkeyfac e pricklebac k

(Cebidichthys violaceus) larvae fro m th e thre e analysi s periods . Analysi s Perio dE T SE(E T

) 1 ) Oc t 23 , 1996-Sep t

30 , 199 7 106,000,00 0 10,400,00 0 2 ) Oc t 1 , 1997-Sep 30 , 199 8 119,000,00 0 10,800,00 0 3 ) Jul 1,1997-Ju n 30 , 199 8 116,000,00 0 10,700,000
Tabl e 5.2.8-2 . Estimate dtota l annua l adjusted entrainment

(E Adj_-) an d standar derro r (SE(E AdJ

_T ) ) fo r monkeyfac e prickleback

(Cebidichthys violaceus) larvae fro

mth e thre e analysi s periods . Analysi s Perio d 1 ) Oc t 23 , 1996-Sep 30 , 199 7 2 ) Oc t 1 , 1997-Sep 30 , 199 8 3 ) Ju l 1,1997-Ju n 30,199 8 PAdj-T 83,100,00 0 61,500,00 0 60,200,00 0 SP{pAdj- T ) 8,160,00 0 5,580,00 0 5,520,00 0

TENERA E9-055. 0 5-30 5 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.2 5 5.2. 8 Monkeyface Pricklebac k Tabl e 5.2.8-3 . Monkeyfac e prickleback (Cebidichthys violaceus): Monthl y estimate s o f proportiona

l entrainment

(PE,) an d annua l proportio n o f

larva e hatche d i

n th e /t h survey perio d (_/• ) an d associate d standar

d error s (SE) use

d i n estimatin g entrainmen

t mortalit y fo r tw o analysi s periods . a ) Analysi s Perio d 3 : July 1 , 1997-Jun e 30 , 199 8 Surve y Star t Dat e PP SE(PE,) 

## f

b ) Analysi s Perio d 4 : Jul y 1 , 1998-Jun e 30 , 1999 Surve y Star t Dat e PE, SE^PE,) 

### f, SP(f) Ju l 21 , Au g 25 , Se p 29 , Oc t 20 , No v 17 , De c 10 , Ja n 22 , Fe b 26 , Ma r 18 , Ap r 15 , Ma y 18 , Ju n 8 , 199 7 199 7 199 7 199 7 199 7 199 7 199 8 199 8 199 8 199 8 199 8 199 8 0.024 7

0 0 0 0 0 0 0.0062 1 0.021 7 0.13 9 0.013 5 0.054 2 0.0072 3

0 0 0 0 0 0 0.0036 9 0.010 8 0.048 1 0.0030 1 0.012 3 0.043 7

0 0 0 0 0 0.0032 0 0.012 2 0.037 9 0.40 3 0.18 8 0.31 3 0.0024 8

0 0 0 0 0 0.00051 0 0.0010 1 0.0049 0 0.016 4 0.0098 1 0.012 6 

### SE(f) Ju l 21 , Au g 26 , Se p 16 , Oc t 6 , No v 11 , De c 9 , Ja n 12 , Fe b 3 , Mar 17 , Ap r 14 , Ma y 24 , Ju n 23 , 199 8 199 8 199 8 199 8 199 8 199 8 199 9 199 9 199 9 199 9 199 9 199 9

R A E9-055. 0 0.010 8

0 0 0 0 0 0.85 9 0.038 4 0.022 3 0.040 1 0.015 5 0.061 5

- 0.0097 2

0 0 0 0 0 0.46 4 0.024 5 0.0063 6 0.014 6 0.0044 0 0.017 0
5-30 6 0.058 0

0 0 0 0 0 0.011 6 0.038 9 0.11 9 0.43 4 0.17 8 0.16 1 0.0048 3

0 0 0 0 0 0.0011 4 0.0034 8 0.0053 8
' 0.014 0 0.0072 9 0.0066 7
Fina l 316(b ) Demonstration Marc h 1,200 0P.2 6
5.2. 8 Monkeyfac e Pricklebac k

0.3 4 0.3 2 ~ 0.30 -

- ^ 0.2 8 • U J ai E

C O c C D Q c C O C D 0.26 - 0.24 - 0.22 - 0.20 - 0.18 - 0.1 6 0.1 4 0.12 - 0.1 0 0.08 - 0.06 - 0.0 4 0.02 - 0.0 0 Monkeyfac e pricklebac k

(Cebidichthys

violaceus)

riimnnmimimnf

* IIIIIIIIMI I 

# . I I 1 111I I M I11111J11 1 N O J F ll|llll|lll l

4 I A M Surve y Oat e

• dosignatessurveywithden5ity= 0
Figur e 5.2.8-1 . Weekl

y mea n larva l densit y (#/m 3 + 1 S.E. ) a

t th e DCP P intake .

TENERA E9-055. 0 5-30 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 7 5.2. 8 Monkeyfac e Pricklebac k

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### i Z TENER A E9-055. 0 5-30 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 8 5.2. 8 Monkeyfac e Pricklebac k

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TENER A E9-055. 0 5-30 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0m

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. 15 , '9 8 Oct
. 5 . '9 8 No v10 , '9 8 Dec
. 8 , '9 8 Figur e 5.2.8-2 c (continued) . Mea n larva l densit y (U/m*) collecte d in th e DCP P study gri d cell s an d a t th e entrainmen t

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5.2. 8 Monkeyfac e Pricklebac k

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s B © • o C N i 0 0 C- 4 V * 3 D C TENER A E9-055. 0 5-31 1 Fina l 316(b ) Demonstratio n Marc h 1.200 05.2. 8 Monkeyfac e Pricklebac k P.3 1

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B I O 1 2 tA 1 6 1 8 ***-* • Estimate d age (days

) Figur e 5.2.8-3 . Lengt

h frequency o f

all measure d larva

l fis h collecte d i

n th e entrainmen

t samples . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva

l length s ar

e noted . X-axi s scal e i s not

continuou s a

t large r lengths .

TENER A E9-055. 0 5-31 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 2
5.2. 8 Monkeyfac e Pricklebac k Monkeyfac e pricklebac k

(Cebidichthys

violaceus)

is— I

10 -

C D U C 5 " I C D 3 C J o 

## o Mi n 1 % Entrainment : N=81 6 Media n Wea n 

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Lengt h Categor

y (mm )
Figur e 5.2.8-4 . Lengt

h frequenc y o f

measure d fish fro

mentrainment

survey s tha

t paire d wit

h gri dsurvey s (bot

h year s combined) . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva l length s ar

e noted . X-axi s scal e i s not continuou s a

t large r lengths . TENER A E9-055. 0 5-31 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0r - P.3 3
5.2. 8 Monkeyfac e Pricklebac k

u i C O I " + A E 5| .MeanDensity 0.1 2 — 0.1 1 - E 0.1 0 — 0.09* ^liIIIIIIMINICONCOO OOo dd o.os- E O.OA~Z 0.0 3 ~ E 0.02- z o.o i - E o.oo — Monkeyfac e pricklebac k (Cebidichthys

violaceus)

1 ? * i IIIIII I 199 0 199 1 199 2 199 3 1994 199 5 199 6 Yea r 

# I

l 199 7 i 199 8

Figure 5.2.8-5 . Annua

l mea n densit y +/
- 2 standar

d error s (vertica

l lines ) an d grand mea

n densit y fo r all year s combined(horizonta l line ) fo r th e Intak e Cove surfac e plankto n tows . Th e annua l mea n densitie s ar

e base do n seve n consecutiv e month s o f

data(Decembe

r throug h June ) excep t fo r 1990 , whic

h ha donly five month s (Februar y throug h June) .

TENER A E9-055. 0 5-31 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 4
5.2. 8 Monkeyfac e Pricklebac k Monkeyfac e pricklebac k (Cebidichthys

violaceus)

- mea n duratio n

O.OO * Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

P a alongahor e 90 % C.l
.

O x S x 10 x IS x 20 x 26 x SO x SS x 40 x O k m 8 7 K m 17 4 k m 261k m 34 7 k m 43 4 k m 62 1 k m 60 S k m SB S k m Siz e o f Populatio n 'Relativ e t o Stud y Oli d Equivalen t Diatano e Alongshor e Monkeyfac e pricklebac k (Cebidichthys

violaceus)

- mea n duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % C.l
.

Siz e o f Populatio n Relativ e t o Stud y Oli d Equivalen t Diatano e Alongahor e Figur e 5.2.8-6a . Tota

l annua l entrainmentmortalit

y (P^) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal o f di e fractio n o f

di e populatio n a

tris k an d containe d i n di e stud y gri d (P s ) use d t o approximat

e di e alongshor e exten tofth e study gri d populatio n expande d o n th e basi s o f alongshor e curren

tmovement s wid i th e 90 % C.I . indicated .

TENER A E9-055. 0 5-31 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 5
5.2. 8 Monkeyfac e Pricklebac k Monkeyfac e pricklebac k (Cebidichthys

violaceus)

- maximu m duratio n Analysi s Perio

d 3 : Ju l 1997-Ju n 1998

Estimat e 90 % C.l.

Siz e o f Populatio n Relativ e t o Stud y Oli d Equivalen t Diatano e Alongahor e Monkeyfac e pricklebac k (Cebidichthys

violaceus)

- maximu m duratio n Analysi s Perio

d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % C.l.

O x O k m S x

S T k m i—i—i—;—i —

lO x iS x i 7 4 k m 2S 1 k m 20 x 2S x 34 7 k m 43 4 k m —i—|—I—i—i—i—r—i— r SO x SS x 62 1 k m SO S k m 40 x 80 S k m Siz e o f Populatio n Relativ e t o Stud y Oli d Equivalen t Diatano e Alongahor e Figur e 5.2.8-6b . Tota

l annua l entrainmen

tmortalit y (/-^ ) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal o f di e fraction ofth e populatio n a tris k an d containe d i n di e stud y gri d ( P ) use d t o approximat e th e alongshor e exten tofth e study gn d populatio n expande d o n di e basi s o f alongshor e curren

tmovements wit

h di e 90 % CI . indicated .

TENERA E9-055. 0 M 1 6 Fina l 316(b ) Demonstratio n Marc h 1 . 200 0P.3 6



### a ) 5.2. 8 Monkeyfac e pricklebac k

« a > c • 3 c a Monkeyfac e pricklebac k (Cebidichthys

violaceus) Landing s fro m th e Morr o Ba y Are a 8 0 - 6 0 - 4 0 - 2 0 - 0 0 - 8 0 - 6 0 4 0 - 2 0 - 0 - DMorr o Ba y • Por t Sa n Lui s

" 1 1 1 1 1 1 1 1 1 1 1— H 1 1 1 1 1 1 —1 • • 1 •- A *•+•* - i n I* .

i » Ot ot

ot C

O ft

O O c n m

c o ot c o

c n o o o c n o

> c n n

Ol c n i o

O ) ot I -

Ot c n Yea r 

### b )

o C D C O C c o 0 ) 03 E l 

### o i n c C O C D E 

### Figure 5.2.8- 7 .Yearl

y abundanc e o f

monkeyfac e pricklebac

k measuredb

y tw o independen

t methods : a

) Commercia

l landing s of

adult s fro mMorr o Ba y area , b ) Mea

n numbe r offis h observe d pe

r 50-mete r subtida l benthi c transec t

in th e DCP

P RWMP Sout

h Contro l area . Splin e smoothin g algorith muse d t o dra w the curve throug

h th e points .

TENER A E9-055. 0 5-31 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 7 5.2. 9 Kelpfishe s 

### 5.2.9 Assessment

of Clinid Kelpfishes

(Clinidae)

Gibbonsia elegans (Coope r 1864) ; spotte d kelpfish ; lengt h to 1 6 cm ; Piedra s Blanca s Pt. , centra

l Californi ato Bahi aMagdalena , souther n Baj aCalifornia , includin g Isl aGuadalupe ; to 5 6 m(Mille r an d Le a1972 ; Eschmeye

r et al . 1983) ; green t o brow

n or ta n or reddish , ofte

n blotched or

streake d (Eschmeye

r et al . 1983) . Gibbonsia metzi Hubb s 1927 ; stripe d kelpfish ; lengt h t o 2 4 cm ; Vancouve

r Is. , Britis h Columbi ato PuntaRompiente , centra l Baj aCalifornia ; intertida

l to 9. 1 m(Mille

r an dLe a1972 ; Eschmeye

r et al . 1983) ; reddis h to ligh

t brow n wit h stripe s o r

darke r mottlin g (Eschmeye

r et al . 1983) . Gibbonsia montereyensis Hubb s 1927 ; crevic e kelpfish ; lengt h t o 1 5 cm ; Britis h Columbi at o Ri o Sant

o Tomas , norther

n Baj aCalifornia . 15-3 7 m . (Mille r an dLe a1972 ; Eschmeye

r et al . 1983) ; reddis h t o brow

n or lavender , plain colore dt o spotte dor

stripe d (Eschmeye

r et al . 1983) . G. erythra i s a synony m(Stepien an

dRosenblat

t 1991) .



# I I Heterostichus rostratus Girar d 1854 ; gian

t kelpfish ; lengt

h to 6 1 cm ; Britis h Columbi at o Cab o Sa

n Lucas , souther

n Baj aCalifornia , includin g Isl a Guadalupe ; intertida

l to 4 0 m(Mille

r an d Lea1972 ; Eschmeye

r et al . 1983) ; gian t kelpfish com

e i n a s man y a s thre e color

forms (red , brown , o

r green ) usually associate dwit

h th e plan t habitat s fro

mwhic h they wer

e collecte d (Stepien 1987) . I n the famil y Clinida e there ar e thre e specie s o f

kelpfishe s i

n th e genu s Gibbonsia an

d the gian t kelpfish (Heterostichus rostratus) tha t occu r alon g th e wes t

coas t o f Nort h Americ afro

mBaj at o Britis h Columbi a(Georg e an dSpringe r 1980) . Nelson (1994 ) indicate s tha t worldwid e ther e ar e thre e group s o f

clinid s wit

h about 2 0 generaan

d 7 3 species . Clinid s are small (generally <2 5 c m SL ; exceptio n H

rostratus ca . 6 0 c

mSL) , primarily demersa

l resident s of

nearshor e rock y reef s an dkel p an dseaweedbed s i

n temperat e marine water s (Lam

b an d Edgell 1986 ; Mose

r 1996) .
TENER A E9-055. 0 5-31 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 8 5.2. 9 Kelpfishe s Ther e ar e n o catch statistic s fo

r thes e specie s becaus e they ar e not commerciall y o r

recreationall y harvested . All fou r representative s o f

thi s famil y i n centra l Califomi aar

e oviparou s (Nelso n 1994) , probably spawnin g demersa

l adhesiv e egg s (Fitc h an d Lavenber g 1971 ; Mose

r 1996 ) althoug h Bane and Ban e (1971 ) repor

t stripe dkelpfis h (Gibbonsia metzi) a s havin g pelagi c eggs . Larva l form s ar e pelagi c an dar e only identifiabl e t o genu s i n th e cas e o f

Gibbonsia spp . althoug h gian t kelpfis h ca n b e identifie dt o specie s a t mos t lif e stages . Yolk-sa

c duratio n i

n thi s latter

specie s appear s t o b e 2- 3 d(Shiogak

i andDots u 1972) . Ban e and Bane (1971 ) repor t afecundit y o f aroun d 2,30 0 eggs/femal e fo

r aspotte dkelpfis h (G. elegans). Kelpfishe s o f Gibbonsia spp . first

spawn a t 2 yr , ma y spawn mor

e tha n onc e pe r year , an d liv e t o around 7 y r

(Fitc h an d Lavenber

g 1975) . Ther e i s ver y littl e demographi c informatio n relatin g t o th e earl y lif e stage s o f

clinid s i n genera l o r specificall y t o th e fou

r representative s ofth e famil y foun d i n centra l California . Growt

h o f larva l giant kelpfis h wa s estimate d b

y linea r regressio n fro

mdat ao n lab-reare d specimen s (Stepie n 1986 ) a s 0.2 5 mm/ d±0.01 3 (slop e ± 1 SE) . A simila r estimate o f

growt h rate i s no t availabl e fo

r Gibbonsia spp. , bu

t ifth e growt

h rate fo r gian t kelpfis h i s substitute d fo

r Gibbonsia, i t allow s u s t o estimate larva l age s a t entrainment

an d calculat e ETM for kelpfishes . Ther

e ar e n o availabl e dat at o indicat

e ho w wel l th e larva

l growt h rate o f gian t kelpfis h describe s th e larva l growt h of Gibbonsia spp . Therefore , usin g giant kelpfis h larva

l growt h i s considere d onl y a s a

n approximatio n t o th e growt h of Gibbonsia spp . larvae . Additionally , there are n o literature estimate s o f

earl y lif e stag e survivorshi p fo

r an y ofth e clinid s treate d here , s o FH and AEL ar e not calculate dfo

r th e clini dkelpfishes . Th e relativel y fe w identifie d larva

l gian t kelpfis h (4 2 a

t th e DCP P intak e an don e fro mth e stud

y grid ) wer

e incorporate d into th e clini d kelpfis h group fo r th e analyses . 

### 5.2.9. 1 Summar

y of Fiel d Collection s Estimate s o f

kelpfis h larva

l abundanc e a

t th e DCP P intak e structur e durin g th e year s 1996-9 9 indicate tha

t specie s i n thi s genu s ar e continuou s spawner s (Appendi x H ) exhibitin g a t leas t tw o peak s i n larva l abundanc e pe

r year . Durin g th e 1996-9 7 season , larva l abundanc e a

t th e intak e TENERA E9-055. 0 5-31 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 9 

# 1

1 1 1 i I I 

# i 5.2. 9 (Kelpfishe s M structur

e peakedi n Januar y an dagain i n June-Augus t

(Figur e 5.2.9-1) . I

n th e 1997-9 8 season , th e Januar y pea k see n i n th e previou s yea

r did not occur , an d th e late r pea k appeare d displace d w b

y about one mont h an doccurre di

n May-June . Although ther e ar e fewe r processe d subsample s fro mth e 1998-9 9 spawning season , th e peak s appea r t o confor mwit h th e patter

n fo r th e 1996
- (jj 9 7 period . Ther e wer e 9,36 1 larva

l kelpfishe s identified fro

m2,80 8 bong o net

subsample s y. collecte da t di e DCP P intak e structur e betwee n Octobe r 199 6 an d Jun e 199 9 representin g 60 % o f 

# I IE ! th e subsample s collecte dan dprocesse d fro mth e intak e structur e durin g tha t period . Jj ] Larva l kelpfishe s wer e relativel y scarc e i n di e DCP P stud y gri d (Apperada x H) , bu t th e tempora l distributio n o f

abundanc e roughl y corresponde d t o tha t observe d a t

th e DCP P intak e structure . S I Ther e wer e 46 7 kelpfis h larva e identifie d fro m21 3 bong o ne t subsample s i n stud y gri d betwee n Jul y 1997-Jun e 199 9 representin g 7 % ofth e stud y gri d subsample s collecte d an d processed . Kelpfis h larva l abundanc e wa s generall y distribute d widii n th e 2 0 misobath , an d larva e wer e likel y concentrate di n unsample darea s inshor e ofth e stud y gri d (Marliav e 1986) . Th e apparentl y highe r densit y o f

thi s specie s i n th e souther n portio n ofth e stud y gri d result s fro mth e relationshi p postulate d wit h dept h abov e an dth e fac t tha t mor e ofth e are ai n th e souther n hal f o f th e gri di s withi n th e 0-2 0 mdept h range . Standar dlength s ofth e Gibbonsia spp . larva e (7,33 1 larvae ) measure d fromsubsample s a t di e DCP P intak e structur e betwee n Octobe r 199 6 an dJun e 199 9 range d fro maminimu mo f 2. 4 m m t o amaximu mo f

2 3 m m(Fignar e S.2.9-3) . Th e minimu man d maximu mlengths , 4. 1 m man d1 2 mm , fro mth e centra l 98 % o f thi s length-frequenc y distributio n wer e use d i n calculatin g larva l duration . A larva l growt h rat e fro mgian t kelpfis h o f

0.2 5 mm/ d (Stepie n 1986 ) wa s applie d t o th e rang e o f length s t o estimat e th e age s ofth e entraine dlarvae . Th e mea n larva l lengt h i n thi s distributio n wa s 6. 4 m ma t approximatel y 9 do f

age . W e assume d tha t

larva e shorte r

tha n th e minimu mlengt h ofth e centra l 98 % ofth e distributio n wer e jus t hatche d an d age d zer o days . Subsequen t

age s wer e estimate d fro mthi s lengt h an dup . Othe r reporte d dat afo r

thi s specie s suggest s tha t

hatchin g lengt h i s approximatel y 4. 5 m m(Mose r 1996) , indicatin g tha t

th e smalles t larva e observe drepresen t eithe r natura l variatio n i n hatc h length s withi n th e populatio n o r th e phenomeno n o f

shrinkag e followin g preservatio n (Theilacke r 1980) . Th e possibilit y remain s dia t TENER A E9-055. 0 5-32 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 0 5.2. 9 Kelpfishe s all larva e fro mth e observe dminimu

mlengt h o f 2. 4 m mt o th e greates t

reporte d hatchin g lengt

h o f 4. 5 m m(Mose r 1996 ) coul dhav e jus t

hatched , leadin g t o overestimatio n o f age s fo r all larva e <4. 5 mm . Distribution s o f

Gibbonsia spp . larva

l length s a t th e DCP P intak e structur e an d i n th e stud y gri d (Figure 5.2.9-4 ) wer

e compare dusin g aKolmogorov-Smirno v test . Th e tes t detecte d a significan t differenc e between th e tw o distribution s ( p <, 0.001) . Th e length-frequenc y distribution s i

n bot h sampiin g location s wer

e unimodal , wit

h afe w large r individuals . A t-test

di d no t detec t asignifican

t differenc e ( p > 0.786 ) between mea n length s a

t th e DCP P intak e and i n th e stud y grid . Th e estimate dag e fo r a n averag e lengt

h larv awa s about

9 d . Thes e dat aindicat

e dia t entraine dlarvae wer

e ver y youn g an

d tha t difference s between ag e an d lengt h ofth e populatio n entraine dandth e populatio n a t ris k are ver y small . 

### 5.2.9. 2 Estimatin g Tota l Annua l Entrainmen t There wa s considerabl e variatio n o f annua l estimate d mea

n entrainment

o f larva l kelpfishe s amon g year s (Tabl e 5.2.9-1) . Approximately 186,000,00 0 (SE =4,740,000 ) kelpfis h larvae wer e entraine di

n Analysi s Perio d1 whil e entrainment estimate s range d fro

m83,600,00 0 (SE =4,150,000 ) t o 124,000,0 0 (SE =5,000,000 ) between th e tw o analysi s period s i n th e 1997
- 9 8 samplin g season . All period s appeare d t o b e differen t fro mone anodie

r becaus e 95 % confidenc e interval s approximate db y 2 • SE(E T

) di d no t overlap . Annua l estimate s ofth e numbe

r o f kelpfish larva

e entrained , adjusted t o th e nin e yea r averag e estimate dfro

mIntake Cov e surfac e plankto n to w samplin g (Figur e 5.2.9-5) , wer e 181,000,00 0 ( SE =4,610,000 ) fo

r Analysi s Perio d 1 an

d 308,000,00 0 ( S

E = 15,300,000 ) fo

r Analysi s Perio d 2 (Tabl e 5.2.9-2) . Th e adjustmen t inde x (III,) wa s calculate d a s th e rati o betwee n th e averag e ( 7 ) o f Intake Cov e andth e averag e annua l index estimate d fro

mthes e sam

e tow s durin g th e yea

r bein g adjuste d(/,) . The averag e inde x fo r 199 7 an d 199 8 (/, ) wa s 0.068 2 an

d 0.018 1 larvae/m 3 , respectively , whil e th e long-ter maverag e inde

x ( 7 ) i s 0.0664 larvae/m 3 fo r th e year s 1990
- 1998 , yieldin g arati o Til, o f 0.97 4 fo r 1997 an d 3.6 8 fo r 1998 . Th e adjusted estimate fo r th e 1997-199 8 perio di s large

r tha n th e unadjusted entrainment estimate , an

d wa s significantly TENERA E9-055. 0 5-32 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 1 5.2. 9 Kelpfishe s greate r tha n th e 1996-199 7 adjusted estimat e becaus e 95 % confidenc e interval s approximate d b y 2 • SE(EAdj-T) di dnot

overlap . NOTE : FH

and AEL estimate s wer

e not calculate d fro

mth e estimate s o f

entrainmen

t fo r kelpfishe s becaus e ther

e wer e no demographi c dataavailabl e t o parameteriz e thes e models . 

### 5.2.9. 3 Empirica l Transpor t Mode l (ETM) Monthly estimate s o f

proportiona

l entrainmen

t (PE,) fo r kelpfishe s fro

mth e survey s durin g th e tw o year s sample drange dfro maminimu

mo f 0.00144±0.0015 6 (±\SE(PE,)) i n Marc h 199 8 t o amaximu mo f 0.346±0.18 9 i

n Ma y 199 8 (Tabl e 5.2.9-3) . Ther e wer e othe r month s whe

n the / wa s large r tha n th e valu e fo

r Ma y 1998 , whic

h would caus e th e PE, durin g tha t mont h to contribute mor

e t o th e tota

l P M valu e calculate d fo

r th e ETM. Ther

e wer e n o period s whe

n PE, an dfjwer e bot h equa l t o zero indicatin g tha

t larva e wer e alway s present

durin g th e pasire d entrainment

an d72-hou r stud y gri d surveys . Kelpfish larva

e fro mth e stud

y grid subsample s wer

e primarily distribute d i

n nearshor e area s (Figur e 5.2.9-2 ) an

dsimila r t o reporte d adult

distribution s (Mille

r an d Le a1972) . Therefore , P s wa s calculate dusin g only alongshor e curren t movemen t an d no t b y extrapolatin g stud

y gri d abundanc e offshore . The larg e difference s i n estimate d age s o f

larva l kelpfish a

t entrainmen

t ( 9 vs . 3 1 d ) ca

n affect calculatio n o f

P M (Figur e 5.2.9-6) . A s expected , value s fo r P M wer e les s fo r shorte r larva l duration s becaus e ofth e reduced perio d o f larva l transport . Estimate s o f

P M fo r either larva l duratio n ar

e relatively simila

r within a n analysi s perio d fo

r agive n duratio n 

### 5.2.9. 4 Interpretatio n of Assessmen t Result s Kelpfish d o no t

hav e an y commercia

l o r recreationa

l fishery value , an

d there i s littl e information o n thei r ecologica l rol e i n th e community . Becaus e ofth e limited fishery harves t datafo r thes e specie s (ca . 0.1 4 M

T a t Por t Sa n Lui s i n 1990) , entrainmen

t mortalit y rate s (P

M ) could not

b e compare dto harvests . Additionally , ther e ar e n o estimate s o f

populatio n siz e o

r adul t densit y tha t couldb e use

dto conver

t P M int o a n estimat e o f adul t equivalen t loss . Annua

l mea n densit y o f
TENER A E9-055. 0 5-32 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.4 2 5.2. 9 Kelpfishe s kelpfis h larvae fro

m Intake Cov e surfac e plankto n tow s show s considerabl e variatio n in abundance relativ e t o th e long-term mea n fo r th e perio d 1995-199 8 (Figur e 5.2.9-5) . Abundanc e ofth e loca l adultkelpfis h populatio n appear s t o declin e fro

m 1993-199 8 (Figur e 5.2.9-7) . Result s ofth e ETMshow tha tth e powe r plantmay annuall y entrain approximatel y 40 % ofth e kelpfis h larvae ove r a

n area si x t o seve n time s th e area ofth e stud y gri d (Figur e 5.2.9-6) . Th e lengt h frequency distributio n o f entraine d larvae show s a wid e range o f lengths , indicatin g tha

t th e larvae ar

e subjec tt o entrainmentfo r a longe r duration tha n othe r nearshore taxa . (Figur e 5.2.9-3) . I f

Moser' s (1996 ) estimat e o f siz e a tflexio n fo r spotte d kelpfis h Gibbonsia elegans i s use d fo r comparison , the n th e lengt h frequency dat

a indicate s tha

tpost-flexio n larvae ar

e als o bein g entrained . Althoug h P M fo r kelpfishe s i s likel y t o b e overestimate d becaus e o f gri d samplin g tha

ti s biase d fo r nearshore taxa , th e relativel y hig h probabilit y o f entrainmentb y th e powe r plantintake a s wel l a s additional evidenc e o f decline s in loca l adul tan d larva l abundance indicate a hig h likelihoo d fo r loca l impacts o n thi s taxon . Additionally , loca l habita tfo r kelpfishe s (th e rocky habita tbetwee n PointBucho n an d Poin tSa

n Luis ) i s bordered t o th e nort h an d sout h b y larg e expanse s o f

sand y beach tha

td o notfavo r adul tkelpfishe s an d may impl y a geographicall y constraine d subpopulation . However , th e exten to f larva l duration estimate d fro

m ou r dat a indicate s tha

tkelpfis h larvae coul d b e transported sufficien tdistance s t o connec tth e loca l rocky habita

tt o areas nort

h an d sout h ofth e headland s mentione d above . Th e mos tcommo n membe r o f

thi s genu s foun d locall y a s a n adult , crevic e kelpfis h (Gibbonsia montereyensis), i s distribute d fro

m Britis h Columbi a t o Baj a California , makin g i tunlikel y tha

tloca l impacts coul d affec tth e larger population .

TENER A E9-055. 0 5-32 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 3 5.2. 9 Kelpfishe s
Tabl e 5.2.9-1 . Estimate d tota l annua l entrainmen t (E T ) an d standar d erro r ( SE(E T ) ) for

kelpfis h larva e fro mth e thre e analysi s periods . Analysi s Perio d E r SE(E T

) 1 ) Oc t 23 , 1996-Se p 30 , 199 7 186,000,00 0 4,740,00 0 2 ) Oc t 1,1997-Se p 30 , 199 8 83,600,00 0 4,150,00 0 3 ) Ju l 1,1997-Ju n 30 , 199 8 124,000,00 0 5,000,00 0

Tabl e 5.2.9-2 . Estimate d tota l annua l adjuste d entrainmen t (E Adj

_ T ) an d standar d erro r

( SE(E MJ

_ T ) ) fo r kelpfis h larva e fro mth e thre e analysi s periods . Analysi s Perio dE Adj

_ T SP(E Mj

_ T ) 1 ) Oc t 23 , 1996-Se p 30 , 199 7 181,000,00 0 4,610,00 0 .2 ) Oc t 1 , 1997-Se p 30 , 199 8 308,000,00 0 15,300,00 0 3 ) Ju l 1,1997-Ju n 30 , 199 8 458,000,00 0 18,400,00 0

TENER A E9-055. 0 5-32 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 4 5.2. 9 Kelpfishe s
Tabl e 5.2.9-3 . Kelpfishes : Monthl y estimate s o f

proportiona

l entrainmen

t (PE, ) an d annua l proportio n o f

larva e hatche d i

n th e hh survey perio d (fj) an d associate d standar

d error s (SE) use

d i n estimatin g entrainment mortalit y fo r tw o analysi s periods .
a ) Analysi s Perio d 3 : Jul y 1 , 1997-Jun e 30 , 199 8 Survey Star

t Dat e PP SE(PE,) 

## f SP(f) Ju l 21 , 199 7 Au g 25 , 199 7 Se p 29 , 199 7 Oc t 20 , 199 7 No v 17 , 199 7 De c 10 , 199 7 Ja n 22 , 199 8 Fe b 26,199 8 Ma r 18 , 199 8 Ap r 15 , 199 8 Ma y 18 , 199 8 Ju n 8 , 199 8 0.034 7

0.25 0 0.029 8 0.035 7 0.023 9 0.016 0 0.0083 6 0.014 8 0.0014 4 0.16 8 0.34 6 0.21 6 0.014 6

0.12 2 0.02 2 0.018 1 0.011 7 0.0076 2 0.0029 1 0.0047 3 0.0015 6 0.11 4 0.18 9 0.12 2 0.22 4

0.17 2 0.066 8 0.032 9 0.030 7 0.020 6 0.046 6 0.022 9 0.0094 8 0.046 8 0.081 5 0.24 6 0.0063 5

0.0047 1 0.0044 7 0.0016 2 0.0015 5 0.0011 6 0.0019 4 0.0010 0 0.00085 0 0.0017 7 0.0037 2 0.0086 3 b ) Analysi s Perio d 4 : Jul y 1 , 1998-Jun e 30 , 199 9 Survey Star

t Dat e PE, SE(PE,) 

### fi 

### SP(f) Ju l 21 , Au g 26 , Se p 16 , Oc t 6 , No v 11 , De c 9 , Ja n 12 , Fe b 3 , Ma r 17 , Ap r 14 , Ma y 24 , Ju n 23 , 199 8 199 8 199 8 199 8 199 8 199 8 199 9 199 9 199 9 199 9 199 9 199 9 0.15 2

0.16 8 0.041 7 0.061 2 0.11 6 0.038 9 0.013 7 0.080 2 0.013 1 0.19 0 0.24 0 0.27 7 0.10 4

0.093 7 0.017 4 0.024 1 0.041 2 0.0076 2 0.0029 3 0.033 1 0.0059 2 0.094 0 0.11 3 0.14 9 0.084 7

0.053 2 0.028 6 0.056 0 0.12 9 0.18 3 0.094 6 0.10 3 0.035 1 0.076 2 0.098 9 0.058 0 0.0033 6

0.0027 0 0.0019 9 0.0025 9 0.0028 3 0.0042 6 0.0025 3 0.0028 6 0.0014 0 0.0020 0 0.0028 8 0.0024 0

TENER A E9-055. 0 5-32 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0fl""' 7 P.4 5
5.2. 9 Kelpfishe s

u i ai E

C O c C D o c C D C D Kelpfishe s

Surve y Oat e T designatessurveywithdensity= 0

Figur e 5.2.9-1 . Weekl y mea n larva l density (#/m 3 + 1 S.E. ) a tth e DCP

P intake .

TENER A E9-055. 0 5-32 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0m

2 m m C O o U l Ut b

3

c o

g-c p

-- Vt m+ N > Q > o ca- . o o O 3 Kelpfishe s

c n327 C

O 

# E * 0.8

4 0.7 0 0.56 0.4 2 0.28 0.1 4 0.0 0

Dept h Contour s 2 0 melee s mmmmm 4 0 metef S mmmm 6 0 meter s Poin t Bucho n
DCP P Intak

e

Poin t Sa n Lui s

Jul
. 21,'9 7 Aug
. 25 , '9 7 Sep
. 29,'9 7 Oct
. 20,'9 7 Nov
. 17,'9 7 Dec
. 10,'9 7 

### Figur e 5.2.9-2a . Mea

n larva l densit y (#/m 3 

### ) collectedi

n the DCP P stud y gridcell s an

da t the entrainmen

t sampling location . U l i o i o 2
. T J zn Vt ZT. C D C O

J* *

0 )m

z m m C D • o c n m



## vc o r o o o

3 C U C O C D 

## § 1 t o C U o t* . o o O 3 Kelpfishe s

C O 

# E 0.8 4 0.7 0 0.5 6 0.4 2 0.2 8 0.1 4 0.0 0

Dept h Contour

s i n 2 0 meter

s ----m 4 0 meter s •^•• TM 6 0 meter s Poin t Bucho n

DCP P Intak e

Poin t Sa n Lui s

Jan
. 22,'9 8 Feb
. 26 , '9 8 Mar
. 18 , '9 8 Apr
. 15,'9 8 Ma y 18,'9 8 Jun
. 8 , 9 8 Figur e 5.2.9-2 b (continued) . Mean larva l densit y (tf/m 1 ) collecte d in th e DCP P study gri d cell s an d a t th e entrainmen t

samplin g location . c n r o c o
C D
Vt ZT C D Vt

tr

^ 1H

m z m r n C O o U l U l

c o M C O

T l 5 ' co _ c o at 

# § 1

^ • * r o S O mt o o o 3 Kelpfishe s

c o 0.8 4

0.7 0 0.5 6 0.4 2 0.2 8 0.1 4 0.0 0

Dept h Contour s

— —2 0 meter s
• —4 0 meter s —mm 6 0 meter s Poin t Bucho n

DCP P Intak e

Poin t Sa n Lui s

Jul
. 20.'9 8 Aug
. 25.'9 8 Sep
. 15.'9 8 Oct
. 5 , "9 8 No v10,'9 8 Dec
. 8,'9 8 

### Figur e 5.2.9-2c (continued) . Mea n larva l densit y (#/m 3 

### ) collectedi

n the DCP P stud y gri dcell s an

da t th e entrainmen

t samplin g location . c n r o C O 2
. • o vt C D Vt


### | 5m

z m m C O i o c n u i

V C O C O o

3 0 1 co at 

# M
r o S o a : o o o 3 Kelpfishe s

C O 

# E 0.8 4

0.7 0 0.5 6 0.42 0.2 8 0.1 4 0.0 0

Dept h Contour

s

— —2 0 meter s
• —4 0 meter s •^•^

—6 0 meter s Poin t Bucho n
DCP P Intak

e

Poin t San Lui s

Jan
. 11,'9 9 Feb
. 2 , '9 9 Mar
. 16,'9 9 Apr
. 13,'9 9 Ma y 23,'9 9 Ju n 22,'9 9 Figur e 5.2.9-2 d (continued) . Mean larva l densit y (#/m 3 ) collecte d i n th e DCP P study gri d cell s an da t th e entrainmen t

samplin g location . c n ro c o 2
. • o 3 1 C A •T C D VtP.5 0 5.2. 9 Kelpfishe s

Kelpfishe s N = 7,33 1 1 5 —

-

-ofOccurrence0III IIII IIFrequencyIIIIIIPercentIIIIII

_ M i n Madi a 1 * %



# j l
O | . . . | . . . | .

2. 2 3. 2 4. 2 S. 2

C n Mea n 9 9 %

.



# I 

# I llllllll.ll..-. . I L . 6. 2 7. 2 6. 2 9. 2 10. 2 11. 2 V 3 M a x

^ Lengt h Categor

y (mm )

• • • i • • • i • • i • • • i • • • i i • • • • • M I * ) A a 1 2 1 6 2 0 ZA 2 8 •*••*&- » Estimate d age (days

) Figur e 5.2.9-3 . Lengt

h frequency o f

all measure d larva

l fis h collecte d i

n th e entrainmen

t samples . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva

l length s ar

e noted . X-axi s scal e i s no t

continuou s a

t large r lengths .

TENERA E9-055. 0 5-33 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0 

# I I 1 I I I I 

# I I I I I 1 1 I I I 1 IP.5 1
5.2. 9 Kelpfishe s Kelpfishe s

15 -

- Mi n

10 "

o c 5- I C D 3 O O O 1 % Entrainment : N=61 2 Median l Mea n

3. 3 4. 5
> . " 15 - c C D 3 c r I V L. 1 0 ~ c C D C J Mi n 1 % 99 % Ma x

P*P^T* ^ 

# 4
10. 8 *»*.%

ledia n Grid : N=31 1 Mea n 99 %

3. 3 4. 5 5. 8 

# lllllll— Ma x 

# i
7. 0 8. 3 9. 5 10. 8 *-*\% Lengt h Categor

y (mm )
Figure 5.2.9-4 . Lengt

h frequency o f

measure d fish fro

mentrainmen

t survey s tha

t paire d wit h gri dsurvey s (bot

h year s combined) . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva l length s ar

e noted . X-axi s scal e i s no

t continuou s a

t large r lengths . TENER A E9-055. 0 5-33 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.5 2 5.2. 9 Kelpfishe s

^^S.E-/+MeanDensity(#/m3 0.2 4 — 0.2 2 - E 0.2 0 — 0.18- E 0.1 6 — 0.1 4 - Z 0.1 2 -. o.io- r 0.08 ^ 0.06- E 0.04- E 0.02- E o.o o —

- Kelpfishe s

i i i 199 0 199 1 199 2 

### I

I 199 3 i

1994 Yea r 

# - I

i 199 5 

## I

I 199 6 

# I 1

I 199 7 i

I 199 8

Figur e 5.2.9-5 . Annua

l mea n densit y +/
- 2 standar

d error s (vertica

l lines ) an d grand mea

n densit y fo r all year s combine d(horizonta l line ) fo r th e Intak e Cove surfac e plankto n tows . The annua l mea n densitie s are base do

n seven consecutiv e month s o f dat a(Decembe

r throug h June ) excep t fo r 1990 , which ha

donly five month s (Februar y through June) .

TENERA E9-055. 0 5-33 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 3
5.2. 9 Kelpfishe s

1.20 - i.o e - o.ee O.C*4 ~ 0.72 - £ o.e o — 0.4 8 — 0.3 « — 0.2. 4 —
o.oo P a alongshor e

! \ \ \ \ \ \ \
t t 1 \ \ \ \ V 1 \ * \ 1 • \ 1 \ 1 ^^^ 

### V ! 

## \ l

i . i —i—•—i—i—i—i—i—i — Kelpfishe s - mea n duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

^.Pu- 0.31 8 Estimat e 90 % C.l
.

"~~~~~---
_ —i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—T—i—i—r-i—i—i—'— r O x O k m S x .

8 7 k m lO x

1*7 4 k m -IS x

2B 1 k m 20 x

34 7 k m 2S x

43 4 k m SO x

S2 1 k m 3S x

BO S k m 40 x

e s s k m S U > o f Populatio n Relativ e t o Stud y Oli d Equivalen t Dlatanc a Alongshor e Kelpfishe s - mea n duratio n

Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

90 % C.l
.

Siz e o f Populatio n Relativ e ti o Stud y Qrl d Equivalen t Diatano e Alongshor o Figure 5.2.9-6a . Tota

l annua l entrainmen

t mortalit y (\\) and 90 % confidenc e interva l (CL ) a s afunction o f

di e reciproca

l o f di e fraction o f

di e populatio n a

t ris k and containe d in di e stud

y gri d (ft.) use dt o approximat

e di e alongshor

e exten t o f di e stud y gri d populatio n expande d o n di e basi s o f alongshor e current movement s widi th e 90 % CI . indicated .

TENERA E9-055. 0 W3 4 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.5 4
5.2. 9 Kelpfishe s Kelpfishe s - maximu m duratio n 1.2 0 1.08 - o.se - O.B4 - 0.72 - J | o.e o — 0.4 B — 0.3 6 0.24 - 0.1 2 o.o o — \

\ \ 1 ^ : 

## J 

## l \ i \ * \ 

## l \ i \ i \ 

## 1 \ i \ 

# ! V

i i r i | i • r &m

alon g *»t">or*

>
• * I 1 N . 1 v ! V 1 •N
. | v ; > . 1 ^x ^ ^** l —-

—1—1—1—1—1—1—1—1—1—1 — Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

^P* * = 0.41 0

r—i—i— r i—i—i— r ' - Estimat e 90 % C.l .

"""•"-- -

-i—i—i—i—i—i—i—i—i—i—i—i—i—r 1 O x O k m S x

B 7 k m lO x

1 7 4 k m I S x

2S 1 k m 2 O x

3 4 7 k m 28 X

4 3 4 k m SO x

S2 1 k m S S x

eo e k m 40 x

SS S k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alonaanor e Kelpfishe s - maximu m duratio n

Analysi s Perio

d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % C.l .

Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alongahor e Figur e 5.2.9-6b . Tota

l annua l entrainmentmortalit

y (P^) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal o f di e fraction o f

di e populatio n a

tris k an d containe d i n di e stud y gri d (j> s ) use d t o approximat

e di e alongshor e exten to f di e study gri d populatio n expande d o n th e basi s o f alongshor e curren

tmovement s wid i di e 90 % CI . indicated .

TENER A E9-055. 0 W3 5 Fina l 316(b ) Demonstratio n Marc h 1.200 0

# IT " P.5 5 5.2. 9 Kelpfishe s

o ta C O c c o B "53 E I o I O

• * c C O V E 

### Fig u r e 5.2.9-7 . Mea

n numbe r o f kelpfishe s observe d pe

r 50-mete r subtida l transec t i n th e DCP P RWM P Sout h Control area . Splin

e smoothing algorith

muse d t o dra w the curve throug

h the points .

TENER A E9-055. 0 5-33 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 6



# Blan k Pag e5.2.1 0 Blackey e Gob y



### 5.2.10 Assessment

of Blackeye

Goby (Coryphopterus

nicholsi)

Coryphopterus nicholsi (Bea n 1882) ; blackey e goby ; lengt h t o 1 5 cm ; norther

n Britis h Columbi ato sout

h o f PuntaRompiente , centra

l Baj aCalifornia ; intertida l t o 10 6 m ; pal e ta

n wid i som e brow n or greenis h speckling ; small blu e do t belo w ey e (Mille

r an d Le a1972 ; Eschmeye

r et al . 1983) . The Gobiida

e i s th e mos t

specios e famil

y o f marine fishe s wit

h 1,875 specie s i

n 21 2 genera occurrin g worldwide i

n temperat e to tropica

l climate s an

d i n arang e o f

habitat s fro

mfreshwate

r t o brackis h an

dmarin e environment s (Brother s 1975 ; Nelso n 1994) . Abou t 2 1 specie s an

d 1 6 generaoccu

r i n th e CalCOF

I stud y are afro mth e Oregon-Californi aborde r t o sout h o f Cab o Sa n Lucas , Baj aCaliforni aSur , Mexic o (Mose r 1996) . Adult

blackey e goby (Coryphopterus nicholsi) i s common i

n benthi c nearshor

e marine environment s i

n th e vicinit

y o f Diabl o Canyon , generally a t th e rock-sandinterfac e (Teneraunpubl . data ; Mille r an d Le a1972 ; Love 1996) . Th e early lif e histor y o f blackey e goby i s simila

r t o othe r member s ofth e famil

y Gobiidae . Female s ar

e oviparous , layin g demersal , adhesiv e egg s unde r rock s tha t th e male s guar

d unti l planktoni c larva

e hatch (Lov e 1996 ; Mose

r 1996) . Nest s containin g egg s ar e foun d fro mApril to Augus t i n souther n Californi a(Wiley 1973) . Larva e ar e reporte d to hatch a

t 2.8- 3 m m(Mose r 1996) , wit h planktoni c duration s o f

approximately 7 5 d (Steel e 1997) . Larva l transformatio n occur s a t 16-2 5 m m(Mose r 1996) , whic

h i s within th e rang e o f

length s a t settlemen t (15-2 9 mm

) reporte db

y Steel e (1997) . Blackey e goby demonstrat e protogynou s hermaphroditis m(Col e 1983 ; Breitbur g 1987 ; Col e an

d Shapir o 1992) , wit

h all animal s beginnin g lif

e a s female s an

dtransformin g to male s a

t around 6-7. 5 c

m(Lov e 1996) . The

y liv e approximately 5 yr

an dmatur e aroun d 0. 5 yr a t approximately 4. 5 c

m(Steel e 1997) . Spawning occur s year-round , peakin g betwee n Februar y an d Octobe r (Matares e e

t al . 1989 ; Mose

r 1996) . Female s ma

y spaw n severa l time s pe r yea r wit h fecundit y estimate s rangin g i

n souther n

TENER A E9-055. 0 5-33 7 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.5 8 5.2.1 0 Blackey e Gob y Californi afro

m1,70 0 eggs/nes t

(Eber t and Turner

1962 ) t o 3,274-4,78 8 egg s i n Orang e Count

y (Wile y 1973) . Whil e th e siz e a

t ag e fo r post-larva

l blackey e gob y ha s bee

n describe d (Wiley 1973) , siz e a t ag e fo r th e larvae estimate dfromplanktoni c duratio n and siz e at settlement

ar e 2- 3 m o an

d 15-2 9 mm , respectivel y (Steel e 1997) . Additionally , larva l growtii ha s been characterize d fo r dire e gobii dspecie s (arro w goby : Clevelandia ios; cheekspo t goby : Ilypnus gilberti; shado w goby : Quietula y-cauda) fromMissio n Bay , Californi a(Brodier s 1975) . Brother s (1975 ) describe d th e growt h coefficien

t o f C . ios usin g th e VBG

F a s k=0.9 6 (L. = 3 6 mm) , tha t of I. gilberti a s k=0.1 8 (L«, = 6 0 mm) , an

dtha t o f Q. y-cauda a s k=0.1 6 (L„ = 7 0 mm) . N o species-specifi c larva

l survivorshi p estimate s hav e been reporte d fo r blackey e goby . However , Brodier s (1975 ) calculate d larva l mortalit y up t o settlement

(t o ag e 0 yr ) fo

r th e dire e sympatri c gobiid s (arro w goby , cheekspo t goby , and shado w goby ) fromMissio n Bay , Californi a (Tabl e 5.2-10-1) . Thes e estimate s wer e used t o approximat

e blackey e gob y mortalit

y fo r earl y lif e stage s a s wel l a s pos t

settlement

juvenil e and adul t

stages . Substitutin g th e survivorshi p informatio n fo

r dies e closely-relate d specie s into th e assessment mediod s allowe d u s t o estimate th e number

o f los t spawnin g female s usin g FH and t o projec t losse s into th e futur

e a s equivalent adults , usin g AEL. 

### 5.2.10. 1 Summar

y o f Fiel d Collection s Blackey e gob y larva

e wer e collecte d almos t

yea r round a t di e DCP P intak e structure durin g th e year s 1996-199 9 (Appendix H) , wit h thei r highes t densitie s occurrin g primaril y betwee n Ma y an dSeptembe

r (Figur e 5.2.10-1) . Blackey e gob y larva e wer e mor e abundan t i n 1997 tha

n i n 1998 . Thi s migh

t hav e been du e t o th e E

l Nin o even

t tha t bega n durin g th e sprin g o f

1997 (Lyn

n e t al . 1998 ; NOA

A 1999) . There were 7,65 8 larva l blackey e gob y identifie d fro m1,11 9 bong o ne t subsample s collecte da

t th e DCP P intak e structur e between Octobe

r 199 6 an d Jun e 199 9 representin g 24 % ofth e subsample s processe d fro mtha t locatio n durin g tha

t period .

TENERA E9-055. 0 5-33 8 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.5 9 5.2.1 0 Blackey

e Gob y Larva l blackey e gob y occurre di

n th e DCP P stud y gri d durin g mos t

month s excep t

betwee n Februar y an dMarch (Appendi

x H) , wit h thei r highes t densit y occurrin g durin g Jul y 1997 (Figure 5.2.10-2) . Blackey e goby larva e wer e disperse d diroughout

th e stud y grid . However , durin g som

e month s (e.g. , Octobe

r an d Novembe

r 1997 , Marc

h 1999 ) blackey e gob y larva e wer e abundan t a t th e DCP P intake , but

i n low abundanc e i

n th e stud y grid . Ther

e wer e 1,25 5 larva

l blackey e gobie s identifiedfrom50 5 bong o net subsample s representin g 16 % ofth e stud y grid subsample s collecte dan

dprocesse d fro

mJul y 1997-Jun e 1999 . Standar dlength s o f

al l blackey e gob y larva

e collecte d a

t th e DCP P intak e structure between Octobe r 199 6 an dJun e 199 9 range d fro

maminimu

mo f 1. 5 m mt o amaximu

mo f 5. 1 m m (Figur e 5.2.10-3) . Th e growt h rate o f larva l blackey e gob y (0.2 7 mm-d' 1 ) reporte d b y Steel e (1997 ) wa s usedt o estimat e larva l ages . Examinin g th e centra l 98 % o f thi s length-frequenc y distributio n resulte di

n minimu man d maximu mlength s fo

r di e analyse s o f

2 m man d 3. 4 mm , respectively . The mea

n larva l lengt h i n thi s distributio n wa s 2. 6 m man d wa s estimate d t o b e approximatel y 2 d old . W

e assumed tha

t larva e shorte r tha n th e minimu

mlengt h ofth e centra

l 98 % ofth e distributio n wer e jus t hatche d an

d assigne d a

n ag e o f 0 d . Reporte d hatchin g siz e rang e fo r thi s specie s i s 2.8-3. 0 m

m(Mose r 1996 ) however , indicatin g tha t th e smalles t

larva e observe da

t DCP P represente deither

natura l variatio n i

n hatch length s withi n th e populatio n or th e phenomeno n o f

shrinkag e followin g preservatio n (Theilacke r 1980) . Ifth e observe d length s are th e resul t

o f natura l variatio n i

n hatchin g lengths , then th e possibilit y exist s tha

t al l larva e fro mth e observe dminimu

mlengt h o f 1. 5 m mt o th e greates t

reporte d hatchin g lengt

h o f 3. 0 m m (Mose r 1996 ) coul dhav e jus t

hatche d (aged- 0 d) , leadin g to overestimatio n o f age s fo r all larva e <3. 0 mm . Th e averag e estimate dag e a t entrainment

o f ca . 2 dfo r blackey e goby larva

e indicate d tha t th e powe r plan t entrain s relativel y youn g larvae . Ther e wer e significan

t difference s betwee

n mea n length s (Mest : p < 0.001 ) an d betwee n length
frequency distribution s (Kolmogorov-Smirno v test : p < 0.037 ) o f larva l blackey e goby fro

mth e DCP P intak e structur e an dstud y gri d despit

e th e apparen

t similarit y betwee n th e tw o distribution s (Figure 5.2.10-4) . Th e mea n standar d length s fro

mth e intak

e an d stud y gri d wer e 2. 6 m man d2. 8 mm , respectively . The disparit y betwee n sample size s (69 9 larva

e fro mth e intak

e TENER A E9-055. 0 5-33 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 0 5.2.1 0 Blackeye Gob

y

an d 14 4 larvae fro

mth e stud

y grid ) ma y caus e th e t-test

t o b e overly sensitiv e t o slight difference s between th e mean s (Za r 1984) . Whil e thes e difference s wer e statisticall y detectabl e an d significant

usin g th e t-test

an dK- S test , w e believ e di e biologica l significanc e o f

thes e difference s wa s probabl y low . 

### 5.2.10. 2 Estimatin g Tota l Annua l Entrainmen t Th e annua l estimate dmea

n entrainment

o f larva l blackey e gobie s fo

r th e 1996-9 7 Analysi s Perio d1 (E~ T

= 138,000,00 0 ;SE

=14,100,000 ) an

d 1997-9 8 Analysi s Perio d 2 ( E ^= 133,000,00 0 ; SE=13,300,000) wer e extremel y clos e i

n valu e (Tabl e 5.2.10-2) . Th e estimate fo

r Analysi s Perio d3 differ s fromth e other estimate fo

r 1997-98 , Analysi s Perio d 2 , becaus e larva

l blackey e gobie s wer

e collecte d diroughout

di e year , includin g th e tim e perio d tha t doe s overla

p between di e tw o period s (Figur e 5.2.10-1) . Value s o f ± 2 SE(E T

) ca n b e used t o approximat

e 95 % confidenc e interval s aroun d di e point estimates . Thes e approximate confidenc e interval s overlapped , indicatin g tha t di e apparent

difference s betwee

n the mwer e probabl y no t statisticall y significant . Annua l estimate s ofth e numbe

r o f entraine d blackey e gob y larvae , adjuste d t o di e nin e yea r averag e estimate dfro

mIntake Cov e surfac e plankto n to w samplin g (Figure 5.2.10-5) , wer e 128,000,00 0 (SE= 13,100,000) fo r Analysi s Perio d 1 an

d 109,000,00 0 (SE= 10,900,000 ) fo r Analysi s Perio d2 (Tabl e 5.2.10-3) . Th e adjustmen t index (111,) wa s calculate d a s th e rati o betwee n th e nin e yea

r averag e ( /

) o f Intak e Cov e plankto n sample s an d di e averag e annua

l index estimate dfro

mthes e same tow s durin g th e yea r bein g adjusted (/,) . Th e averag e inde x fo r th e year s 1997 and199 8 ( I, ) are 0.018 1 an d 0.020 6 larvae/m 3 , respectively , whil e th e long-ter m averag e index (7 ) i s 0.016 8 larvae/m 3 fo r th e year s 1990-1998 , yieldin g th e rati o III, = 0.92 5 fo r 199 7 and0.81 6 fo

r 1998 . Th e confidenc e intervals , estimate d from±2-SE(E AdJ

_ T ), aroun d th e adjuste dentrainment

abundanc e overlap , indicatin g tha t th e difference s between th e estimate s ar e probabl y no t

statisticall y significant .

TENER A E9-055. 0 5-34 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 1 5.2.1 0 Blackey

e Gob y 

### 5.2.10. 3 Fecundit

y Hindcastin g (FH) Larva l mortalit y rate s wer

e not availabl e fo

r blackey e goby , bu

t Brother s (1975 ) indicate s tha t 99 % mortalit

y ove r tw o month s is*reasonabl

e fo r low fecundit

y gobies . Finit

e survivorship fo

r blackey e goby larva

e wa s estimate d a s 0.926-d' 1 fro mBrother s (1975 ) who examine d thre e sympatri c goby specie s (arrow , cheekspot , an d shado w goby) . Averag e ag e a t entrainmen

t o f blackey e gobie s a

t DCP P wa s estimate d a s 2.1 2 d , calculate d usin g minimu msiz e ofth e centra

l 98 % distributio n ( 2 mm) , mea n siz e a t entrainmen

t (2. 6 mm) , an

d agrowt h rat e o f 0.27 mm-d' 1 (Steel e 1997) . Surviva

l t o entrainmen

t i s then estimate d a s 0.926 2 n = 0.850 . Lifetim e fecundit y ( TLF ) i s calculate dusin g alongevit y o f 3. 6 yr estimate d fromth e von Bertalanff y growt h functio n (VBGF ; Ricke

r 1975 ) describe d below , a

n ag e a t firs t maturatio n o f

0. 5 y r (Steel e 1997) , an d a n estimate dannua

l fecundit y o f 8,06 2 egg s ( 2 batche s o f

4,03 1 annually ; Wile

y 1973) . The VBG F wa s usedt o estimate longevit y o f female s a t thei r transformatio n lengt

h fromfemal e t o male . Steele'(1997 ) indicate s tha t blackey e gobie s matur

e a t 0. 5 yr (ca . 4. 5 cm) , an

d Lov e (1996 ) indicate s tha

t th e larges t

fis h recorde d wa s ca . 1 5 cm ; longevit y i s five year s (Wiley 1973) . The VBG F ca n b e formulate da s L,=Lm(\-e- kl ), wher e L, = fish lengt

h a t timet, L r = theoretica

l maximu mfis h lengt h (L x assume d t o b e 1 5 cm) , an

d k = growt h coefficient . Then , usin g alengt

h a t maturit y o f approximately 4. 5 c

man d U- = 1 5 cm , k

= 0.1724 , th e VBG

F estimate da

n ag e o f 3. 6 y r basedo n alengt h o f transformatio n fromfemale t o mal e o f 7 c mSL . The adjustedtota

l larva l entrainmen

t fo r blackey e goby (E Adj

_ T ) wa s use d t o estimat

e th e numbe

r o f breedin g female s neededto produc e the numbe r o f larva e entrained . Th

e estimate d numbe

r o f breedin g female s (FH

) whos e fecundit

y equal s th e estimate d tota l los s o f entraine d larva

e i s calculate dassumin g ag e o f maturatio n o f

0. 5 yr an d longevit y valu e o f 3. 6 yr . Th e numbe r o f adult female s hindcas t

fro mth e larva

e entraine d a

t DCP P wa s greate

r fo r Analysi s Perio d 1 TENER A E9-055. 0 5-34 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 2 5.2.1 0 Blackey

e Gob y (FH = 12,000 ; SE

=23,900 ) tha

n fo r Analysi s Perio d 2 (FH

= 10,300 ; SE

=20,300 ) (Tabl e 5.2.10-4) . Sensitivit y Analysi s Longevit y ha dth e greates t

leverag e o

n recalculate d value s o f

FH (Tabl e 5.2.10-5) . Varyin g thi s parameter i n th e mode

l resulte di

n a n FH rang e o f 4,750-192,00 0 adul t

female s fo

r 1996-9 7 and 1997-9 8 analysi s periods , compare d t o di e origina l estimate o f

10,300-12,10 0 adult

females . Fecundit y an dlarva l survivorshi p ha

d di e next greates t amount o f leverag e o

n recalculate d FH. 

### 5.2.10. 4 Adul t Equivalen t Los s (AEL) N o independen

t estimate o f

surviva l o f blackey e gob y fromentrainment t o ag e o f adult s wa s foun di n th e literature . Therefore , w e used surviva l estimate s fo

r AEL fromtw o gob y specie s (cheekspo t

an dshado w goby ) presente d by Brodier s (1975) . Blackey e gob y larva l surviva l from entrainment

u p t o settlement

wa s estimate d startin g a

t estimate d averag e entrainment ag e (2.1 2 d ) t o 7 5 da t settlement

(Steel e 1997) , usin g dail y surviva l o f 0.92 6 derive d fromBrother s (1975) . Larva l survivorshi p ove r

tiiis perio d wa s calculate d a s 0.926^2. 9 » 0.004 . Juvenil e an d adul t survivorshi p wa s estimate dt o 2 y r o f age , whic h i s di e averag e ag e o f adult s assumin g linea

r surviva l fro m0. 5 (ag e o f

first reproduction ) t o 5 y r

(longevity) . Dail y finit

e survivorship wa s estimate da s e~ x

02/36S = 0.99 7 usin g annua

l instantaneou s mortalit

y = 1.0 2 (Brodier s 1975) . Survivorship fro

msettlement

t o adulthoo d ( 2 yr

les s di e 7 5 d o f

planktoni c duration ) i s then 0.99765 6 « 0.159 . Th e adjuste dtota

l larva l entrainment

fo r blackey e gob y (P Adj . T ) wa s used t o estimate th e numbe r o f equivalent

adult s los t

t o th e populatio n based o

n th e estimate d numbe

r o f larva e entraine d (Tabl e 5.2.10-6) . The estimate dnumbe r o f equivalent

adult s correspondin g t o th e numbe r o f larvae entraine da

t DCP P wa s 75,20 0 (SE

=220,000 ) fo

r Analysi s Perio d 1 an

d 64,10 0 ( SE =188,000 ) fo

r Analysi s Perio d 2 . Becaus e blackey e gob} ' ar e protogynou s hermaphrodites , w e d o no t assume that,4£ Z i s relate d t o FH b y afactor o f tw o sinc e w e canno t

assum e a50:5 0

TENERA E9-055. 0 5-34 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 3 5.2.1 0 Blackey e Gob y

se x rati o i n the adult population . Th

e magnitud

e ofth e SE

fo r th e tw o estimate s indicate s tha t th e difference s betwee

n analysi s period s ar

e no t statisticall y significant . Sensitivit y Analysi s ' Early larva

l an dearly juvenil e survivorship ha d th e greates t

leverag e o

n recalculate d value s o f AEL (Tabl e 5.2.10-7) . Varyin g either o f thes e parameter s i

n th e mode

l resulte d i n a n AEL rang e of 12,400-390,000 adult

equivalent s fo

r th e 1996-9 7 an

d 1997-9 8 analysi s periods , comparedt o th e origina

l estimate o f

64,100-75,40 0 adult

equivalents . The rang e of

estimate s o f entrainmen

t ha dles s effect

o n estimate d AEL. 

### 5.2.10. 5 Empirica l Transpor t Mode l (ETM) Monthl y estimate s o f

proportiona

l entrainmen

t (PE,) fo r blackey e goby i

n eac h /t h survey fro

m th e tw o year s sampledrange dfro maminimu

mo f zer o t o amaximu

mo f 0.859±0.54 3 ( l SE^PE, )) i

n Februar y 199 8 an d Marc h 199 9 (Tabl e 5.2.10-8) . N o larva e wer e collecte d a

t either th e DCP P intak e or fro mth e stud

y grid whe n bot h PE, an d th e proportio n o f

larva e presen t i n th e rt h survey perio d(fj) wer

e equa l t o zero (e.g. , Februar

y 1999) . Whe

n PE, = 0 an

d f>0(e.g. , Marc

h 1998) , larvae wer

e collecte d a

t th e DCP P intak e durin g th e survey perio d but not durin g th e entrainmen

t survey paire d wit

h th e 72-hou

r stud y gri d survey . For

blackey e goby , th e relatively larg e PE, fo

r Februar y 199 8 an d Marc h 199 9 resulte d fro

mth e fac t tha t n o blackey e goby larva

e wer e collecte d i

n th e stud y grid . Thi s PE, wa s calculate d usin g th e larva l densit y fro mth e weekly entrainment

sampl e (Appendi

x H ) multiplie d b

y th e unsampled volum

e inshor e ofth e tw o cell s neares t

th e intak e (D l an d El ) t o approximat

e th e numbe

r o f larva e i n thi s volume . Thi s numbe

r wa s then added t o th e numbe r o f larva e foun d i n cell s Dl an

d El , zero i n thi s cas e a s wel

l a s elsewher

e i n th e grid , to approximat

e th e numbe

r o f larva e i n the whol e stud y grid . Th e lo w / value s associate d wit

h thes e PE, ' s indicated tha t fe w larva l blackey e gobie s wer

e collecte da

t th e intak e structur e durin g th e survey perio d an d tha t thes e estimate s ha

d lo w weight s attribute dto the

mi n calculatin g the annua

l estimat e o f entrainmen

t mortality . The greates t abundance s o f

blackey e goby larva

e a t th e intak e structur e occurre d fro

mJuly through Septembe r o r Octobe r o f eac h yea r a s indicated b

y th e highe

r value s o f / durin g thos e months . TENER A E9-055. 0 5-34 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 4 5.2.1 0 Blackey e Gob

y Empirica l transpor t modelin g result s fo

r blackey e goby (P M ) sho w th e effect s o f

lo w estimate d larva l duration s (Figure 5.2.10-6) . Blackey e goby larva e wer e collecte d throughout

th e stud y grid , an dthus , P s wa s calculate db y usin g alongshor

e an d onshor e current movemen t ove r estimate dlarva

l entrainment

ages ; stud

y gri d estimate s ofth e numbe r o f blackey e goby larva

e were extende dalongshor

e o r wer e extrapolate d offshore , based o n stud y gri d abundanc e pattern s offshore , an

dthen extende dalongshore . Alongshor e larva l transpor t ove r th e shor t larva l duration s estimate dfro

mentraine dlarvae (averag e o f 2 dto maximu

mo f 5 dold a t entrainment) resulte di n low estimate s ofP s . Consequently , estimate s o f P M over thes e smal l extrapolate d area s wer e high . Estimate s o f

P M wer e reasonably simila

r betwee n th e tw o analysi s period s fo r either larva l duratio n (mea

n o r max.) , whether

extendin g P s only alongshor e or extrapolatin g offshor e an dthen extendin g alongshore . The alongshor e P M valu e range d fro

m0.17 4 t o 0.228 , whil e th e extrapolate dP M value s rang e fro

m0.07 9 t o 0.179 . 

### 5.2.10. 6 Interpretatio n o f Assessmen t Result s Blackey e gob y doe s no t

suppor t acommercia

l or recreationa

l fishery, an

d there i s littl e informatio n o

n thei r ecologica l rol e i n th e community . However , there are som e indication s o f thei r importanc e a s forag e fo

r other specie s (e.g. , cormorants : Lov e 1996) . Becaus e ofth e absenc e o f

an y fishery fo

r thi s species , there ar

e n o catch dat atha

t ca n b e used t o compar

e harves t mortalit y rate s t o entrainment

mortalit y rate s (P

M ) o r t o estimate d FH

an d AEL values . Result s o f ETM modelin g sho w tha

t th e powe r plan t ma y annually entrai n approximatel y 17-23 % ofth e blackey e gob y larva e fro ma n are aapproximately twic e tha t ofth e stud

y grid . Fecundit

y hindcas t estimate s indicat

e tha t thes e value s ofP M ma y b e equa l t o predicte d losse s ofth e reproductiv e output

o f about 10,000-12,00 0 adult

females . A

n independen

t estimate of

AEL yield s apredicte dlos s o f

64,000-75,00 0 adult s (male s an d female s combined) . Blackey e gobie s are protogynou s hermaphrodite s (Col e 1983 ; Breitbur g 1987 ; Col e and Shapiro 1992) an d there i s n o reaso n t o assum

e tha t th e adul t populatio n fo

r thi s specie s reflect s a50:5 0 sex rati o tha t woul dt o require dfo

r th e relationshi p o f

AEL = 2FH . Although bot

h o f thes e estimate s ar

e relativel y larg e th e loca

l populatio n o f

adul t blackey e goby doe s not

exhibi t an y long-ter m decline s basedo

n DCP P Receivin g Wate

r Monitorin g Progra

mstudie s o

n subtida l fishe s (Figur e TENERA E9-055. 0 5-34 4 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2.1 0 Blackey e Gob y

5.2.10-7 : Tener

a1997c) . Th

e time perio d sinc e powe

r plan t operatio n bega

n i s muc h greate r tha n th e relatively shor

t life-spa n (~ 5 yr ) o f blackey e gobies , indicatin g tha t there ha s probably bee

n sufficien t time fo r powe r plan t effects to becom

e apparen t fo r thi s species . The Intak e Cove surfac e plankton tow s wer e als o analyze d to determin e i f an y declinin g trend s i

n larva l productio n couldb e detected . Thes e datawer e onl y analyzed fo

r th e perio d Decembe

r through June . Blackey e goby larva e wer e presen t i n th e intak e cov e sample s collecte d durin g Decembe r through June , bu

t wer e als o abundan

t i n the.entrainmen

t subsample s collecte d fro

m Jul y through September . Therefore , th e inde x based o n thes e datatha

t wa s used to adjust

annua l entrainmen

t estimate s t o the long-ter

maverag e ma

y no t b e agood estimator

fo r blackey e goby . Ther e i s no wa y t o estimat

e ho w th e inde x would hav e changed i

f based o n a n entir e 1 2 m o period . Nonetheless , the Intak e Cov e surfac e plankto n tow s datado not sho w an y declinin g trend s i n annua l mea n larva l blackey e goby densitie s an d larva l densitie s i

n 199 7 an d 199 8 wer

e greate r tha n the nine yea

r average(Figur e 5.2.10-5) .

• , Estimate s o f

tota l annua l entrainmen

t mortalit y (P M ) fo r thi s specie s wer

e relativel y hig

h amon g th e target fish tax aexamined(ca . 13-23%) . Thes e value s ar e base d o n extendin g th e larva

l abundanc e within th e stud

y gri dalongshor

e (o r extrapolatin g tha

t abundanc e offshor

e an d the n extendin g i

t alongshore ) using estimate d larva l duratio n a

t entrainment . The shor

t estimate d larva l duration s fo

r thi s tax aresulte d i

n relativel y small estimate d area s fo r th e populatio n a

t ris k Thes e small populatio n area s ar e representativ e ofth e reflect s th e small siz e rang e fo r th e majorit y o f entraine dlarva

e (2.0-3. 4 mm) . Thi s siz e rang e i s wel l below th e reporte d rang e a t flexion o f 5.8-6. 8 m m(Mose r 1996) . I n fact , ou r observed minimu

mlarva l length s wer

e les s tha n reporte dhatchin g length s i n the literature , whic

h ma y b e due to natura

l variatio n i

n hatchin g length s plu s a

n undetermine dcontributio n o f larva l shrinkag e du e t o preservatio n (Theilacke r 1980) . Thi s ma

y indicat e tha t ou r assumptio n tha

t age- 0 dlarva

e correspon d to ou

r minimu m 99 % larva l lengt h i s inaccurat

e an d tha t al l larva e les s tha n maximu mreporte d hatchin g lengt

h o f 3. 0 m m(Mose r 1996) wer

e aged- 0 d . Thi s would furthe r reduc e ou r estimat e o f larva l duratio n an dpopulatio n area . While the smal l area s base

d o n thes e shor

t larva l duration s an

d alongshor

e an donshor e curren t movement s lead , i

n part , t o th e hig h estimate s of

entrainment

mortality , th e TENER A E9-055. 0 5-34 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 6 5.2.1 0 Blackey e Gob y
siz e ofth e entraine d larvae indicate tha tth e tim e th e larvae ar

e expose d t o entrainmenti s very short . Th e lac

k o f apparen tdecline s in th e loca l adultan d larva l population s ove r several generation s sinc e powe r plantstartu p indicate s tha

tentrainmentmortalit

y may onl y b e affectin g surplu s larva

l productio n tha

twoul d notlea

d t o a reductio n i

n th e local population . Thi s coul d als o indicate tha

tcompensatio n i s occurrin g a tsom e late r stag e i

n development . I

n eithe r case , i

t doe s no tappea

r th e DCP

P coolin g wate r intake i s causin g a long-ter m declin e i

n th e local populatio n o f

blackey e goby .

TENERA E9-055. 0 - 5-34 6 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2.1 0 Blackey e Gob y

Tabl e 5.2.10-1 . Larva

l mortalit y statistic s fo r thre e sympatri c gobiid s fro m Missio n Bay , Californi a (Brothers 1975) .

Specie s Clevelandia ios Ilypnus gilberti Quietula y-cauda Two^-Mont h Larva l Mortalit y Rate s (to settlement) % (Finite ) 98. 3 98. 6 99. 2 Annua l Post
Settlemen t Mortalit y Rate s % (Finite ) 89-9 1 66-7 4 62-6 9 (Instantaneous )

-2.3 9 -1.0 8 -0.9 6
Tabl e 5.2.10-2 . Estimate d tota l annua l entrainment(E T

) an d standar d erro r (SE(E T )) fo r blackey e gob y (Coryphopterus nicholsi) larvae fro m th e thre e analysi s periods .

Analysi s Perio d SE(E T ) 1 ) Oct23 , 1996-Sep30 , 199 7 138,000,00 0 2 ) Oct1 , 1997-Se p 30 , 199 8 133,000,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 157,000,00 0 14,100,00 0 13,300,00 0 14,600,00 0

Tabl e 5.2.10-3 . Estimate d tota l annua l adjusted entrainmen

t(E AdJ

_ T ) an d standar d erro r ( SE(E AdJ

_ T ) ) fo r blackey e gob y (Coryphopterus nicholsi) larvae fro m th e three analysi s periods . Analysi s Perio d ^Adj-T 1 ) Oc t23 , 1996-Se p 30 , 199 7 128,000,00 0 2 ) Oc t1 , 1997-Sep30 , 199 8 109,000,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 128,000,00 0
TENER A E9-055. 0 5-34 7 SE(E M . T ) 13,100,00 0 10,900,00 0 11,900,00 0 Fina l 316(b ) Demonstratio n

Marc h 1,200 0P.6 8 5.2.1 0 Blackey e Gob

y Tabl e 5.2.10.-4 . Estimate dnumbe r o f blackey e gob y adul t

(Coryphopterus nicholsi) female s ( FH

) whos e reproductiv e output wa s equivalent

t o th e adjuste d numbe

r o f larvae entraine dpe r

yea r ( E Adj

_ T ) a t Diabl o Canyon Powe

r Plant includin g th e standar derro r ofth e estimate (SE(FH)) an d 90 % confidenc e limit s (C.L.) . Analysi s Perio d Uppe r Lowe

r FH SE(FH) 90 % C.L . 90 % C.L . 1 ) Oct 23 , 1996-Se p 30 , 1997 2 ) Oct 1,1997-Se p 30,199 8 3 ) Jul 1 , 1997-Ju n 30 , 199 8 12,00 0 23,90 0 315,00 0 46 1 10,300 20,30 0 268,00 0 39 3 12,100 24,00 0 316,00 0 46 2

Tabl e 5.2.10-5 . Blackey e gob y (Coryphopterus nicholsi): Sensitivit y analysi s fo

r FH fro mth e thre e analysi s period s recalculate d fo r each model inpu

t parameter

(0): pAdj-T ± I64 5 SE(0); other

parameter s are 0. e ±l645Cy W whereCV(0)= l.Oor

100%. a) Analysi s Perio d1 : October 1 , 1996-Septembe

r 30 , 1997

Parameter FH = pAdj-T S larvae U Eggs/y r Longevity Maturation Estimate

= 12,00 0 128,000,00 0 0.85 0 8,06 0 3.6 0 0. 5 Minimu

m
10,00 0 10,20 0 2,32 0 5,57 0 11,10 0 Recalculate d FH

Maximum
14,10 0 62,40 0 62,40 0 192,00 0 14,40 0 Rang e

4,05 0 52,20 0 60,10 0 186,00 0 3,21 0

TENER A E9-055. 0 5-34 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 9 __„..-- , 5.2.1 0 Blackey e Gob y
Tabl e 5.2.10- 5 (continued) . Blackey e gob y (Coryphopterus nicholsi): Sensitivit y analysi s fo r FH fro mth e thre e analysi s period s recalculate d fo r eac h mode l inpu t paramete r (0): P-Adj-T ± 1 - 6 4 5 SE0) ; othe

r parameter s ar

e ff.g±iM5CV0) wher

e CV( 0) = 1.

0 or 100% . b ) Analysi s Perio d 2 : Octobe r 1 , 1997-Septembe

r 30 , 199 8

Paramete r FH = E ^Adj-T S larvae # Eggs/y r Longevit y Maturatio n Estimat e

= 10,30 0 109,000,00 0 0.85 0 8,06 0 3.6 0 0. 5 Minimu m

8,58 0 8,71 0 1,98 0 4,75 0 9,49 0 Recalculate d FH

Maximu m
11,90 0 53,10 0 53,10 0 163,00 0 12,20 0 Rang e

3,37 0 44,40 0 51,20 0 158,00 0 2,74 0

c ) Analysi s Perio d 3 : July 1 , 1997-Jun e 30 , 199 8

Paramete r FH = pAdj-T Slarvae #Eggs/y r Longevit y Maturatio n Estimat e

12,10 0 128,000,00 0 0.85 0 8,06 0 3.6 0 0. 5 Minimu m

10,20 0 10,30 0 2,33 0 5,59 0 11,20 0 Recalculate d FH

Maximu m
13,90 0 62,60 0 62,60 0 192,00 0 14,40 0 Rang e

3,69 0 52,30 0 60,20 0 187,00 0 3,22 0

TENER A E9-055. 0 5-34 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.7 0 5.2.1 0 Blackey

e Gob y Tabl e 5.2.10-6 . Estimate dnumbe r o f equivalent

blackey e gob y (Coryphopterus nicholsi) adult s (AEL) equa l t o th e adjuste d numbe

r o f larva e entraine d pe

r yea r ( E Adj _j ) a t Diabl o Canyon Powe

r Plan t includin g th e standar

d erro r ofth e estimate (SE(AEL)) an

d90 % confidenc e limit s (C.L.) . Analysi s Perio d Uppe r Lowe

r AEL SE(AEL) 90 % C.L . 90 % C.L . 1 ) Oct 23 , 1996-Sep 30 , 1997 75,20 0 220,00 0 9,260,00 0 61 1 2 ) Oc t 1 , 1997-Sep 30 , 199 8 64,10 0 188,000 7,890,00 0 52 1 3 ) Jul y 1 , 1997-Jun e 30 , 199 8 75,40 0 221,00 0 9,290,00 0 61 3

Tabl e 5.2.10-7 . Blackey e gob y (Coryphopterus nicholsi): Sensitivit y analysi s fo

r AEL fro mth e thre e analysi s period s recalculate d fo r each mode

l inpu t paramete r (0): E

AdJ

_ T ± 1.64 5 SE(0) ; other

parameter s are ff.gtiMScrtf) wher e CV(0)= 1.

0 or 100% . a ) Analysi s Perio d1 : Octobe r 1 , 1996-September

30 , 1997
Paramete r Estimat

e AEL = 75,20 0 E AdJ

_ T 128,000,00 0 S early larvae S early juvenile Minimu m 87,90 0 390,00 0 390,00 0 Recalculate d AEL

Maximu m

, 62,60 0 14,500 14,50 0 Rang e

25,30 0 375,00 0 375,00 0

TENERA E9-055. 0 5-35 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.7 1 5.2.1 0 Blackey e Gob

y Tabl e 5.2.10- 7 (continued) . Blackey e goby (Coryphopterus nicholsi): Sensitivit y analysi s fo r AEL fro mth e thre e analysi s period s recalculate d fo r eac h mode l inpu t paramete r (0): PA^-T ± 1-64 5 SE(0) ; othe

r parameter s ar

e g.^\MScr(d) w hereCV(0)= 1. 0 o r 100% . b ) Analysi s Perio d2 : Octobe r 1 , 1997-Septembe

r 30 , 199 8

Paramete r

Estimat e AEL =64,10 0 P-Adj-T 109,000,00 0 S earlylarvae 00037 2 S early ° 1 5 8 juvenile Minimu m
74,60 0 332,00 0 332,00 0 Recalculate d AEL

Maximu m
53,60 0 12,40 0 12,40 0 Rang e

21,00 0 320,00 0 320,00 0

c ) Analysi s Perio d3 : July 1 , 1997-Jun e 30 , 199 8

Paramete r

Estimat e AEL = 75,40 0 E Adj

_ T 128,000,00 0 S early larvae 00037 2 S early ° 1 5 8 juvenile Minimu m
87,00 0 391,00 0 391,00 0 Recalculate d AEL

Maximu m
63,90 0 14,60 0 14,60 0 Rang e

23,10 0 376,00 0 376,00 0

TENER A E9-055. 0 5-35 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.7 2 5.2.1 0 Blackey e Gob

y
Tabl e 5.2.10-8 . Blackey e goby (Coryphopterus nicholsi): Monthly estimate s o f proportiona

l entrainment

(PE,) an

d annua l proportio n o f

larva e hatche d i

n th e ith survey perio d (fj) and associate d standar d error s (SE) used i

n estimatin g entrainment mortalit y fo r tw o analysi s periods .
a ) Analysi s Perio d 3 : Jul y 1 , 1997-Jun e 30 , 199 8 Surve y Star t

Dat e Ju l 21 , 199 7 Au g 25 , 199 7 Se p 29 , 199 7 Oc t 20 , 199 7 No v 17 , 199 7 De c 10 , 199 7 Ja n 22 , 199 8 Fe b 26 , 199 8 Ma r 18 , 199 8 Ap r 15 , 199 8 Ma y 18 , 199 8 Ju n 8 , 199 8 b ) Analysi s Perio d 4 : Jul y 1 , Surve y Star t

Dat e Ju l 21,199 8 Au g 26 , 199 8 Se p 16 , 199 8 Oc t 6 , 199 8 No v 11 , 199 8 De c 9 , 199 8 Ja n 12 , 199 9 Fe b 3 , 199 9 Ma r 17 , 199 9 Ap r 14 , 199 9 Ma y 24 , 199 9 Jun e 23 , 199 9
TENER A E9-055. 0 PE, 0.014 1 0.035 3 0.039 8 0.45 2 0.29 1 0.065 8 0.051 2 0.85 9 0 0.85 9 0.29 1 0.20 2 1998-Jun e 30 , PE, 0.037 7 0.013 0 0.0074 7 0.018 6 0.16 7 0.057 5 0.029 7 0 0.85 9 0.39 5 0.016 4 0.012 5 SE

(PE,) 0.0079 8 0.013 0 0.017 2 0.28 8 0.18 5 0.033 2 0.027 0 0.54 3 0 0.36 1 0.13 0 0.11 1 199 9 SE(PE,) 0.016 7 0.0053 9 0.0037 0 0.0095 3 0.14 8 0.051 4 0.041 3 0 0.50 4 0.21 7 0.0062 0 0.0055 5
5-35 2 fi

0.20 6 0.21 9 0.14 3 0.039 0 0.052 4 0.017 4 0.044 7 0.014 0 0.0017 2 0.036 8 0.085 4 0.14 0 

### f 0.16 0 0.18 2 0.068 7 0.15 3 0.090 3 0.0087 9 0.0016 3 0 0.075 5 0.083 7 0.080 6 0.095 5 SP(f)

0.018 7 0.014 0 0.012 7 0.0050 0 0.0055 4 0.0016 0 0.0055 6 0.0015 0 0.00031 0 0.0028 5 0.0066 7 0.011 9
SP(f) 0.011 5 0.013 1 0.012 2 0.023 6 0.011 8 0.0011 8 0.00031 0 0 0.0073 0 0.0078 5 0.0055 5 0.0086 2
Fina l 316(b ) Demonstration Marc h 1,200 0P.7 3 5.2.1 0 Blackey e Gob y

U J + « E 

# J OT c a > Q 

### c C O C D 0.32 " 0.30 - 0.2 B 0.2 6 0.24 - 0.2 2 0.20 - 0.1 8 0.1 6 0.14 - 0.12 - 0.1 0 0.08 - 0.06 - 0.04 - 0.02 - o.oo - 

## ........Llil l Blackey e goby (Coryphopterus

nicholsi)

iki , 1111II111MI T UTTITIITTITT1 1 O N O J F M irTmTTTTiiiinniiTnTqrrTiiiMTiiiTfrTTTirTitii q A J M I J I J ASONO J F M TT f 11 1 l[ T M I I M rfTTTTHTT I M TT11 1 II I 111111T111 1 II I 111 1 | J I A | S l O | N | D | J ) F j M | A | Surve y Dat e T designate s surve y wit h densit

y = 0

Figur e 5.2.10-1 . Weekl y mea n larva l densit y (#/m 3 + 1 S.E. ) a tth e DCP P intake .

TENER A E9-055. 0 5-35 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0m

z m 

## H m C O i o O l y i o

0 1 • 

## 2

3
2 a
r 1 </ ) r o 3 o =• . o o o 3 Blackey e gob y (Coryphopterus nicholsi)

C O 

# E 0.3 2 0.2 8 0.2 4 0.2 0 0.1 6 0.1 2 0.0 8 0.0 4 0.0 0

Dept h Contours H I 2 0 meter s
• —4 0 meter s H M > 6 0 meter s Poin t Bucho n
DCP P Intak

e

Poin t San Lui s

Jul
. 21 , "9 7 Aug
. 25,'9 7 Sep
. 29,'9 7 Oct
. 20 , "9 7 Nov
. 17 , "9 7 Dec
. 10,'9 7 

### Figur e 5.2.10-2a . Mea

n larva l densit y (#/m J

### ) collectedi

n the DCP P stud y grid cell s anda

t the entrainmen

t sampling location . r o C D u o C D « < C D 

### o o I T > <

^ 1

j * *m

z m 

# n m C D • o 0 1 CJ l

c o c n 0 1

3 5 L at _CT 

### 2 ° 

# 1 1

r o t o o S3* . o o o 3 Blackey e gob y (Coryphopterus nicholsi)

C O 

# £ 0.3 2 0.2 8 0.2 4 0.2 0 0.1 6 0.1 2 0.0 8 0.04 0.0 0

Dept h Contour

s <—TM ~ 2 0 meter

s «•—1 » 4 0 meter

s
• —60 meter

s Poin t Bucho n
DCPP Intak

e

Poin t San Lui s

Jan
. 22 , '9 8 Feb
. 26 , '9 8 Mar
. 18 , '9 8 Apr
. 15 , '9 8 Ma y 18 , '9 8 Jun
. 8 , '9 8 Figur e 5.2.10-2 b (continued) . Mea n larva l densit y (#/m 3 ) collecte d i

n th e DCPP stud y gri d cell s an d a t th e entrainmen t

samplin g location . c n i o C D 0 1 o j r C D * < C D o 0 o ;

^ 1P.7 6 5.2.1 0 Blackey e Goby

Vi O • c .C O c C O 

### 5 C D & 

# I o 

### o X J o Ul Q) > % C U mX" o Sm\ C D \ \ \ \ \ \ \ \ \ NIBOOfflWIO-J O COCJCMCJ^^OO O oooooooo o 

## ,W/ # c g • E 

## a £ fc o S fc 8 > I 

# I C O s m fc 

### s 1 

## 1 

# 1 S i • s b 8 • 

### 1 

# 1

TENER A E9-055. 0 5-35 6 Fina l 316(b ) Demonstratio n Marc h 1.200 0m

z r n 

## £ m C O I o c n c n b

c n C O c n -v l

3 CO . C O

_ h 52 _a ; 

# H

- » • 0 )

- ^- * r o m o J * o o O 3 Blackey e gob y (Coryphopterus nicholsi)

C O


# . E 0.3 2

0.2 8 0.2 4 0.2 0 0.1 6 0.1 2 0.0 8 0.0 4 0.0 0

Dept h Contour

s

• 2 0 meter

s

— • 4 0 meter

s ^ —6 0 meter

s Poin t Bucho n

DCP P Intake

Poin t Sa n Lui s

Jan
. 11 , '9 9 Feb
. 2 , '9 9 Mar
. 16 , '9 9 Apr
. 13 , '9 9 Ma y 23 , '9 9 Ju n 22 , '9 9 Figur e 5.2.10-2 d (continued) . Mean larva l densit y (#/m 3 ) collecte d i

n th e DCP P study gri d cell s an d a t th e entrainmen t

samplin g location . k» 0 3 5 " o s r C D « < C D 

### o o o r < <

3P.7 8 5.2.1 0 Blackey

e Gob y

Blackey e gob y (Coryphopterus nicholsi) N=4,81 2 2 0 —

_Occurrence01111 111111

* o -Frequencym0111111 11Percent01-111111111 M i n

1. 5 2

c Moa n Media n 1"Jf c 9 9 %

O 2. 5 3. 0 3 . S Lengt h Categor

y (mm ) 11111 1 5 * 1 2 3 A S 6 Estimate d age (days

) H - p •fc » * V M a x



# t ~

1 1 1

- » * «
Figur e 5.2.10-3 . Lengt

h frequency o f

all measure d larva

l fis h collecte d i

n th e entrainment samples . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva

l length s ar

e noted . X-axi s scal e i s not

continuou s a

t large r lengths .

TENER A E9-055. 0 5-35 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0p " . -J P.7 9 5.2.1 0 Blackey e Gob y

25— I
2 0 —
15 "

< D O 10 " 

### c C D 3 U O O

> » * » 25 " 

### c C D 3 O " C D 2 0 —

mm 15 " C C D O > - 10 " <3 ) 0 - 5 — Mi n

1. 5 Blackey e gob y (Coryphopterus nicholsi)
Entrainment : N=69 9 1 % Media n Mea n 99 %

Grid : N=14 4
Mi n 1 % Media n Mea n

2. 0 V I a x

i i i T 1—I—I — V o r ' %%

99 % Ma x

4. 0 -i— r Lengt h Categor

y (mm )
Figure 5.2.10-4 . Lengt

h frequency o f

measure d fis

h fro mentrainmen

t survey s tha

t paire d wit h gri dsurvey s (bot

h year s combined) . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva l length s ar

e noted . X-axi s scal e i s not

continuou s a

t large r lengths . TENER A E9-055. 0 5-35 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.8 0
5.2.1 0 Blackey e Gob y

a i C O I + • n E

C O e C D Q C D C D 0.04 8 — 0.04 4 — 0.04 0 - E 0.03 6 ~ 0.03 2 - E 0.02 8 -z. 0.02 4 - I 0.02 0 - E 0.01 6 — 0.01 2 - E 0.00 8 - E 0.00 4 ~ E o.ooo — Blackey e gob ) r(Cory p hopterus nicholsi)


# I :

i 199 0 199 1 199 2 199 3 1994 Yea r 199 5 199 6 199 7 199 8

Figur e 5.2.10-5 . Annua

l mea n densit y +/
- 2 standar

d error s (vertica

l lines ) an d grand mea

n densit y fo r all year s combine d(horizonta l line ) fo r th e Intak e Cove surfac e plankto n tows . The annua l mea n densitie s ar

e basedo n seven consecutiv e month s o f data(Decembe

r throug h June ) excep t fo r 1990 , which ha

donl y five month s (Februar y through June) .

TENERA E9-055. 0 5-36 0 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2.1 0 Blackey e Gob y P.8 1

Blackey e gob y (Coryphopterus nicholsi)

- mea n duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

Estimat e 90 % C.l
.

S x lO x IS x 20 x 2B x SO x SS x 40 x 8 7 k m IT * K m 261k m 34 7 k m 434kf n 621k m SO B k m BO S k m

Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alongahor e Blackey e goby (Coryphopterus nicholsi)

• mea n duratio n Analvsi s Perio d 4 : Ju l 1998-Jun,}99 9

Estimat e 90 % C.l
. P « = 0.17 4 P * = 0.163 ±0.20 7

20 x S« 7 k m SO x S 2 1 k m SS x

SO B k m 40 x

BB S k m 81 a » o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alonoenor e Figur e 5.2.10-6a . Tota

l annua l entrainmen

tmortalit y (P M ) an d 90 % confidenc e interva l (CI. ) a s a functio n o f

di e reciprocal ofth e fraction ofth e populatio n a trisk an d containe d i n di e study gri d (j> s ) use d t o approximat

e di e alongshor e exten tofth e study gri d populatio n expande d o n di e basi s o f alongshor e curren

tmovements an

d th e offshore extrapolatio n o f study gri d abundance extende d alongshor e usin g bod i onshor e an d alongshor e curren

tmovements with 90 % C J.' s indicated . TENERA E9-055. 0 W6 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 2
5.2.1 0 Blackey e Gob y Blackey e gob y (Coryphopterus nicholsi)

- maximu m duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

Estimat e 90 % C.l
.

O x O k m S x

B 7 k m l O x IS x 20 x 2S x

1 7 4 k m 2S 1 k m 34 7 k m 43 4 k m SO x S 2 1 k m SS x

SO B k m 4 0 x

ee s k m Six * o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alongahor e Blackey e gob y (Coryphopterus nicholsi) - maximu m duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % C.l
.

S x B 7 k m l O x

1 7 4 k m I S x

2 S 1 k m 2 0 x

3 4 7 k m 2 S x

4 3 4 k m 3 0 x

S 2 1 k m SS x 40 x

BO B k m BO S k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Diatano e Alongshor e Figur e 5.2.10-6b . Tota

l annua l entrainmen

t mortalit y (P u ) and 90 % confidenc e interva l (CI. ) a s afunction o f

di e reciproca

l o f di e fraction ofth e populatio n a t risk an d containe d i

n di e stud y gri d(j> s ) use dt o approximat e th e alongshor

e extent ofth e stud

y gri d populatio n expande d o n th e basi s o f alongshor e current movement s and di e offshor e extrapolatio n o f

stud y gri d abundanc e extende dalongshor

e usin g bot

h onshor e and alongshor

e current movement s wit

h 90 % CI.' s indicated . TENER A E9-055. 0 5-36 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.8 3 

### -*H 1 5.2.1 0 Blackey e gob y

o 0 0 ) c C O C D V E I o L O c C O C D E 8 4 : 8 6 Plan t Start-u p Yea r 

### Figure 5.2.10-7 . Mea

n numbe r of blackey e gobie s observe dpe r 50-mete r subtida l transec t in th e DCP

P RWM P Sout h Contro l area . Splin e smoothing algorith muse dt o dra w th e curv e throug h th e points .

TENER A E9-055. 0 5-36 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 4



# Blan k Pag eP.8 5 5.2.1 1 Flatfishe s 

### 5.2.11 Assessment

of Flatfishes

(Family Paralichthyidae) Left-eyedflatfishe s (Paralichthyidae ) are represente d i n th e Californi aCurren

t regio n b y 8 genera an d1 9 specie s (Nelso n 1994 ; Mose r an d Sumida1996) . The larva e o f fou r sandda b specie s (genu s Citharichthys) ar

e abundan t i n CalCOF I tow s u p t o 18 0 k moffshore , whil e other para l ichth y i dflatfish suc

h a s th e Californi ahalibu t

(Paralichthys californicus) are primaril y foun dwithin 4 0 k

mo f shore . Female s i

n thi s famil

y ar e oviparou s wit

h larg e batch size s an

d multipl e spawns . Spawning take s plac e throughout th e yea r wit h seasona l peaks . DCP

P entrainment

effect s o n larva e wer e assesse d fo

r sanddab s (Citharichthys spp. ) and fo r Californi a halibut . 

### 5.2.11. 1 Sanddab s (Citharichthys spp. )

Citharichthys stigmaeus Jorda n an d Gilber t 1882 ; speckle d sanddab ; lengt h t o 1 7 cm ; Princ e Willia

mSound , Alask

at o Bahi aMagdalena , souther n Baj aCalifornia ; nearshor e t o 60 7 m ; eye dside brown o r ta n wit h black speckle s an

d spots ; blind sid e whit e (Miller an dLe a1972 ; Eschmeye

r et al . 1983) . Citharichthys sordidus (Girar d 1854) ; Pacifi c sanddab ; lengt h to 4 1 cm ; Se ao f

Japa n to Berin g Seat o Cab o Sa

n Lucas , souther

n Baj aCalifornia ; 0-54 9 m(Miller an d Le a 1972 ; Eschmeye

r et al . 1983) ; eyed side ligh

t brown , mottled wit

h dar k brow n sometime s wit

h yello w an

d orang e spots ; blind side whitis h o r ligh t ta n (Eschmeye

r etal . 1983) . Citharichthys species , includin g th e speckle d an d Pacifi c sanddabs , ar

e commercially fished an

d generall y foun

dove r sand y bottom , wit

h th e speckle d sandda

b generally foun

d i n shallo w wate

r bay s an destuarie s (Mose

r 1996 ; Rackowsk

i an d Pikitc h 1989) . Sandda

b female s are oviparous ,
TENER A E9-055. 0 5-36 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 6 5.2.1 1 Flatfishe s producin g planktoni c egg s an dlarva e (Mose r 1996) . Accordin g t o Mose r (1996) , bot

h specie s spawn year-roun di

n th e CalCOF

I are awit h thei r highes t abundanc e durin g th e period s August
Decembe r fo r speckle dsanddab , an

d January-Februar

y plu s August-Octobe r

fo r Pacifi c sanddab . I n souther n California , Goldber

g an d Pha m(1987 ) foun

d tha t speckle d sandda

b spawn March-October , whil e For d(1965 ) reporte d tha

t Pacifi c sanddab s spawn mainl y fro mApril
September . Longevit y an dreproductio n hav e bee

n investigate d i

n bot h specie s o f

sanddabs . For

d (1965 ) foun dtha t femal e speckle dsanddab s begin t o spawn i n thei r second yea

r an d ca n produc e u

p t o thre e batche s o f

egg s pe r year . They ma

y produc e 1,000-6,00 0 egg s pe r batch an d ma y liv e ove r 4 y r (For d1965 ; Tabl e 5J.11-1) . Som e femal e Pacifi c sanddab s first matur e a t 2 y r (Smit h 1936) . Hal f

o f th e older female s ar

e matur e b y 3 y r an d al l are matur

e b y 4 y r (Arora1951) . Tota

l lifespa n ma y b e over 1 1 y r (Lov e 1996) . N o estimate s o f annua l eg g productio n hav e bee

n reported . Bot h specie s o f

sanddab s ca

n hav e extende d planktoni c durations . Sakum aan d Larson' s (1995 ) revie w report s that

speckle dsandda

b (Citharichthys stigmaeus) larva e ma y b e planktoni c u

p t o 324 d , whil e th e Pacifi c sandda b (Citharichthys sordidus) ma y remai n i n th e plankto n fo

r 27 1 d . Kendal l (1992 ) foun

dtha t speckle d sanddab s probably settl e afte r 113-32 4 d . Settlement

size s fo r speckle dan dPacifi c sanddab s ar e 3 5 m man d 4 0 mm , respectivel y (Mose r 1996) . Larva

l growt h rate o f Citharichthys spp. , mainly Pacifi c sanddab , fo r age- 0 y r individual s wa s 0.19-0.3 0 mm/d , an dth e monthl y instantaneou s mortalit y rate wa s 0.43 7 i

n 198 3 an d 0.17 6 i n 1984 (Roger s 1985) . Speckle dsandda

b mortalit y durin g th e eg g and larva

l perio d i s nearl y 99.9 % (For d 1965 ; Tabl e 5.2.11-1) . Summary

of Field Collections Sandda b larvae wer

e collecte da

t th e DCP P intak e structure durin g tw o periods : aminor puls e durin g December-Marc h an dastronge

r puls e durin g July-Septembe r i n al l year s 1996-199 9 (Appendi x H) . Their

highes t densit y occurre d i

n early Augus t

1997 (Figur e 5.2.11-1) . Th e densit y durin g July-Septembe r

199 8 wa s lowe

r tha n durin g th e sam

e month s i n 1997 , possibl y TENER A E9-055. 0 5-36 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 7 5.2.1 1 Flatfishe s due to th e E

l Nin o even

t tha t occurre d durin g the fall-winter season s spannin g 1997-9 8 (Lyn n et al . 1998 ; NOA

A 1999) . Ther

e wer e 25 4 sanddab s identified fro m170 bong o ne

t subsample s representin g 3.5 % ofth e entrainmen t subsample s collecte d an

d processe d fro

mtha t locatio n durin g thi s period . Ofth e tota l numbe r identified fro

mth e entrainmen

t subsamples , 11 3 wer

e Pacifi c sanddabs , 7 1 wer

e speckle d sanddabs , an

d 7 0 wer e onl y identifiabl e t o th e generi c level . Sandda b larvae , notably C. stigmaeus, occurre d year-roun d i n th e stud y gri d (Appendix H) , wit

h thei r greates t densit y occurrin g durin g Jul y 1997 an d 199 8 (Figure 5.2.11-2) . The spatia l distributio n o f

sandda b larva e i n th e gri d wa s inconsisten

t betwee n surveys . Generally , they wer e collecte dfarthe

r fro mshore , excep t

larg e number s collecte d inshor e i n July 1997 . Ther

e wer e 36 1 larva l sanddab s identifiedfro

m4 3 bong o ne

t subsample s representin g 1 % ofth e study.gri d subsample s collecte dan

dprocessed . Ofthe tota

l numbe r identified fro

mth e gri d subsamples , 14 2 wer e Pacifi c sanddabs , 15 6 wer e speckle d sanddabs , an

d 6 3 wer e identifiabl e t o onl y di e generi c level. ' Standar dlength s o f

sandda b larva e i n entrainment

subsample s betwee

n Octobe r 199 6 an d June 199 9 range dfro

m1. 3 m mt o 3 2 m m(Figure 5.2.11-3) . Onl

y one larva

e measurin g 3 2 m

mwa s collected ; th e next

larges t individua l wa s 3. 5 mm . Th e centra

l 98 % ofth e sandda

b length
frequency distributio n resulte di n minimu man d maximu mlength s fo

r th e analyse s o f

1. 3 m man d 3. 5 mm , respectively . Th

e growt h rat e o f larva l sanddab s (0.2 0 mm/d) reporte d b y Kendall (1992 ) an dSakum a(1995 ) wa s use

d t o estimate larva

l ages . Th e mea n larva l lengt h i n thi s distributio n wa s 2.6 1 m

man dapproximately 6. 5 do f

age . The reporte d hatch lengt h fo r C . stigmaeus i s about

1. 3 m man dles s tha n 2. 6 m mfo r C. sordidus (Mose

r 1996) . Length s o f

sandda b larva e wer e collecte d fo

r paire d DCP

P intak e an d stud y gri d subsample s (Figure 5.2.11-4) . However , ver y fe w measurabl e larva

e occurre d i

n th e coincident

subsamples : 4 a t th e DCP P intak e an d5 2 i n th e stud y grid . Thes e low sampl e size s preclude d statistica l analyse s an

drende r difficul t eve n qualitativ e comparison s betwee n the tw o lengt

h distributions .

TENER A E9-055. 0 5-36 6 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.8 8 5.2.1 1 Flatfishe s Estimating

Total Annual Entrainment Th e annua l estimate dmea

n entrainmen t

and associate d standar

d erro r fo r sandda b larvae sho w tha t fe w larva l sanddab s wer

e entraine d (Tabl e 5.2.11-2) . Estimate d entrainment wa s greater

i n 1996-9 7 Analysi s Perio d1 (E^= 7,160,000 ; SE = 702,000 ) tha

n i n 1997-9 8 Analysi s Perio d 2 (E T = 1,540,000 ; SE

= 283,000) . Th e high larva l abundanc e observe d i

n summe r 1997 produce d di e highes t

entrainment

estimates . Th e apparent

differenc e between th e estimate s fo r Analysi s Perio d2 (October

1997-September

1998 ) an d Analysi s Perio d 3 (Jul y 1997-Jun e 1998 ) illustrate s th e sensitivit

y o f unadjuste d annua

l entrainment

estimate s t o di e tim e perio d selecte d an d t o episodi c oceanographi c events . Th e estimate s fo r thes e tw o period s wer

e identica l o r ver y clos e i n valu e fo r mos t targe t taxa . Th e estimate d entrainment value s for

th e analysi s period s were no t adjustedby th e long-ter

mweekly Intak

e Cov e surfac e plankto n tow s (December-July) , becaus e sandda

b spawnin g occurre d mainl y afte r di e 7 m o surfac e to w perio d used fo r analysi s (Figur e 5.2.11-5) . Fecundity

Hindcasting

(FH ) Bot h FH and AEL mediod s require d age-specifi c mortality , and FH require d fecundit

y t o asses s entrainment

effects . Eg g andlarva

l surviva l rate s wer e estimate d usin g Ford' s (1965 ) estimate o f 0.001 5 surviva

l throug h th e first

9 0 dbase d on examinatio n o f fecundity , number

o f females , an d transforme djuvenile s (Tabl e 5.2.11-1) . Th e calculate d eg g an d larva l dail y surviva

l wa s 0.930/d . A n estimate dag e a

t entrainment

o f sandda b larva e wa s ca . 6. 6 d , base d o

n agrowt h rate o f 0. 2 mm/ dan da n averag e lengt

h a t entrainment

o f 2. 6 mm . Surviva

l t o entrainment

wa s estimate d a s 0.93 6 6 = 0.62 . Th e FH approach combine s larva

l entrainment

losse s an d adult fecundit y t o hindcas t

th e number s o f adul t female s effectively remove dfro mth e reproductivel y activ e population . A n estimate o f mea n annua l fecundit y wa s 15,41 4 eggs/femal e based o n arang e o f

fecundit y datafo r female s measurin g 8 5 t o 14 8 m

mi n total lengt

h (Tabl e 5.2.11-3 ; For

d 1965) . Ag e o f maturatio n wa s assume dt o b e equa l t o 2. 5 y r an d longevit y wa s assume d t o b e 6 yr

fro m For d(1965 ) an

dArora(1951) . Th e estimate d tota l larva l entrainment

wa s used t o estimate th e TENERA E9-055. 0 5-36 7 Fina l 316(b ) Demonstratio n Marc h 1.200 05.2.1 1 Flatfishe s

numbe r o f breedin g female s needed t o produc e th e numbe r o f larva e entraine d durin g th e thre e analysi s periods . A compariso n o f Analysi s Period s l an

d2 show tha

t th e valu e fo

r 1996-9 7 ( F H = 426 ; SE

= 996 ) to b e greater

tha n th e sam e time perio d fo

r 1997-9 8 (FH

= 92 ; SE = 215 ) (Tabl e 5.2.11-4) . Sensitivit y Analysi s Fecundit y ha dth e greates t

effec t o n recalculate d value s o f

FH (Tabl e 5.2.11-5) . Varyin g thi s paramete r i n th e mode

l resulte di n a n FH rang e o f ca . 18-2,21 0 adult

female s fo

r Analysi s Period s 1 an

d2 , comparedt o th e origina l estimat e o f 92-42 6 adult

females . Larva

l survivorship ha d th e nex t greates t effec t o n recalculate d FH. i Adult Equivalent

Loss (AEL) Th e AEL approach use s estimate s ofth e abundanc e o f entraine d organism s t o projec t th e los s o f equivalent number s o f

adult s based o

n mortalit y schedule s an

d ag e a t recruitment . Surviva

l rate s wer e estimate dfro

mentrainmen

t o f larva l stag e t o recruitmen

t int o th e fisher

y includin g juvenil e t o 2 yr adult s (Tabl e 5.2.11-1) . Larva l surviva l wa s estimate d fro

mth e averag e ag e a

t entrainment

throug h settlemen

t a s SLarvae = 0.930 ( 9 °~ 6 6 ) = 0.00 2 . Survivorship t o recruitmen t wa s apportione d int

o severa l ag e stage s fro

mFor d (1965 ; Tabl e 5.2.11-1) , an

dAEL wa s calculate d usin g th e entrainmen t ofasingl e ag e clas s havin g a n averag e ag e o f 6. 6 d . Value s of

AEL fo r Analysi s Period s 1 an

d 2 show tha

t th e valu e fo

r 1996-9 7 ( AE L = 2,370 ; SE

= 6,710 ) to b e greater

tha n th e sam e tim e perio d fo r 1997-9 8 (AEL

= 511 ; SE = 1,450 ) (Tabl e 5.2.11-6) . Sensitivit y Analysi s Early larva

l survivorship ha

dth e greates t

effec t o n recalculate d value s o f

AEL (Tabl e 5.2.11-7) . Varyin g thi s paramete

r i n th e mode

l resulte d i

n a n AEL rang e of 99-12,30 0 adult

equivalent s amon g th e thre e analysi s periods , compare d t o the origina l estimat e o f 511-2,37 2 adult TENER A E9-055. 0 5-36 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 0 5.2.1 1 Flatfishe s equivalents . Lat

e larva l throug h pre-recrui t

survivorshi p ha

d th e next greates t effect o n AEL. Th

e rang e o f entrainment

estimate s di d no t

substantiall y chang e th e calculate d value s of AEL. Empirical Transport

Model (ETM ) Monthly estimate s o f

proportiona

l entrainment

(PE,) fo r sanddab s i

n th e survey s fro

mth e tw o analysi s period s range dfro maminimu

mo f zer o t o amaximu

mo f 0.859±0.9 l l (±ISE(PE, )) i n Apri l 199 8 (Tabl e 5.2.11-8) . Whe n bot h PE, an d th e annua

l proportio n o f

larva e hatche d i

n th e /t h surve y perio d(fj) wer

e equa l t o zero , n o larvae wer

e collecte d a

t either di e DCP P intak e o r fro mth e study grid . Whe

n PE, = 0 but

f>0, larvae were collecte d a t th e DCP P intak e durin g th e surve y perio dbut

no t durin g di e entrainment

surve y paire d wit

h th e 72-hou

r study gri d survey . Fo r sanddabs , th e relativel y larg e PE, fo r Apri l 199 8 resulte d fro

mth e fact that n o sandda

b larvae were collecte di

n di e stud y grid . Thi s PE, wa s calculate d usin g th e larva l densit y fro mth e weekl y entrainment

sampl e (Appendix H ) multiplie d b y th e unsample d volum e inshore ofth e tw o cell s neares t

th e intak e (D l an d El ) t o approximate th e numbe r o f larvae i n thi s volume . Thi s number wa s the n adde dt o th e numbe r o f larvae foun

d i n cell s D l and El , zer o i

n thi s cas e a s wel l a s elsewhere i

n th e grid , t o approximat

e th e numbe

r o f larvae i n th e whol e study grid . Th e accompanyin g lo w valu e o f / (0.00893 ) indicate d tha

t there wer e fe w sandda b larvae i n th e water colum n and , therefore , di e hig h PE, ha d relativel y lo w weigh

t i n th e annua

l estimate o f entrainment

mortality . Jul y an

dAugus t ofth e first

stud y yea r an d Ma y an d Jun e ofth e second yea r ha dhigher value s o f / du e t o greater

larva l abundanc e i

n th e subsample s fro

mthes e months . Estimate s o f

P M between year s showed th e greates t difference s i

n point estimate s (Figure s 5.2. 1 l-6 aandb) . Estimate dmea n an d maximumlarva

l duration s ( 7 o r

1 1 d , respectively ) were relativel y similar , causin g minima l chang e i n point estimate s o f

P M within-years . Sinc e sandda b larvae wer e disperse dthroughou t th e stud y grid , P s wa s calculate d usin g bot h onshore an d alongshore current

movements . Densit

y wa s extrapolate d offshore , wit h acommon slop e fo

r al l survey s o f 0.0000342/

mfo r Analysi s Perio d 3 and 0.0000661/ mfo r Analysi s Perio d 4 . Th e offshor e extrapolatio n o f

stud y gri dabundance , followed b y a n alongshore extension , yielde d a
TENER A E9-055. 0 5-36 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 1 5.2.1 1 Flatfishe s
rang e o f P M fro mbot h analysi s period s o f

0.4-4.5 % ofth e larva

e containe d i

n a n estimate d populatio n o f

approximately 3 t o 2 2 time s tha t i n th e stud y grid . The are ao f

extrapolatio n range d betwee n 3 t o 2 0 time s th e 5 2 km-

2 are astud

y grid . The extrapolate d are awa s slightl y les s tha n th e populatio n becaus e ofth e slightl y increasin g tren d i n density . I

n comparison , usin g onl

y alongshor e extensio n o f

stud y gri d abundance , P M range d fro

m1-7 % ofth e larva

e i n a n are a tw o t o fou r time s th e stud

y gri dalongshor

e or around 30-6 0 k

mo f coastlin e distance . Interpretation

of Assessment

Results Estimate s o f

adult equivalent

loss , bot h FH and AEL, o f sanddab s depend o

n estimate d entrainment . Comparison s ofth e annua l estimate s o f

FH (92-426 ) an

d AEL (511-2,370 ) fro

m Analysi s Period s 1 an

d2 , tha t hav e comparabl e time periods , reflect s th e effect s ofth e hig h entrainmen

t estimate s fromsumme

r 1997 . The estimate o f

AEL assume s arecruitmen

t ag e o f 2. 3 yr , whil e female s i

n th e fecundit

y hindcastin g estimate rang e betwee n 2. 5 an d 6 y r (3. 7 yr assumin g linea

r survival) . The FH

an d AEL estimate s ar

e simila r (2-FH 10.25 = 736-3,408 ) whe

n accountin g fo

r additiona l surviva l (Tabl e 5-2.11-1 ) an

d equa l numbe r o f male s a s females . Sanddab s hav e bot

h commercia

l an d recreationa

l fishery value . Catc

h dataar e availabl e to compar e harves t mortalit y rate s t o entrainmen

t mortalit y rates . I n 1998 , a n estimate d 51,00 0 sanddab s wer

e caugh t b y recreationa

l angler s i n souther n Californi awater s (PSMF C RecFI N database) . Commercia

l ex-vesse l valu e i

n 199 8 fro mport s between Sa

n Dieg o and Mendocin o totale d $420,100 , representin g 595. 6 M T (PSMF C PacFI N database) . Valu e o f

sandda b landing s i n th e por t are ao f Morr o Bay , tha t include s Por

t Sa n Luis , i n 199 8 totale d $7,000 , representin g 12. 7 M T (PSMF C PacFI N database) . The estimate dlarva

l duratio n fo

r sanddab s (7-1 1 d ) produced apotentia l are ao f effect s between 3- 9 time s th e stud

y are a(fo r 7 dduration ) an

d 9-2 0 time s (fo

r 1 1 d duration ) tha

t wa s used i

n computin g a

n offshor e extrapolation-base d P s (Figur e 5.2.11-6) . Thi s indicate s tha t only th e commercia

l catch fro mth e loca

l port s o f Morr o Ba y an d Avil acould potentially b e affected b y entrainment . A

n estimate o f

6 0 g pe r averag e adult

(Arora1951 ) ca

n b e applie d to th e larges t mortalit y predicte db

y th e survival-weighte d FH estimate . I

f we assum e n o compensator

y TENER A E9-055. 0 5-37 0 Fina l 316(b ) Demonstratio n Marc h 1.200 05.2.1 1 Flatfishe s

Alternately , estimate s o f annua l entrainmentmortalit

y (P M ) coul d b e use d t o determin e th e effec t o f larva l entrainmento n Morr

o Ba y area catches . Proportiona l entrainmentmortalit

y ranged fro

m -1-7 % ove r areas rangin g fro m 3-2 2 time s th e stud y gri d area (large r area associate d wid i smalle r mortality) . Thes e proportiona l losse s can b e applie d t o di e 1993-199 9 annua l averag e revenu e fo r th e Morr

o Ba y area sandda

b catc h o f ca . $8,200/y r (PSMF C PacFIN Database ) assumin g n o compensation . Thi s result s in a n averag e dolla r valu e impac to n di e Morro Ba y are a sandda b fishery o f

$82/yr , b y translatin g a 1 % larva l mortalit y t o adultlosse s (usin g th e large r extrapolate d area s stil l conservativel y les s tha n di e fishery area) .

TENERA E9-055. 0 5-37 1 Fina l 316(b ) Demonstratio n Marc h 1.200 0 

# I i mortalit y an d directl y appl y th e ^£Z-base d los s t o th e fishery catch , 3,40 0 fish represents 0. 2 M T o r $ l 10 . However , FH

and AEL model s d o notconside r selectivity , catchability , an d fishin g effortwhe n extrapolate d t o fishery losses , s o thi s estimat e o f monetary valu e i s likel y a n m overestimat e ofth e los s t o th e fishery becaus e itassume s al l equivalen tadults wer e harvested .

Long-term trends , show n b y Intake Cov e plankto n tow s (Figur e 5.2.11-5) , sho w wid e variatio n o f larva l abundanc e from 1990-199 8 wid i n o apparen ttrend . Sinc e th e startu

p o f powe r plant operations , sanddab s hav e increase d i n Diabl o Cov e compare d t o pre-operatio n observation s (Figur e 4-3 9 in PG& E 1997c) . Fishery harves tinformatio n indicate s tha tcatche s i

n th e MBNM S hav e generall y increase d betwee n 198 0 an d 199 5 (Star

r e tal . 1998) , bu

tthere may b e a declinin g trend fo r catche s i

n th e Monr

o Ba y are a sinc e 199 4 (Figur e 5.2.11-7) . Declinin g catche s in th e Morr o Bay area coul d b e du e t o many factors , bu twithou tdat

a describin g fishin g efforti ti s difficul tt o attribut

e thi s apparen

tdeclin e t o an y featur

e ofth e fishery. Sinc e larva l abundanc e • doe s notappear t o b e declinin g i n th e Intake Cove , itseem s likel y tha tentrainmentmortalit

y i s no treducin g larva

l productio n locall y o r tha tcompensatio n in birt

h rate s i s occurring . 

# I



# f I f 

# I 1 i i i 

# I f i i 

# I tP.9 3 

# I t I I 1 

# I 1 1 I t I 

# i i 

# l i i t i i 5.2.1 1 Flatfishe s



### 5.2.11. 2 Californi a halibu t (Paralichthys californicus)

Paralichthys californicus (Ayre s 1859) ; Californi ahalibut : lengt h t o 15 2 cm ; Quillayut

e River , norther

n Washingto n t o Bahi aMagdalena , souther n Baj aCalifornia ; nearshor e t o 18 3 m ; eyedside mostly unifor mdar k brow n t o black , but

ofte n mottle d wit

h ligh t an ddark ; blin

dside usually whit

e (Mille r an d Le a1972 ; Eschmeye

r et al . 1983) . Californi ahalibut

i s a n importan

t par t o f California' s commercia

l an d recreationa

l fisheries (Leet et al . 1992 ; Star

r et al . 1998) . I

t i s generally foun

d o n sand y substrat anea

r rocks , kel p holdfasts , or other bottomstructure s (Lov e 1996) . One-year-ol d individual s ca n b e greater

tha n 8 0 c mS L (Allen et al . 1990) . Halibu

t ca n liv e t o 3 0 y r

(Frey 1971) , wit

h 50 % o f female s matur

e b y 4 yr an d 100 % matur

e b y 7 yr (Lov e an dBrook s 1990) . The

y ar e oviparous , producin g planktoni c egg s an dlarva e (Od a1991 ; Mose

r 1996 ) wit h externa l fertilizatio n (Allen 1990) . Halibut ca n spawn year-round , wit

h pea k spawnin g takin g plac e durin g th e lat e winte r t o sprin g an

d usually i n wate r shallowe r tha n 7 5 m(Lavenber

g e t al . 1986) . Spawning fo

r th e fish unde

r natura l environmenta

l condition s wa s investigate di n th e laborator

y durin g thre e differen

t spawnin g year s (Caddell et al . 1990 ; Tabl e 5.2.11-9) . The y foun d durin g thei r

laborator y stud y tha t halibut spawned 5 7 millio n egg s pe r yea r i n a n artificia l environmenta

l setting . Littl e information o

n th e populatio n dynamic s o f larva l Californi ahalibut

wa s foun d i n th e scientifi c literature . I

n souther n California , halibut

les s tha n 1 0 c mS L are foun

d i n greate r number s i n bay s tha n i n coasta l water s (Plumme

r e t al . 1983) . Pea

k densitie s o f

Californi ahalibut larva e occurre ddurin g Februar

y i n CalCOF I sample s (Mose

r et al . 1993) . Mose

r an d Watso n (1990 ) foun

dtha t les s tha n 1 % ofth e halibut

larva e within th e CalCOF

I stud y are awer e collecte d i n th e centra

l Californi azon e tha

t extend s fro

mjus t nort h of Poin t Conceptio n t o jus t

nort h o f Sa n Francisc o Bay . Alle

n an dJense n (unpubl . datai

n Alle n e t al . 1990) state d tha

t newl y settle d larva e ar e about 8-1 2 m man dabout 3 0 dold . Krame

r (1990 ) state d tha

t halibut 6-1 0 m mlarva e
TENER A E9-055. 0 5-37 2 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2.1 1 Flatfishe s

Summary

of Field Collections

Within th e DCP

P stud y grid , Califomi ahalibu t

larvae occurre d sporadicall y durin g th e tw o year s surveye d(Appendix H) , wit h thei r highes t densitie s occurrin g durin g April-May and Jul y 199 8 (Figur e 5.2.11-9) . N o clea r distributio n patter

n wa s observe d i

n th e grid . Th e densit

y estimate s fro mth e stud

y gri drepresente d25 1 larva l Californi ahalibut

identifie d fro

m16 4 bong o ne

t subsamples : 5 % ofth e stud y gri dsubsample s collecte d an d processed .

TENERA E9-055. 0 5-37 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0 

# I I grew <0. 3 mm/d , whil e large r 70-12 0 m

mhalibu t grew about

1. 0 mm/d . I n alaborator

y study , halibu t hel da t 16° C grew t o alengt

h o f 11. 1 m m± 2.6 1 (SD ) i

n 2 m o froma n initia l hatch lengt

h o f 1. 9 m m(Gadomsk

i et al . 1990) . Instantaneou s mortalit y rate s (Z , ) wer

e greates t fo r th e m smalles t lengt h classes , followedb y lower , relativel y stabl e rate s fo r subsequent

lengt h classe s u

p t o 7 0 m m(Tabl e 5.2.11-10) . | I n th e 1985-198 8 commercia l catch , 63 % ofth e Californi ahalibut wer e 6- 7 y r (Sunad ae t

al . I 1990) . Fis h ove

r 8 y r average dabout

18 % ofth e catch , whil e afe w 3 y r fish wer e larg e enough t o b e include di

n th e fishery . N o stock

assessment

ha s yet bee n publishe d fo

r thi s specie s (Bob Leos , CDF&G , Monterey , pers . comm.) . 

# I t 1 f Californi ahalibu t

larva e wer e collecte d seasonall y i

n th e DCP P intak e entrainment

survey s durin g th e year s 1996-199 9 (Appendix H) . Halibu t larva e at th e intak e occurre d i

n tw o periods : March-May andJuly-Augus t (Figure 5.2.11-8) . Th e greates t apparen t densitie s occurre d durin g late Apri l 1998 . There wer e 37 8 Californi ahalibu t

larvae identifie d from15 7 bong o ne t M subsample s collecte da

t di e DCP P intak e structure between Octobe r 199 6 an d Jun e 199 9 representin g 3 % ofth e entrainment subsample s collecte d and processed . 

# I

I I 

# 1
Standar dlength s o f

Californi ahalibut

larvae collecte d a

t th e DCP P intak e structure range d fro

m• 1. 5 m mt o 8. 0 m

m(Figure 5.2.11-10) . Th e growt h rate o f larva l Californi ahalibut

(0.2 8 mm/d ) reporte db y Allen e t al . (1990 ) wa s used t o estimate age s o f entraine d larvae . Th e centra l 98 % o f • thi s larva l length-frequenc y distributio n resulte d i n minimu man d maximu mlength s fo

r th e analyse s o f

1. 6 m man d7. 8 mm , respectively . Th e mea n larva l lengt h i n thi s distributio n wa s •



# I I5.2.1 1 Flatfishe s

3.2 8 m man dapproximately 6 dpost-hatch . Reported hatchin g siz e fo r Californi ahalibut

range s l .5-1. 8 m m(Mose r 1996, ) an di t i s one ofth e smalle

r larva e entraine d a

t DCPP . Th

e collectio n o f jus t afe w Californi ahalibut

larva e fro mth e paire d entrainmen

t an d stud y grid survey s preclude dstatistica

l comparison s o f

larva l lengt h (Figure 5.2.11-11) . Estimating

Total Annual Entrainment Annua l estimate dentrainmen

t o f Californi ahalibut

larva e wa s greate

r i n 1997-9 8 Analysi s Perio d2 (E- = 14,300,000 ; SE = 2,130,000 ) tha

n i n 1996-9 7 Analysi s Perio d 1 ( E ^= 2,270,000 ; SE

= 296,000 ) (Tabl e 5.2.11-11) . Thes e estimate s represen t atota l o f only 37 8 individua l larva l Californi ahalibut

collecte d a

t th e DCP P intak e structure . Although th e numbe r o f larva l Californi ahalibut

entraine d wa s low i

t wa s chosen fo

r assessmen

t becaus e ofit s importanc e i

n spor t an dcommercia

l fisheries. Estimate dannua

l entrainmen

t o f Californi ahalibut

larva e wa s adjusted (Tabl e 5.2.11-12 ) t o th e long-ter maverag e inde

x ( 7 //, ) estimate d fro

mIntak e Cov e surfac e plankto n tow s (Figure 5.2.11-12) . Th e index wa s calculate d a s th e rati o between th e nin e yea r averag e (J

) o f Intak e Cov e samplin g an

dth e averag e annua

l inde x estimate d fro

mth e plankto n tow s durin g th e yea r bein g adjuste d( I,) . Th e averag e indice s fo r th e year s 1997 an

d 199 8 (I,) wer

e 0.000 5 an

d 0.001 6 larvae/m^ , respectively . The long-ter maverag e inde

x ( 7 ) wa s 0.001 7 larvae/m ^ fo r th e year s 1990-1998 , yieldin g th e rati o 7/7 , o f 3.64 fo r 1997 an d 1.1 0 fo r 199 8 indicatin g tha

t Intak e Cov e densit

y i n thes e year s wa s lowe

r tha n th e long-ter

maverage . Annua

l adjusted entrainment

o f Californi ahalibut

larva e wa s estimate d t o b e 8,260,000 i n 1996-9 7 Analysi s Perio d1 (SE

= 1,080,000) an

d15,700,000 i

n 1997-9 8 Analysi s Perio d 2 (SE = 2,340,000 ) (Tabl e 5.2.11-12) . NOTE : Annua

l entrainment

estimate s o f

Californi ahalibut

larva e wer e not use d t o estimate FH or AEL becaus e no larva

l surviva l datawer e availabl e to parameteriz e thes e models . However , a n approximat

e FH estimat e i s mad e i n th e interpretatio n section below .

TENER A E9-055. 0 5-37 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 6 5.2.1 1 Flatfishe s Empirical

Transport

Model (ETM ) Monthly estimate s o f

proportiona

l entrainment

(PE,) fo r Californi ahalibut

i n each rth survey fro mth e tw o year s sample drange d fro maminimu

mo f zer o t o amaximu

mo f 0.859±0.9 l l (±\SE(PE, ) J

) i n Apri l 199 9 (Tabl e 5.2.11-13) . Durin g period s whe n n o larva e wer e collected a

t either th e DCP P intak e o r fro mth e stud

y grid , bot h th e annua

l proportio n o f

larva e hatche d i

n th e rth survey perio d(f) an dPE, wer e equa l t o zero . Whe

n PE, = 0 bu

t f>0, larvae were collecte da

t th e DCP P intak e durin g th e survey perio d but no t durin g di e entrainment

survey paire d wit h th e 72-hour

stud y gri dsurvey . The maximu mPE,, recorde d i

n Apri l 1999 , wa s th e resul t o f usin g stud

y gri destimate s based only o n inshor e volume s a s n o larva

e wer e foun d i n stud y gri dcells . Tha

t is , PE fo r thi s survey perio d wa s calculate d usin g th e larva l densit y from di e weekly entrainment

sampl e (Appendix H ) multiplie d b y th e unsample d volume inshore o f th e tw o cell s neares t

th e intak e (D l an d El ) t o approximat

e th e numbe

r o f larva e withi n thi s volume . Th e produc t

wa s adde dt o th e abundanc e i n cell s D l an d El , zer o i

n thi s cas e a s wel l a s elsewhere i

n th e grid , t o approximate th e numbe r o f larva e i n th e whol e stud

y grid . Th e low valu e o f / durin g Apri l 199 9 indicate dtha t Californi ahalibut

wer e no t a s prevalent

a s the y were durin g Augus t

199 8 o r March 1999 . I

n compariso n wit

h PE, amont

h earlier , thei r

distributio n wa s mor e inshor e durin g Apri l 1999 . Estimate s o f

P M showe dgreater

difference s between year s tha n between larva

l duration s durin g th e sam e yea r (Figure s 5.2.11-13) . Sinc e halibut larva e wer e disperse d throughout

th e study grid , P s wa s calculate dusin g bot h onshor e an d alongshor

e current movement s wit

h acommo n slop e usedfo r offshor e extrapolatio n o f

stud y gri d abundanc e o f

0.0000252/

mfo r Analysi s Perio d 3 an d 0.0000127/

mfo r Analysi s Perio d 4 . Using offshor e extrapolatio n o f

stud y gri d abundanc e patter n followedb y alongshore extensio n yielde d arang e o f P M fro mbot h analysi s period s o f 0.07-0.08 % (1997-1998 ) and5-12 % (1998-1999 ) ofth e larvae containe d i n apopulatio n are a approximatel y 4 t o 3 9 time s th e stud y gri d are a(and 4 t o 3 5 time s th e grid' s estimate d larva l populatio n size) . I

n comparison , P

M result s usin g only alongshor e extensio n o f

stud y gri d abundanc e als o reflecte ddifference s betwee n th e years ' results , rangin g fro m0.3-25 % ofth e

TENERA E9-055. 0 5-37 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 7 5.2.1 1 Flatfishe s larva e i n a n are atw o t o si x time s th e stud y grid alongshor

e or around 41-10 5 k

mo f coastlin e distance . Interpretation

of Assessment

Results Californi ahalibut

hav e bot h commercia

l an d recreationa

l fishery value . Commercia l vessel landin g price s i

n 199 8 fromport s betwee

n Sa n Dieg o an

d Mendocin o totale d $2,746,70 0 representin g 532. 1 M

T (PSMFC PacFI

N database) . During th e sam e year , landing s i

n th e Morr

o Ba y are atotale dabou

t 10 % ofth e catch fro

mthi s large

r are a(54. 8 MT an

d $264,000 ; PSMF

C PacFI N database) . I

n 1998 , recreationa

l fishers i n souther n Californi acaugh

t 66,00 0 adult Californi ahalibut

(PSMF C RecFI N database) . Th e estimate dag e o f

larva l Californi ahalibut

entraine d a

t DCP P average d six day s wit

h a maximu mestimate dag e o f

2 2 d . Th e averag e duration , combine d wit h current mete r data , produce da

n extrapolate dreferenc e populatio n tha t ranged from4- 8 time s th e stud y are abetwee

n samplin g years , whil e th e maximu mduratio n produced areferenc e populatio n containe d i n a n are a23-3 9 time s th e stud

y grid . Th e populatio n containe d withi n th e stud y gri d an d extende d alongshor e usin g curren

t meter dat aan d bot h averag e an

d maximu mlarva l ag e a t entrainmen

t range dove

r shorelin e distance s o f

10-17 0 km . Therefore , w e assumed tha t th e commercia

l catch likely affectedb

y entrainment

wa s limite d t o th e loca

l port s o f Morr o Ba y and^Por t Sa n Luis . Estimate s o f

stoc k siz e or adult densit y tha t could b e use

dt o conver

t P M number s o f

adult fishes wer e no t availabl e fo

r thi s species . However , proportiona l losse s predicte d b

y ETM can b e applie dt o th e 1993-199 9 averag e valu e ofth e loca l catch o f $161,000/yr

(PSMF C PacFI N Database ) assumin g no compensation . Thus , th e proportiona l dolla r los s t o thi s fishery i

n th e Morr o Ba y are acouldrang e fro

mca . $120-20,00 0 base

d o n P M rangin g fro

m0.00076-0.12 3 fro mth e combinedoffshor

e extrapolate d an

d alongshor

e extensio n ofth e stud

y grid abundance . Between-yea

r difference s i

n larva l Californi ahalibu

t densit y a t DCP P could b e th e result

o f change s i n nearshore , coasta

l transpor t processe s or

ma y reflec t som e other factors . Relatively higher abundanc e observe di

n th e stud y grid durin g the 1997-9 8 E l Niii o even

t ma y hav e bee n
TENER A E9-055. 0 5-37 6 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2.1 1 Flatfishe s 

# I

du e t o increase d shorewar d transpor t a t DCP P (ou t ofth e south ) or

coul d b e relate d t o suppresse d m upwellin g durin g tha

t period . However , th e nin e year s o f Intak e Cov e plankto n to w dataindicat e tha t larva l Californi ahalibut

densit y doe s no t

var y greatly fro

mth e long-ter

maverag e wit

h th e * • exceptio n of asingl e stron g year-clas s i n 1992 . Additionally , catche s i n th e MBNM S appea

r to b e relativel y stabl e o r

only slightl y decreasin g between 1980 an d 199 5 (Star

r e t al . 1998) ; loca

l Morr o Ba y are acatche s sho w asimilarl y stabl e catch betwee n 199 3 an d 199 9 (Figur e 5.2.11 - 14) . One explanatio n fo

r th e apparent

between-yea

r difference s o f

entrainment

effect s i s hig

h interannua

l variabilit

y withi n th e stud

y perio d du e t o low sampl e size : onl y 37 8 Californi ahalibut larvae wer

e collecte d ove

r th e cours e ofth e study . The larg e 1998-9 9 estimate d larva l mortalit y i s base d o n alimite d numbe

r o f Californi ahalibu t

larvae . 

# I

I I i i I

„ Am.= , . = y iemaie s m S *PT 

### 0.5 6 

### x(4.9xl0 6 

### )xf^ j |



# I i I i 1 I l

TENER A E9-055. 0 5-37 7 Fina l 316(b ) Demonstratio n ' Marc h 1,200 0 

# I Usin g th e adjuste d entrainment estimate d over

1996-97 , a

n estimate o f

FH ca n b e made assumin g arelativel y smal l larva l surviva l o f 0.5/ d durin g si x days , averag e yearl y fecundit y o f 4. 9 millio n egg s (Tabl e 5-2.11-9) , an d reproductiv e lif

e o f 11. 5 y r a s £T> pAdj-T

8.3x 1 Q 6 FH = „ A.= -. r- = 9 female s
A n estimate similarl y ca

n b e made fo

r 1997-9 8 a s 1 8 females . Thes e small adul t femal e losse s indicate tha

t whil e P

M i s larg e fo

r 1998-99 , di e populatio n impac t i s probabl y slight .P.9 9 5.2.1 1 Flatfishe s Tabl e 5.2.11-1 . Lif

e tabl e fo r speckle d sandda

b (C. stigmaeus) coverin g th e probabl e lifespan , wher

e x i s the ag e i

n months , bx

th e numbe

r o f egg s spawned pe

r femal e withi n th e interva l an dlx th e numbe

r survivin g a

t th e star t ofth e interval . Separat

e lx column s ar

e give n fo r th e 1962-6 3 an

d1963-6 4 surviva

l data . Value s o f

Z x fo r ag e grou p 3 wer e estimate db

y assumin g th e sam

e mortalit y rat e fo r ag e 2 an d 3 fish. Intrinsi c rat

e of natura l increase , intrinsi c birt

h an d mortalit y rate , an d generatio n length , based o n thes e data , ar

e give n fo r 1962-6 3 an

d1963-6 4 (Tabl e 2 5 i

n For d 1965) . Lif e stage/Ag e (yrs ) Egg s an d larva e 0
1

2

3 Ag e

j (mo ) 0- 3 3- 6 6- 9 9-1 2 12-1 5 15-1 8 18-2 1 21-2 4 24-2 7 27-3 0 30-3 3 33-3 6 36-3 9 39^1 2 42-4 5 bx 0

0 0 0 3,50 0 70 0 0 0 1,01 0 2,00 0 0 0 1,860 3,70 0 0 1962-6 3

lx 100,00 0 15 0 8 2 4 5 4 4 4 2 4 1 4 0 3 3 2 7 2 2 1 8 1 4 1 2 1 0 1963-6 4

Z x 100,00 0 15 0 8 7 5 1 3 8 2 9 2 2 1 6 1 2 8 6 4 3 2 1 Surviva l 0.0015 0 0.56 3 0.56 7 0.86 1 0.85 9 0.86 7 0.85 1 0.78 8 0.74 2 0.78 2 0.74 2 0*76 4 0.76 2 0.66 7

TENER A E9-055. 0 5-37 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.10 0 5.2.1 1 Flatfishe s Tabl e 5.2.11-2 . Estimate dtota l annua l entrainment

(E T ) an d standar d erro r ( SE(E r ) ) fo

r sandda b (Citharichthys spp. ) larva e fro mth e thre e analysi s periods . Analysi s Perio dEjSE(E,) 1 ) Oct 23 , 1996-Sep 30 , 199

7 7,160,00 0 702,00 0 2 ) Oct . 1,1997-Se p 30 , 199 8 1,540,00 0 283,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 6,610,00 0 704,00 0

Tabl e 5.2.11-3 . Estimate d numbe r o f egg s spawned pe

r seaso n b y speckle dsanddab s (Citharichthys stigmaeus) collecte d durin g Apri l an dMa y 196 3 (For

d 1965 )
Tota l lengt h 85. 0 90. 5 109. 5 110. 5 129. 0 130. 0 148. 0 Tota

l #matur e an d maturin g egg s 4,30 0 4,10 0 15,20 0 9,00 0 20,90 0 23,60 0 30,80 0

TENER A E9-055. 0 5-37 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0