r f „. - . -.., p. 1
5.2. 4 Rockfishe s

a )



### b)
c C D C O c C D 5 0 4 0 3 0 C D "5 3 

### E 1 o $ c C O C O 

### E 2 0 10 1 Morr o Ba y Area : KG B rockfis h comple x PSMF C PacFI N Groundfis h Landing s (al l gea r types ) 7 0 -

_ * 6 0 widln$c « 4 0 - c 3 0 - I 2 0 0 1 0 - 0 - , 

# • — i — , T ;-: H DS
. carnatus OS. chrysomelas US. a tro virens

1 — ;Pr

! : - 1 : e.;.'2v-* L '

Yea r KG B rockfis h comple x (Sebastes spp . V_De/V_D_ )



## ^_Vr^V"^ f 

## - ' ^ **"• \"\*& mHm 

## J*f* mmm 

## • -^>\ ' i 1 1 1 1 1 1 r 7 8 8 0 8 2 8 4 1 — 1 — \ 1 1— 1 1—1—1—1—1—1— 1 r 8 6 8 8 9 0 9 2 9 4 9 6 9 8 Plan t Start-u p Yea r 

### Figur e 5.2.4-7 . Yearl

y abundanc e of

KG B rockfish comple

x measuredb

y tw o independen

t methods : a ) Commercia

l fishery landing s o f

adult s fromMorr

o Ba y are aand , b ) Mea

n numbe r of adult s an d YOY observe d pe

r 50-mete r subtida l benthi c transec t

i n the DCP P RWM P Sout h Contro l area . Splin

e smoothin g algorith muse dt o fit curv e throug h points .

TENER A E9-055. 0 5-18 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 2 5.2. 4 Rockfishe s

^ ^ U J C O T
_ + E % J > </ > c u Q C O C O 2 0.2 5 T 0.24 - 0.2 3 ~ 0.2 1 T 0.20 - 0.19 T 0.18 - 0.17 - 0.16 - 0.15 - 0.14 - 0.13 - 0.12 - 0.1 1 - 0.10 - 0.09 - 0.0 8 - 0.07 - 0.06 - 0.05 - 0.04 - 0.0 3 - 0.02 1 0.0 1 - 0.0 0 -

• designatessurve •nirim t Blu e rockfis h comple x (Sebastes

spp . V / S
. mystinus)

I iU..i.*iiL V)Y(Tn . rnn?mT i l i. ) | | .k.lti» ) ^_ M . 1 m , , t • » |o|N| D | J |F|M|A|M|J | J|A|S|O|N|D|J|F|M|A|M|J|J|A|S|O|N|O|J|F|M|A|M| J j | ise e | iss 7 | im e | iso s | Surve y Dat e y wit h densit

y = 0 ,
Figur e 5.2.4-8 . Weekl y mea n larva l densit y (#/m 3 + 1 S.E. ) a

tth e DCP

P intake .

TENERA E9-055. 0 5-18 4 Fina l 316(b ) Demonstratio n Marc h 1.200 0m

z m m o i n c n

C O O l

3 22 . w £ • g > 

# 1 1

- »• * N ) C O o s- . o o O 3 Blu e rockfis h comple x (Sebastes spp . V & S
. mystinus)

C O 

# E 0.8

8 0.7 7 0.6 6 0.5 5 0.4 4 0.3 3 0.2 2 0.1 1 0.0 0

Dept h Contour s

•" 2 0 meter s
• 4 0 meter s •BB B 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 5.2.4-9a . Mean larval density (#/m 5 ) collecte d in th e DCP P study gri d cell s an d a t th e entrainmen t

samplin g location . O l R > 7) o o X 2 1 ( A 3 " O ' C A

T J

C Om

z m m c o 6 c n O l b

o o O )

3 2 1 c o

. 2 "c r 2 O

• ^ * r o c o o « o o o 3 Blu e rockfis h comple x (Sebastes spp . V & S
. mystinus)

CO 

# E 0.8 8 0.7 7 0.6 6 0.5 5 0.4 4 0.3 3 0.2 2 0.1 1 0.0 0

Dept h Contours 2 0 meter s

—4 0 meter s mmmm 6 0 meter s Poin t Bucho n
DCPP 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 5.2.4-9b (continued) . Mea n larva l densit y (#/m 3 

### ) collectedi

n the DCP P stud y gri dcell s and a

t the entrainmen

t samplin g location . c n/

m z m m C O • o O l U l o

C D

3 ffl. C O

w g 

# § 1

- A C O r o c o o -t. o o O 3 Blu e rockfis h comple x (Sebastes spp . V & S
. mystinus)

C D 

# E 0.88

0.7 7 0.6 6 0.55 0.4 4 0.3 3 0.2 2 0.1 1 0.00

Dept h Contour

s !• • 2 0 meter

s - ^ —4 0 meter

s M B M 60 meter

s Poin t Bucho n
DCP P Intak

e

Poin t San 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 5.2.4-9 c (continued) . Mea n larva l density (#/m 3 ) collecte d in th e DCP P stud y gri d cell s an d at th e entrainmen t

samplin g location .m

z m m C O o c n O l

C O 0 0

3 92. c o a> "c ?

- * C O • ^ * r o c o O = : o o O 3 Blu e rockfis h comple x

(Sebastes

spp . V & S
. mystinus)

C O 0.8 8

0.7 7 0.6 6 0.5 5 0.4 4 0.3 3 0.2 2 0.1 1 0.0 0

Dept h Contour s 2 0 meter s

— —40 meter

s H M 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 5.2.4-9 d (continued) . Mea n larva l densit y (#/m 3 

### ) collectedi

n the DCP P stud y gri dcell s and a

t th e entrainmen

t samplin g location . c n K J Ti o o 7V 3 1 C A 3 * CD . C O5.2. 4 Rockfishe s P. 7

C U o c 

## g o > . u c c u 3 C T 0 C C U c u a . Blu e rockfis h comple x (Sebastes spp . V / S
. mystinus) N = 2,40 7

nJMedia n

I 2 . 1 3 . 6 4. 1 Lengt h Categor

y (mm ) i • i • r - '

i ' i ' r - - ' i ' i ' i i i r~ O 2 A e S 1 0 1 2 1 4 1 6 «"•»• • Estimate d age (days

) Figure 5.2.4-10 . Lengt

h frequenc y o f all measured larva

l fish 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 .

TENER A E9-055. 0 5-18 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 8 5.2. 4 Rockfishe s

15 "

1 0 '

C D O C 5- I C O 3 O o O Blu e rockfis h comple x (Sebastes spp . V / S
. mystinus) Entrainment : N=44 3 Mediarfrvlea n Mi n 1 %

-tfU^ L 99 %

" 15 - 

### c C D 3 C T C D
" - 10 " c C D O —Mi n

C D 5 — 1. 9 2. 4 2. 9 3. 4 3. 9 Grid : N=2,15 9 MedianMea n Ma x

4. 4 4. 9 *° ^

1 % 

# ..lll l 99 % 

# h i Ma x

PPP^ ^ 1. 9 2. 4 2. 9 3. 4 3. 9 4. 4

Lengt h Categor

y (mm ) ' T TT T 4. 9 <o**

Figur e 5.2.4-11 . Lengt

h frequency o f

measured fish fro

m entrainmentsurvey s tha tpaired 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 scal e i s notcontinuou s a tlarge r lengths . TENERA E9-055. 0 5-19 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P. 9
5.2. 4 Rockfishe s

<^« * UJ C O 1 +

% • • 3 E , 2 ? C O c C D Q C O C D 2 0.1 2 — o. n - E 0.1 0 ~ E o.os- E : 0.0 8 — : 0.0 7 —

. 0.O6- Z 0.0 5 —

- 0.0 4 — 0.0 3 — 0.0 2 ~ i 0.0 1 — o.oo— - i

Blu e rockfis h comple x (Sebastes spp . V / S
. mystinus) 

# I i : ."... " J 

# I J 

# I I I I i i i i i i 199 0 199 1 199 2 199 3 199 4 199 5 199 6 1997 Yea r i i 199 8

Figure 5.2.4-12 . 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 Cov e surfac e plankto n tows . The annua l mea n densitie s ar

e basedo n seve n consecutiv e month s ofdat a(Decembe r through June ) excep t fo r 1990 , which ha

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

TENER A E9-055. 0 5-19 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 0 5.2. 4 Rockfishe s Blu e rockfis h complex (Sebastes spp . V/S . mystinus)

- mea n duratio n Analysi s Perio

d 3 : Ju l 1997-Ju n 199 8 R » atonoshor * 90 % Cl . Estimat e
P w = 0.0033 8 Pu = 0.00095510.070 0

3 8 x e o s k m 4 0 x Slz a o f Ropulatlo n Ralattv a t o Stud y Orl d Equivalen t Distano a Alonaahor e Blu e rockfis h comple x (Sebastes spp . V/S . mystinus)

- mea n duratio n Analysi s Perio

d 4 : Ju l 1998-Ju n 199 9

90 % Cl .

a x B T K m 10 x 1 S x

17 4 k m 26 1 2 0 x 3 4 7 k m 2 6 x 30 x 30 x 40 x

4 3 4 k m 62 1 k m SO S k m 6B 6 k m Slz a o f Ropulatlo n Relativ e t o Stud y Orl d Equivalen t Dlatano a Alongahor a Figur e 5.2.4-13a . Tota

l annua l entrainmentmortalit

y (/£ ) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal ofth e fraction ofth e populatio n a trisk an d containe d i n th e stud y gri d ( i> s ) use d t o approximat e th 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 an

d th 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

tmovement s wit h 90 % CI.' s indicated . TENER A E9-055. 0 5-19 2 Fina l 316(b) Demonstratio n Marc h 1,200 05.2. 4 Rockfishe s p.1 1

Blu e rockfis h comple x (Sebastes spp . V/S . mystinus) - maximu m duratio n O.SS O - 0.48 6 - 0.44 0 o.sss - 0.33 0 — 0.27 6 - 0.22 0 0.166 - 0.110 - O.OS8 - o.oo o — R s along>hor e Analysi s Perio d 3 : Ju l 1997-Ju n 199 8 Densit y Extrapolate d Ps

of f scal e 1/P s = 42. 1 PM = 0.00045 6 ±0.070 0

Estimat e 90 % Cl . =>» » = 0.0046 8

O x S x 10 x IS x 20 X 2S X SO x 3S X 40 x O k m B 7 k m - . 17 4 km., - 26 1 k m 34 7 k m 43 4 k m S2 1 k m SO S k m 69 6 k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongahor a Blu e rockfis h comple x (Sebastes spp . V/S . mystinus) -maximu m duratio n o.sso -

o.oo o — Analysi s Perio d 4 : Ju l 1998-Ju n 199 9 Density Extrapolate d Ps of f scal e 1/P s = 60. 0 PM-0.0035 6 ±0.057 6

Estimat e 90 % Cl .

O x O k m S x

8 7 k m 1 0 x 1 S x

1 7 4 k m 26 1 k r 2 0 X 2S x SO x 3S x 40 x 3 4 7 k m 43 4 k m 62 1 k m 60 8 k m 6S 6 k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongahor a Figur e 5.2.4-l3b . Tota

l annua l entrainmen

tmortalit y (P^) an

d 90 % confidenc e interva l (CI. ) a s a functio n ofth e reciprocal ofth e fraction ofth e populatio n a trisk an d containe d i n th e study gri d (j^ ) use d t o approximat e th e alongshor e exten tofth e study gri d populatio n expande d o n th e basi s o f alongshor e curren

tmovements an

d th 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 cunen tmovements wit h 90 % CI.' s indicated . TENER A E9-055. 0 5-19 3 Fina l 316(b ) Demonstratio n Marc h 1 , 200 0P.1 2 5.2. 4 Rockfishe s

a )
14 0 p 12 0 S w 10 0



### b ) Morr o Ba y Area : Blu e rockfis h comple x

PSMF C PacFI N Groundfis h Landing s (al l gea r types )

M U > e c 3 •o o J 4 0 E o C J 8 0 - 6 0 2 0 OS. miniatus US. crameri US. mystinus

-+- ^mm 

# J J

199 3 199 4 199 5 199 6 Yea r 199 7 199 S

Blu e rockfis h complex (Sebastes spp . V/S . mystinus)
o C D C O c C O 0 ) afra * C D E I o i n c C O C D E 

### Figur e 5.2.4-14 . Yearl

y abundanc e o f

blue-rockfis h complex measuredby tw o independen t methods : a ) Commercia

l fisher y +landing s o f

adult s fromMorr

o Ba y are aand , b ) Mea

n numbe r of adult s an d YOY observe dpe

r 50-mete r subtida l benthi c transec t

i n th e DCP P RWM P Sout h Control area . Splin

e smoothin g algorith muse dto fi t curve throug

h points .

TENER A E9-055. 0 5-19 4 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 5 Painte d Greenlin g



### 5.2.5 Assessment

of Painted Greenling

(Oxylebiu s pictus )

Oxylebius pictus Gill 1862 ; painte d greenling ; lengt h to 2 6 cm ; Princ e Willia m Sound , Alask

at o Isla s Sa

n Benito , centra

l Baj aCalifornia ; intertida

l t o 9 4 m ; grayis h t o brown , sometime s whit e spotted ; throa

t usually spotte d an

d thre e dar k band s radiat

e fro meye ; dar

k spot s o n caudal , pectora

l an d pelvi c fins (Miller an dLe a1972 ; Eschmeye

r et al . 1983 ; Love 1996) . The painte dgreenlin g (Oxylebius pictus) i s amembe r ofth e famil

y Hexagra mmidae , which i s foun dexclusively i

n th e norther

n Pacifi c Ocea

n (Nelso n 1994) . Thre e ofth e fou r subfamilie s occu r alon g th e Californi acoast : Hexagrammina e (on e genus , Hexagrammos), Ophiodontina e (on e species , Ophiodon elongatus), an d Oxylebiina

e (on e species , O. pictus; Nelso n 1994) . Painte dgreenlin g ar

e solitar y bottomdweller s tha

t inhabit the intertida

l zon e dow

n t o depth s o f 94 mamong o

r nea r cobbl e an dboulde r substrata , tendin g t o mingl e wit h th e benthi c flor

ai n area s of surg e (Miller

an dLe a1972 ; Burg e an

d Schult z 1973 ; Eschmeye

r et al . 1983 ; Love 1996) . Crustacean s an

dpolychaete s ar

e importan

t foo d item s (Burg e an

d Schult z 1973 ; Love 1996) . I n turn , painte dgreenlin g ar e a n importan

t foo d ite mo f Brandt' s cormoran

t (Lov e 1996) . Painte dgreenlin g wa s one ofth e mos t commo n fish i n survey s o f

Diabl o Cov e an

d th e vicinit

y i n 1970 an d197 1 (Burg e an

dSchult z 1973) . I n souther n Californi athe

y ar e mos t abundan t a t depth s rangin g fro

m1 5 to 3 1 m , bu

t i n centra l Californi ath e pea

k distributio n move s inshor

e to a rang e o f 5 to 2 2 m(Lov e 1996) . Painted greenlin g ar e territoria l an d see mto hav e high sit

e affinit y (Lov e 1996) . Painte dgreenlin g ar

e oviparou s an

d la y adhesiv e batche s o f

demersa l egg s o n exposed roc

k surface s wit

h low lying algae , wit

h male s guardin g th e egg s (Fitch an d Lavenber

g 1975 ; Lov e 1996) . Report s ofth e spawning perio d an d duratio n var

y among source s wit

h Mose r (1996 ) reportin g spawnin g activit

y fro mOctober-Jul y an

d Fitch an d Lavenber

g (1975 ) indicatin g TENER A E9-055. 0 5-19 5 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 5 Painte d Greenlin g

spawnin g take s plac e February-November . Female s collecte d fro m Diabl o Cov e an

d th e surroundin g area i

n May an d Septembe r containe d developin g an d matur e egg s (Burg e an

d Schultz 1973) . Female s spaw n thre e time s during a 3 m o (summer ) seaso n i n Puge tSoun d an

d a t leas tthre e time s ove r 7 m o (September-March ) i n Montere y Bay , Californi a (DeMartini an d Anderso n 1980) . Th e numbe r o f egg s produce d annuall y range s fro m ca . 12,000-28,50 0 (DeMartin i an

d Anderso n 1980 ; Lov e 1996) . Larvae ar e planktoni c an

d can remain in th e wate r colum n fo r 1- 3 m o (DeMartin i an d Anderso n 1980 ; Mose r 1996) . Th e larvae transfor m t o juvenile s a

ta siz e o f approximatel y 1 5 m

m (Kendal l and Vinte r 1984) . Scientifi c literatur

e give s n o estimate s o f

natura l mortalit y rate s fo r eithe r earl y lif e stage s o r late r (juvenil e o r adult) stage s o f painte d greenling . Mortalit y rates hav e notbee n calculate d fo r adults usin g age-frequenc y analyse s becaus e ag e distribution s i n th e population s sample d wer e no t stationar y (DeMartin i an

d Anderso n 1980) . Hatchin g succes s per brood ranged fro m 3 1 % ± 9 % t o 72 % ± 6 % (DeMartin i 1987) . Laborator y mortalit

y rates durin g th e yolk-sa c stag e fo r anothe r famil y member , th e greenlin g (Hexagrammos otakii), wer e calculate d fro m survival curve s a s 0.001-0.00 3 (Hamai an

d Kyushi n 1964) . Survival rates a tth e en d ofth e yol k absorptio n perio d ranged fro

m 13 % t o 38% . Durin g th e feedin g perio d ofth e larvae , th e mortalit y rat e (0.018-0.083 ) depend s o n temperature , with highe r temperature s conespondin g t o highe r mortalit y rate s (Hamai an

d Kyushi n 1964) . Thes e laboratory-derive d mortalit y rate s wer e measure d in th e absenc e o f natura l mortalit y (e.g. , predation ) and , therefore , wer e no tappropriat e t o us e a s th e larva

l mortalit y rate s o f painte d greenling . Longevity an

d ag e a tmaturatio n o f

painte d greenlin g appear t o var y wit h location . Thei r longevit y wa s estimate d a t8 y r fro m a 17 3 m m tota l lengt h (TL ) specime n collecte d i n th e vicinit y o f

Diabl o Canyo n (Burg e an d Schultz 1973) . I

n Montere y Bay , Californi a th e maximu m longevit y wa s estimate d a s 5 y r a t16 0 m m T L fo r male s an

d 6 y r a t175 m m T L fo r females . Fis h i n PugetSound ha

d a maximum longevity o f 6 y r a t20 0 m m TL fo r male s an

d 8 y r a t21 5 m m T L fo r female s (DeMartin i an d Anderso n 1980) . Ag e a t50 % maturit

y wa s 3 y r fo r female s an d 2 y r fo r male s i

n Montere y Ba y (DeMartini 1976 ; DeMartini an d Anderso n 1980) .

TENER A E9-055. 0 5-19 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 5 5.2. 5 Painte d Greenlin g Painte dgreenlin g hav e limite dfishery value . The y ar e typicall y taken incidentally b y recreationa

l an dcommercia

l fisherie s whil e targetin g othe r fishe s (Fitch an

d Lavenber

g 1975 ; Love 1996) . Thu s ther e ar e n o stock assessment s o

r catc h record s wit

h whic h to compar

e losse s attributabl e to powe r plan t entrainment . 

### 5.2.5. 1 Summar

y of Fiel d Collection s Painte dgreenlin g larva

e wer e collecte d almos t

yea r roun da t th e DCP P intak e structur e durin g th e year s 1996-199 9 (Appendix H) , wit h their highes t abundanc e occurrin g i

n lat e Marc h an d Ma y 199 7 (Figure 5.2.5-1) . It

appear s there wer

e fewe r painte d greenlin g larva

e durin g 199 8 tha n durin g eithe

r 199 7 o r 1999 , especially durin g Februar y an d Marc h 1998 . Thi s migh

t have bee n du e t o th e E

l Nin o even

t tha t wa s detecte d alon g th e centra l Californi acoas t

i n th e fal l o f 1997 (Lyn n et al . 1998 ; NOA

A 1999) . Ther

e wer e 1,13 3 larva

l painte d greenlin g i

n 55 3 bong o ne t subsample s collecte da

t th e DCP P intak e structur e betwee n Octobe r 199 6 an d June 1999 representin g 12 % ofth e subsample s collecte d an d processe d fro

mtha t location durin g tha

t period . Painte dgreenlin g larva

e occurre di

n th e DCP P stud y grid durin g mos t

month s except

Septembe r 1997 , an dAugus t an dSeptembe

r 199 8 (Appendi

x H) . The highes t

densit y occurre d durin g Ma

y an dJune 1999 (Figure 5.2.5-2 ) an d i n th e grid cell s closes t

t o shore . Ther

e wer e 37 2 larva

l painte dgreenlin g identifiedfro m26 1 bong o ne

t subsample s representin g 9 % ofth e stud y grid subsample s collecte dan

dprocesse d fro

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

all painte dgreenlin g larva e collecte d a

t the DCP P intak e structur e betwee n Octobe r 199 6 an dJune 1999 ranged fro

maminimu

mo f 2. 1 m mto amaximu

mo f 7. 9 m m (Figure 5.2.5-3) . Th

e centra l 98 % o f thi s length-frequency distributio n resulte d i n minimu man d maximu mlength s fo

r th e analyse s o f

3. 2 m man d 5. 2 mm , respectively . Th e mea n larva l lengt h i n thi s distributio n wa s 4. 1 mm . The growt h rat e o f larva l painte d greenlin g (0.08 3 mm/d) reporte db y Freema n e t al . (1985 ) wa s use

d to estimat

e age s o f entraine d larvae . W

e assumed tha

t th e shortes t

larv aofth e centra

l 98 % ofth e length-frequency distributio n wa s immediatel y post hatch an dagedzer o days . Consequently , th e estimate d age s o f larva e entraine d ranged fro

mzer o TENER A E9-055. 0 - 5-19 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 6 5.2. 5 Painte d Greenlin g day s u p to 24-7 0 dpost-hatchin g fo r th e larges t

larva e measured . O

n average , th e estimate d age s o f painte dgreenlin g larva

e entraine d a

t DCP P range d fro

m10-2 4 dpost-hatching . Reporte d hatchin g siz e fo

r painte dgreenlin g i s les s tha n 3. 5 m m(Mose r 1996) . The fac

t tha t w e observe d some larva

e smaller tha n th e reporte d hatchin g length s ma y b e partl y explaine d b

y natura l variatio n o f

hatch length s withi n th e populatio n an d partly b y th e phenomeno n o f

shrinkag e followin g preservatio n (Theilacker 1980) . Significan t difference s wer

e detecte d between mea

n length s (/-test : p < 0.041 ) an d between length-frequenc y distribution s (Kolmogorov-Smirno v test : p £ 0.002 ) o f larva l painte d greenlin g fro mth e DCP

P intak e structure an

d stud y gri d despite th e appearanc e o f similarit y between th e tw o distribution s (Figur e 5.2.5-4) . Th e mea n standar d length s fro

mth e intak

e an d stud y gri d wer e 4. 1 m man d4. 0 mm , respectively . Th e maximu mdifferenc e betwee

n th e length-frequenc y distribution s detecte dby th e Kolmogorov-Smirno v goodnes s offit tes t occurre d a

t 4. 1 mm , indicatin g tha

t smalle r individual s wer

e collecte d fro

mth e DCP

P intake . Whil e thes e difference s wer e statisticall y detectabl e andsignificant , w e believ e tha t th e biologica

l significanc e ofthes e difference s wa s low . 

### 5.2.5. 2 Estimatin g Tota l Annua l Entrainmen t Th e annua l estimate dmea

n entrainment

fo r painte d greenlin g larva

e range d fro

maminimu

mo f 8,410,00 0 (SE

=800,000 ) i

n Analysi s Perio d 2 t o amaximu mo f 22,000,00 0 (SE

=1,600,000 ) i

n Analysi s Perio d1 (Tabl e 5.2.5-1) . Value s of 2-SE(E T ) ca n b e used t o approximat

e 95 % confidenc e interval s aroundth e point estimates . Thes e value s fo r Octobe r 1996-September

1997 an d Octobe r 1997-September

199 8 would not

overlap , indicatin g tha

t th e difference s betwee

n themi s statisticall y significant . Estimate s o f

Annua l estimate s o f

entraine d painte d greenlin g larvae adjusted t o along-ter mmea n base do n annua l indice s usin g weekly Intak e Cove surfac e plankto n tow s (Figure 5.2.5-5 ) range d fro maminimu

mo f 9,610,00 0 (SE

=914,000 ) i

n Analysi s Perio d 2 t o amaximu mo f 24,200,00 0 ( SE =1,760,000 ) i

n Analysi s Perio d 1 (Tabl e 5.2.5-2) . The averag e inde x fo r th e year s 199

7 an d 199 8 wer e 0.002 3 an

d0.002 2 larvae/m^ , respectively . The long-ter maverag e index wa s 0.002 5 TENER A E9-055. 0 5-19 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 7 5.2. 5 Painte d Greenlin g larvae/m 3 fo

r the year s 1990-1998 , yieldin g the rati o (7/7, ) of 1.099 0 fo r 199 7 an d 1.14 3 fo r 199 8 an dindicatin g tha

t larva l greenlin g abundanc e wa s lowe r tha n th e long-ter

maverag e durin g 1997 an d1998 . Th

e adjustmen

t increase d th e difference s betwee n th e estimate s fo

r Analysi s Period s 1 an

d2 . NOTE : Entrainmen

t estimate s fo

r painted greenlin g wer

e no t use d t o calculate FH

or AEL model s becaus e no demographi c data(e.g. , larva l survivorship ) wer

e availabl e to parameteriz e thes e approaches . 

### 5.2.5. 3 Empirica l Transpor t Mode l (ETM) Monthly estimate s o f

proportiona

l entrainmen

t (PE,) i n eac h rth survey fro

mth e tw o year s sample drange dfro

maminimu

mo f zero t o amaximu

mo f 0.0423±0.039 3 (±\SE(PE i j ) i n Februar y 199 8 (Tabl e 5.2.5-3) . Thi s maximu mPE, wa s no

t associate d wit

h th e maximu

mf t (0.252 ) which occurre di

n Jul y 1997 an

d thu s wa s proportionally les s importan t durin g tha

t analysi s period . N o larva

e wer e collecte d a

t eithe r th e DCP P intak e o r fro mth e stud

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

larva e presen t i n th e rth surve

y perio d (Jj) wer

e equa l to zero . Whe n PE j= 0 but Jj>0, it indicate d tha

t larvae wer

e collecte d a

t th e DCP P intak e durin g th e surve y perio dbu

t not durin g th e entrainment

survey paire d wit

h th e 72-hou

r stud y grid survey . Durin g th e Analysi s Perio d3 , th e highes t PE, ' s wer

e al l approximately 0.04 , but

onl y Januar y 199 8 ha darelatively larg e f t weightin g facto

r (0.17 ) whic

h mean t i t ha d proportionall y greate

r influenc e o

n th e annua

l entrainmen

t mortalit y estimate . I

n Analysi s Perio d 4 , one ofth e lowes t PE, value s carrie dthe greates t weightin g facto

r j=0.23 . Estimate s o f

P M betwee n analysi s period s an

d fo r bot h larva l duration s ar

e relativel y simila

r an d range dfro m0.032-0.06 7 (Figure 5.2.5-6) . Sinc e painted greenlin g larva e wer e disperse d throughout

th e stud y griddurin g mos t

survey s (Figure 5.2.5-2) , P s wa s calculate d using alongshor e curren t movemen t an dextrapolatin g stud

y grid abundanc e offshor

e usin g onshor

e current movement . The estimate s calculate d usin g offshor e extrapolatio n o f

stud y gri d abundanc e wer e als o simila

r betwee n th e tw o analysi s period s an d tw o larva

l duration s an

d ranged fro

m 0.004-0.011 . Estimate s o f

P M fo r bot h analysi s period s using either mea n or maximu mlengt h i n TENER A E9-055. 0 5-19 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.1 8 5.2. 5 Painte d Greenlin g calculatin g larva

l duratio n either

decline d ar

e remaine d approximatel y th e sam e whe n MP s increased . 5.2.5. 4 Interpretatio n o f Assessmen t Result s Painte dgreenlin g ha s ver

y littl e commercia

l or recreationa

l fisher y value . Becaus e ofth e absenc e o f any commercia

l fisher y fo r thi s species , there ar

e n o catch dat ao r

stock assessment s wit

h which t o compar

e entrainment

mortalit y rate s (P

M ) . Result s ofth e ETM

modelin g sho w tha

t th e powe r plan t ma y annuall y entrai n approximatel y 4-5 % ofth e painte d greenlin g larvae ove r a n are a6 t o 7 time s th e are aofth e stud y gri d (Figure 5.2.5-6) . Abundanc e o f

adul t painte dgreenlin g wa s examine d usin g dat afro mth e DCP

P Receivin g Wate

r Monitorin g Progra

mstudie s o

n subtida l fishe s (Figur e 5.2.5-7) . Ther e wa s considerabl e variatio n i n greenlin g abundanc e ove r th e perio d o f

observatio n wit

h one obviou s declin e i

n abundanc e fro m199 2 throug h 1994 . Thi s ma y hav e resulte d fromth e extende d E l Nin o event s tha

t occurre d fro m199 1 throug h 199 3 (Yoklavic h et al . 1996 ) an

d again i n 199 4 (NOA A 1999) . Annua

l mea n densit y o f painte dgreenlin g larva

e fro mIntak e Cov e surfac e plankto n tow s sho w high larva l productio n i

n 199 2 an d1995 , but

n o coherent

trend s (Figure 5.2.5-5) . Th e absenc e o f any evidenc e o f

long-ter meffect s (> 5 yr ) on painte d greenlin g abundanc e fromthes e tw o source s indicate s tha

t entrainment

o f larva e by th e power

plan t CW S i s only removin g exces s larva l productio n tha

t doe s no t affect loca l adul t abundanc e o r

larva l production . Th e lac k o f evidenc e o f

declinin g trend s i

n adul t abundanc e or

larva l productio n coul d als o b e th e resul t o f compensatio n fo

r th e additiona

l larva l mortalit y resultin g fro

mentrainment . If

, a s reported , painte dgreenlin g larva e transfor minto juvenile s a

t asiz e o f 1 5 m man d ar e planktoni c fo r 1- 3 m o (DeMartini an

dAnderso n 1980 ; Mose

r 1996) , then ou

r result s indicate tha

t th e larva e are only subjec t

t o entrainment

fo r aver y limite d perio d oftime . Th e mea n ofth e siz e frequenc y distributio n fo

r entraine dlarva

e wa s 4. 0 mm , an

d 99 % o f all th e larva

e range d fro

m3. 2 to 5. 3 m m(Figur e 5.2.5-3) . The perio doftim e represente d b y thi s siz e rang e i s much les s tha n th e reporte dlarva

l duratio n (up t o 9 0 d ) an

d ma y even b e shorter

if , a s suspected , th e lowe

r size s represent variatio n i

n hatch size . Onl

y one larv awa s collecte d tha t wa s withi n th e rang e o f TENER A E9-055. 0 - 5-20 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0FM 9 5.2. 5 Painte d Greenlin g Moser' s (1996 ) reporte dlengt h a t flexion (7- 9 mm) . The absenc e o f flexion an d post-flexio n lengt h larva e i n the sample s ma

y indicat e tha t mor e develope d larva

e ar e abl e to avoi d captur

e o r tha t behaviora l change s result

i n th e larva e moving ou

t ofth e plankto n an

d int o othe r habitat s wher e the y ar e not subjec t t o captur e or entrainment . Thes e observation s ma y als o indicat

e tha t painte dgreenlin g larva

e quickly settl e ou

t ofth e plankto n an

d ma y have mechanism s i

n late r stage s tha t compensat

e fo r mortalit y o f planktoni c larva

e sinc e ther

e do not appea r to b e decline s i n larva l abundanc e through time .

TENER A E9-055. 0 5-20 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 0 5.2. 5 Painte d Greenlin g Tabl e 5.2.5-1 . Estimate dtotal annua l entrainment

(E T ) an d standar d erro r ( SE(E T ) ) fo r painte dgreenlin g (Oxylebius pictus) larva e fro mth e thre e analysi s periods . Analysi s Perio dE T SE(E T

) 1 ) Oct 23 , 1996-Sep 30 , 1997 22,000,00 0 1,600,00 0 2 ) Octl , 1997-Sep30 , 199 8 8,410,00 0 800,00 0 3 ) Jul 1 , 1997-Ju n 30 , 199 8 11,100,00 0 970,00 0

Tabl e 5.2.5-2 . Estimate dtota l annua l adjusted entrainment

(E Adj

_ T ) an d standar derro r ( SE(E

AdJ

_ T ) ) fo r painte d greenlin g (Oxylebiuspictus) larva e fro mth e thre e analysi s periods . Analysi s Perio dE Adj

_ T SE(E MJ

_ T ) 1 ) Oc t 23 , 1996-Sep 30 , 1997 2 ) Octl , 1997-Sep 30 , 199 8 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 24,200,00 0 9,610,00 0 12,100,00 0 1,760,00 0 914,00 0 1,110,00 0

TENER A E9-055. 0 5-20 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 1 5.2. 5 Painte d Greenlin g
Tabl e 5.2.5-3 . Painted greenlin g (Oxylebius pictus): Monthl y estimate s o f

proportiona

l entrainmen

t (PE, ) an

d annua l proportio n o f

larva e hatched i

n th e rth survey perio d (J t) an d associate d standar

d error s (SE) used 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 PE, SE 

## (V) ft

b ) Analysi s Perio d 4 : Jul y 1 , 1998-Jun e 30 , 199 9 Surve y Star t Dat e PE, SE(PE,) 

### ft SE(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 0.0089 4

0.0095 4 0 0.039 8 0.0075 1 0.012 5 0.040 5 0.042 3 0.036 1 0.0044 0 0.0078 0 0.016 2 0.0059 3

0.013 4 0 0.047 4 0.010 6 0.014 4 0.020 6 0.039 3 0.025 5 0.0034 1 0.0031 8 0.0051 5 0.25 2

0.032 9 0 0.031 0 0.019 1 0.033 3 0.170 3 0.029 6 0.034 5 0.10 1 0.08 9 0.20 7 0.01 6

0.004 6 0 0.004 1 0.003 7 0.005 0 0.011 8 0.003 5 0.004 4 0.011 2 0.007 5 0.012 3

SE ( / ) 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 ,

TENER A E9-055. 0 199 8

199 8 199 8 199 8 199 8 199 8 199 9 199 9 199 9 199 9 199 9 199 9 0.0028 5

0 0 0 0 0.0074 1 0.015 3 0.018 1 0.011 6 0.0092 4 0.0099 7 0.0074 7 0.0030 5

0 0 0 0 0.0082 7 0.0047 8 0.0046 4 0.0036 2 0.0045 0 0.0033 8 0.0020 8

5-20 3 0.026 2

0 0 0 0 0.010 8 0.12 4 0.16 8 0.23 6 0.077 5 0.23 3 0.12 5 0.0036 6

0 0 0 0 0.0019 6 0.0049 9 0.0056 2 0.0096 0 0.0052 4 0.0096 2 0.0060 1

Fina l 316(b ) Demonstratio

n Marc h 1,200 0P.2 2 5.2. 5 Painte d Greenlin g

U J 0 3 T - + rt E ^ > ~ *ity </ > c c u Q c C O (1 ) 2 0.038 - 0.03 6 - 0.034 - 0.03 2 ~ 0.030 - 0.02 8 ~ 0.02 6 ~ 0.02 4 - 0.02 2 - 0.02 0 ~ 0.018 - 0.016 - 0.014 - 0.012 - 0.010 - 0.008 - — 0.006 - 0.004 - 0.002 - o.ooo Painte d greenlin g (Oxylebius pictus)

IIIIIIIII I

M A TTTTTTn i M I J I Surve y Dat e T designatessurveywithOensity= 0

Figur e 5.2.5-1 . Weekl y mea n larva l densit y (#/m3 + 1 S.E. ) a

t th e DCP

P intake .

TENER A E9-055. 0 5-20 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 3
5.2. 5 Painte d Greenlin g

. O Q . c o

. 3 C D "5 , x O C. "c. c u C D •o " c C O 0 _ \ \ \ \ \ \ \ \ \ \ 0)ONtDIOV«Nr P OOOOOOOOO O oooooooo° o 

## ,W/ # § o " E 8 £Dep mter o E 8

_ 

# 1 0 1ter a > E 

### s

- 

# 1 C Oter C D E 8 m 

# 1 > »

C • o

e e C N i IT ) C N 1/ 5 ( U L . 3 0J 5 TENER A E9-055. 0 5-20 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 4 5.2. 5 Painte d Greenlin g

c o o = J C Q c p tt)



### "f t c Q L 0 . O Q

e o J 3 " o Q . C O

. 3 C D 

# a C " c c u cu u . O ) • o


### . 2 " c 'r e Q . \ \ \ \ \ \ \ \ \ \



## § os(oin»nNE O ooooooo'- 3 ' ^ ooooo o 

# .w/# £ o "E O

. cDep C

O & fc 

### s 

# 1 0 > s a > b 

### s 

# 1 c a & b 

### s 

# 1 CO

C C U T 3 c a e a

• a C U B e w C N i V J C N V. s U l TENER A E9-055. 0 5-20 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0m

z m m C O i o 0 1 t n

O -v l

3 S L w an t r 

## 2 ° t o § 

## § 1 r o 5 3 o s- . o o O 3 Painte d greenlin g (Oxylebius pictus)

C O 

# E 0.09 9 0.08 8 0.077 0.06 6 0.05 5 0.04 4 0.03 3 0.022 0.01 1 0.00 0

Dept h Contour

s 2 0 meter s

—— » 4 0 meter s ^"" » 6 0 meter s Poin t Bucho n
DCPP Intak

e

Poin t San 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 5.2.5-2c (continued) . Mea n larva l densit y (#/m 1 

### ) collectedi

n th e DCP P stud y grid cell s an

d a t th e entrainmen

t sampling location . c n r o c n T J 0> C O O . O 

### S C O 5' , C D


### I N >

O lr

n z r n m c o 6 c n c n b



## V r o o o o

3 9 L C J

_ ^ "c r

-f c (/ > t o C O o =r . o o o 3 Painte d greenlin g (Oxylebius pictus)

C D 

# E 0.09 9 0.08 8 0.07 7 0.06 6 0.05 5 0.04 4 0.03 3 0.02 2 0.01 1 0.00 0

Dept h Contour

s

—— —20 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 5.2.5-2d (continued) . Mea n larva l densit y (#/m 3 

### ) collectedi

n the DCP P stud y grid cell s an

d a t the entrainmen

t sampling location . 9 C O c aP.2 7 5.2. 5 Painte d Greenlin g

Painte d greenlin g (Oxylebius pictus) N=96 3 1 5 —

-Occurrence0IIIIIII

" oFrequencyIIIIII

0) 5 — o _ c u 0 .

— M i n

• M-l l Media n lif e



# 1 

# l H Mea n B9< K



# I Hill . ! •
_ 2 . 0 2. 5 3. 0 3. 5 4. 0 4. 5 S. O 5. 5

L(
c jngt h Categor

y (mm )

...,, . 1 1 • i * ' ' i ' • * i • • . i • • • , . • 5 4 B 1 2 16 . 2 0 2 4 2 8 Estimate d age (days

) Vla x

4,* X

• i i i i Figure 5.2.5-3 . 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 .

TENER A E9-055. 0 5-20 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 8
5.2. 5 Painte d Greenlin g

15 "

10 "

U c C O
3 o u O i "

« 15 - C C D 3 cr 0 ) *• 10 " c C O o w cu Mi n Painte d greenlin g (Oxylebius pictus) Entrainment : N=10 7 1 % Mi n Mea n

IIIII I Media n 99 % Ma x

I'• rI I I » » I I | •ITMl " I ' I I ' ' ' ' I 2. 3 2. 8 . 3. 3 3. 8 4. 3 4. 8 5. 3 5. 8 6. 3 Grid : N=17 8 Median l Mea n 1 % 

# il l 99 %



# III , I,.,,I , Ma x



## 44I L ' I ' ' • TJ^TT^J^"^7'TX X , ,1. , , | ,-P , , |-P>1"P | 2. 3 2. 8 3. 3 3. 8 4. 3 4. 8 5. 3 5. 8 6. 3

Lengt h Categor

y (mm )
Figur e 5.2.5-4 . Lengt

h frequenc y o f

measure d fis

h fro mentrainment

survey s tha

t paire d wit h gri d 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 scal e i s no t continuou s a

t large r lengths . TENER A E9-055. 0 5-21 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.2 9 5.2. 5 Painte d Greenlin g

L U C O 1 + • l» > E 5| ,DensityMean 0.01 2 — o.o n - E o.oi o — 0.00 9 ~ o.oo s - E 0.007- E o.oo e - E 0.00 5 - E 0.00 4 - E 0.00 3 - E 0.00 2 - E 0.00 1 - E o.oo o — Painte d greenlin g (Oxylebius pictus)

- 1

• IIIII I 199 0 199 1 199 2 199 3 199 4 199 5 Yea r 1

199 6 •

1 i 199 7 l

199 E I

Figur e 5.2.5-5 . Annua

l mea n density +/ - 2 standar

d error s (vertical lines ) an

d gran d mea n density fo r al l year s combine d (horizontal line ) fo r th e Intak e Cov e surface plankton tows . The annua l mea n densitie s ar

e based o n seve n consecutiv e month s ofdat a (Decembe r throug h June) excep tfor 1990 , whic h ha d onl y fiv e month s (Februar y throug h June) .

TENER A E9-055. 0 5-21 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 0 5.2. 5 Painte d Greenlin g Painte d greenlin g (Oxylebius pictus) - mea n duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8 P a alongshor e Estimat e 90 % Cl . Danalt y Extrapolate d R a P M = 0.0087 7 ±0.052 1

S l i » o f Populatio n Relativ e t o Stud y Orl d Equivalen t Olstano a Alongahor a Painte d greenlin g (Oxylebius pictus) - mea n duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % Cl .

8lz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Olatano a Alongahor a Figur e 5.2.5-6a . Tota

l annua l entrainmentmortalit

y (p^) and 90 % confidenc e interva l (C.I. ) a s a functio n ofth e reciproca l ofth e fractio n ofth e populatio n atrisk an d containe d i n th e stud y gri d (/£ ) use d t o approximat e th e alongshor e exten tofth e stud y gri d populatio n expande d o n th e basi s o f alongshor e curren

tmovement s and Ui

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

d alongshor e curren

tmovement s wit h 90 % CI.' s indicated . TENER A E9-055. 0 5-21 2 Fina l 316(b ) Demonstratio n Marc h 1.200 05.2. 5 Painte d Greenlin g P.3 1

Painte d greenlin g (Oxylebius pictus) - maximu m duratio n
P 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 = 47. 8 Pu- 0.0091 0 ±0.057 5

Estimat e 90 % Cl
.

Slx e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Painte d greenlin g (Oxylebius pictus) - maximu m duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9 Densit y Extrapolate d Ps

of f scal e 1/P s = 63. 9 Pu = 0.0044 4 ±0.031 0

Estimat e 90 % Cl .

Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Oiatano a Alongahor a Ll
_ Figure 5.2.5-6b . Tota

l annua l entrainmen

t mortalit y (/£ ) and 90 % confidenc e interva l (CI. ) a s afunction ofth e reciproca

l ofth e fraction ofth e populatio n a t ris k an d containe d in th e stud

y gri d (p.) 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 an

d th e offshor

e extrapolatio n o f

stud y gri d abundanc e extende dalongshor

e usin g bot

h onshor e an d alongshor

e current movement s wit

h 90 % CI.' s indicated . TENER A E9-055. 0 5-21 3 Fina l 316(b ) Demonstratio n Marc h 1 , 200 0P.3 2

O < D C O c C O "S J E I o li t c C O c u E 5.2. 5 Painte d Greenlin g

i 1 1 1 1 1 1 n— i 1 1 1 1 1 1 1 r 7 8 8 0 8 2 8 4 \ 8 6 8 8 9 0 9 2 9 4 Plan t Start-u p Yea r i r 9 6 9 8 

### Figure 5.2.5-7 . Mea

n numbe r o f painte dgreenling s observedpe r 50-mete r subtida l benthi c transec t in th e DCP

P RWM P Sout h Contro l area . Splin

e smoothing algorith

musedto fit

curve throug h points .

TENERA E9-055. 0 5-21 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 3 5.2. 6 Sculpin s 

### 5.2.6 Assessment

of Sculpins

(Family Cottidae) Cottida e i s ascorpaenifor mfamil y tha t comprise s 7 0 gener aworldwid e (Nelso n 1994) . Forty-tw o specie s o f sculpi n occu r

alon g th e Californi acoas t (Mille r an d Le a1972) , primaril y i n intertida l o r shallo w subtida l habitats . Th e ETW G selecte d thre e cotti d specie s fo r assessmen t

in th e DCP P entrainmen t

study : smoothhea d sculpi n (Artedius lateralis), snubnos e sculpi n (Orthonopias triads), an d cabezo n (Scorpaenichthys marmoratus). Intertida l an d shallo w subtida l fishes , includin g th e cottids , displa y awid e rang e o f lif e historie s tha t def y broa d demographi c generalization . Specie s withi n th e famil y Cottida e displa y avariet y o f lif e histor y pattern s rangin g fro mrelativel y short-live dt o longer-live d specie s (Gibso n 1969 , 1982 ; Mille r

1979) . Th e larg e staghor n sculpi n (Leptocottus armatus), commo n in Pacifi c coas t bay s an d estuaries , i s know n t o liv e t o 3 y r an d reac h sexua l maturit y afte r 1 y r (Jone s 1962 ; Tast o 1975) . Th e fluff

y sculpi n (Oligocottus snyderi) an dth e tidepoo l sculpi n (O. maeulosus) hav e shor t

lifespan s an dearl y maturation . Thi s conclusio n i s base d on growth rat e dat acouple d with th e scarcit y o f

individual s olde r

tha n 1. 5 y r

an d o n dat ashowin g earl y maturatio n an d hig h reproductiv e outpu t

fo r fluff y sculpi n (deVlamin g e t

al . 1982) . Cabezon , th e larges t ofth e Nort h America n cottids , ma y liv e 1 3 y r bu t onl y inhabit s tidepool s durin g it s firs t o r secon d yea r

o f lif e (O'Connel l 1953) . Th e demograph y o f cottid s i s no t

wel l known . A detaile drevie w ofth e demograph y o f severa l specie s o f

cottid s closel y relate d t o smoothhea d sculpi n (Artedius lateralis) wil l sho w wh y substitutio n o f earl y lif e histor y characteristic s from relate dtax ai s no t

possibl e fo r

targe t tax afro mth e Cottidae . Begl e (1989 ) propose d a phylogeneti c classificatio n placin g th e gener aOligocottus an d Clinocottus a s th e neares t relative s t o th e genu s Artedius. A s wit h smoothhea d sculpin , sculpin s i n th e gener aOligocottus an d Clinocottus ar e oviparous ; la y demersal , adhesiv e eg g batches ; sho w varyin g degree s o f parenta l car e ofth e eggs ; an dproduc e pelagi c larvae . Thoug h th e demograph y o f local specie s fro mthes e closel y relate d gener a(i.e. , tidepoo l sculpin , fluff y sculpin , an d wooll y sculpi n [Clinocottus analis]) i s simila r i n man y respect s t o tha t

o f smoothhea d sculpin , informatio n necessar y t o comput e AEL an d FH for thi s latte r

specie s i s TENER A E9-055. 0 5-21 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 4 5.2. 6 Sculpin s lackin g (Tabl e 5.2.6-1) . Th e tidepoo l sculpi n achieve s amaximu msiz e o f 8. 9 cm , become s sexuall y matur

e by 1 2 m o (Pierc e an

d Pierso n 1990) , an

d primaril y occur s i

n th e intertida

l zone . Usin g unvalidate dages , Pierc e and Pierso n (1990 ) reporte d mea n annua l fecundit y range s fro

m 103 egg s fo

r a n ag e clas s I femal e t o 69 9 egg s fo r a n ag e clas s II

I female . Th e fluff

y sculpi n als o reache s amaximu

msiz e o f ca . 8. 9 c m(Eschmeye

r e t al . 1983 ) an

d amaximu

mag e o f 1. 5 y r a t Dillo n Beach , Californi a(Freema n e t al . 1985) . It

ma y spawn mor

e tha n onc e durin g it s approximatel y 8 m o reproductiv e perio d (Grossma n an d deVlamin g 1984 ) and i s foun d i n tidepool s an

dshallo w rock

y area s fro mSitka , Alaskat o Ri o Socorro , norther n Baj aCaliforni a (Miller an dLe a1972) . Instantaneou s growt h rate s o f wild-caught

fluff y sculpi n adults , estimate d b y length-frequenc y analyses , varie d betwee n male s and female s and rang e fro m0.06 3 fo

r a n ag e 1 + femal e t o 1.05 9 fo

r a n ag e 0 + mal e (Freema

n e t al . 1985) . Th e wooly sculpin (Clinocottus analis) i s large r an d longe r lived tha n either th e smoothhea

d sculpi n or th e tw o representative s ofth e genu s Oligocottus. I t attain s amaximu

msiz e o f 1 8 c m (Eschmeyer

et al . 1983 ) an

damaximu

mag e o f 8 y r fo r male s an d 6 y r fo r female s (Well s 1986) . Thi s sculpi n i s foun

dfro mth e intertida

l zon e t o 1 8 mdepth s an

d fro mCap e Mendocino , norther n Californi at o PuntaAsuncion , centra l Baj aCaliforni a(Miller

an d Le a1972) . I

t spawn s i n tidepool s a

t Poin t Fermin , souther

n Californi afro

mSeptembe

r throug h November . Young-of
the-yea r (YOY ) recrui t

t o tidepool s i

n souther n Californi afro

mNovembe

r t o Februar

y (Well s 1986) . Eg g incubatio n take s ca . 18-3 0 d i n th e laborator

y (Eigenman

n 1892 ; Bud

d 1940 ; Hubb s 1966) . Well s (1986 ) indicate s tha t al l specimen s ove

r 6 0 m mT L an d betwee n zer o an d 1 y r o f ag e appea r sexuall y matur

e wit h batch fecundit

y describe d b

y the linea r functio n F= l 1.6TL

620. 6 (n=45 ; r=0.940 ; P<0.01) . Male s o f thi s specie s appea

r to gro w faste

r an d to alarge

r siz e tha n female s (Well s 1986) . Th e larges t female collecte d (11 0 mm ) containe d 78 4 eggs ; th e mea n numbe r o f egg s wa s 24 2 pe

r averag e reproductiv e femal e (7 4 mm ; Well s 1986) . Numbe r o f spawn s pe r seaso n i s unknown , bu

t multipl e spawn s ar

e implie d b

y tri-moda l siz e distributio n o f ov apresen

t i n gonad s (Well s 1986) . Base d o n Bud d (1940 ) examinin g wool

y sculpin an

d Morri s (1951 ) examinin g baldsculpins , 11-2 5 m mfishe s wer

e surmise d to b e newl

y settle d fro

mth e pelagi c larva

l phas e an dhatche dapproximately 6- 8 w k prior (Well s 1986) . Despit

e thes e lif e
TENER A E9-055. 0 5-21 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 5

• 7 - i 5.2. 6 Sculpin s

histor y descriptions , there ar

e n o estimate s o f

larva l survivorship wit

h whic h t o parameteriz e th e FH or AEL model s fo r member s ofth e Cottidae . 

### 5.2.6. 1 Smoothhea d sculpi n (Artedius lateralis)

Artedius lateralis (Girar

d 1854) ; smoothhea

d sculpin ; lengt

h to 1 4 cm ; Kodia

k Island , Alaskat o Cab o Sa

n Quintin , northemBaj aCalifornia ; intertida l t o 1 3 m ; greenis h t o brow

n o n top , crea mto ligh t brow n belo w (Mille

r an d Le a 1972 ; Eschmeye

r et al . 1983) . The smoothhea

dsculpin i s acommon nearshore , intertida l cotti d (Miller

an d Le a1972) . Spawning varie s betwee

n locations : winter-sprin g i n Britis h Columbi a(Marliav e 1977 ) an d June i n Puge t Soun d(Matares e e t

al . 1989) . Thei

r egg s hatch into pelagi c larva e i n about 1 6 d a t 15.5° C (Bud

d1940 ; Matares e et

al . 1989) . Larva

e o f thi s specie s hav e bee

n collecte d i

n DCP P entrainmen

t sample s nearly year-roun d (Figure 5.2.6-1) . Lov e (1996 ) indicate s tha t thes e sculpin s likel

y matur e withi n thei r

firs t yea r o f lif e an d probably liv e a s long a s 3 yr . Th e demographi c dat aavailabl e fo r smoothhea

d sculpin an

d it s clos e relative s (Tabl e 5.2.6-1 ) d o no t provid e sufficien t information to comput

e AEL o r FH. Estimate s o f

fecundit y an d spawning periodicit y ar e availabl e fo

r closely relate d specie s tha

t likel y compar e favorabl y wit h A. lateralis base do n their simila r ecologica l roles , adult

habitats , an

d clos e phylogeneti c relationships . However , i

n th e absenc e o f

an y estimate s o f

eg g or larva l survivorship , FH

or AEL canno t b e computedfo

r thi s species . Recreationa

l an dcommercia

l fisherie s do no

t target most smal l intertida l an d shallo w subtida

l cottids . Thi s i s one reason tha t the literatur

e o n thes e specie s i s limited . Th e absenc e of

an y

TENER A E9-055. 0 5-21 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 6 5.2. 6 Sculpin s populatio n estimate s fro

mfisher y managemen

t plan s o r other source s wil l mak

e assessment

o f impact s o n th e smoothhea

dsculpin populatio n difficult . Summary

of Field Collections

- Estimate s o f

smoothhea

dsculpi n larva

l abundanc e showe d distinc t seasona l peak s a t th e DCP P intak e structure durin g th e year s 1996-199 9 (Appendi x H) , wit h greates t abundanc e occurin g between Apri l an

dJul y (Figure 5.2.6-1) . Ther e were 5,59 8 larva

l smoothhea

d sculpi n identified fro m1,32 0 bong o net

subsample s collecte d at

th e DCPP intak

e structure between October 199 6 an dJun e 199 9 representin g 28 % o f th e sample s collecte dan

d processe d fro

mth e intak

e structure durin g tha t period . Wit

h th e exceptio n o f

on e ver y high pea k densit y i n Apri l 1998 , th e distributio n o f

abundanc e andmagnitude o f densit y di d no t appea r t o b e differen

t between 199 7 an d 1998 . Althoug h only entrainment survey s that

wer e paire d wit

h stud y gri d survey s wer

e processe dafte

r Septembe

r 1998 , th e abundanc e pattern s appea r t o b e simila

r t o previou s years . Larva l smoothhea

dsculpin generall y occurre d wit h simila r seasonalit y i n th e DCP P stud y gri d and at th e DCPP intak

e structure (Appendix H) . Th e larges t densitie s i

n th e stud y gri d occurre d i n Jul y 1997 , Apri l 1999 , an dMa y 199 9 (Figur e 5.2.6-2) . There wer e 67 6 smoothhea

d larvae identifie dfro

m31 2 bong o net

subsample s representin g 10 % ofth e stud y gri d sample s collecte d an dprocesse dfro

mJul y 1997-Jun e 1999 . Larva l abundanc e appeare d t o trac k th e 2 0 misobath , wit h larvae likel y concentrate dinshor e o f thi s contour

(Marliav e 1986) . Apparently , th e higher 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 fact tha t mor e o f th e are ai n th e souther

n hal f o f th e gri d i s withi n th e 0-2 0 mdept h range . Standar dlength s o f

4,92 9 smoothhea

d sculpi n larva

e measure d fro

msample s collecte d a

t th e DCP P intak e structure betwee

n October 199 6 and Jun e 199 9 range d fro m1. 6 m mt o 11. 8 m

m (Figur e 5.2.6-3) . Th e centra l 98 % o f thi s length-frequenc y distributio n resulte d i n minimu man d maximu mlength s o f

2. 4 m man d5. 3 mm , respectively . The mea n larva l lengt h i n thi s distributio n wa s 3. 1 mm . Reporte dhatch siz e fo r thi s specie s range d fro

m3.9-4. 5 m

m(Moser 1996) . Th e fac t tha t w e observe dsom

e larva e smaller tha n th e reporte d hatchin g length s ca n b e explaine d partl y by natura

l variatio n o f

hatch length s withi n th e populatio n an d partl y b y th e phenomeno n TENERA E9-055. 0 5-21 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 7 5.2. 6 Sculpin s

o f shrinkag e followin g preservatio n (Theilacke r 1980) . The growt

h rate applie d t o thi s specie s (0.0 8 mm/d) fro

mFreema n e t al . (1985 ) wa s use

d to estimat

e age s o f entraine d larvae . Assuming tha t th e shortes t

larva e (eithe r 1.6 or 2. 4 mm ) wer e immediately post-hatch an d aged zero days , th e estimate dage s o f

larva e entraine d could rang e fro

mzero day s u

p to 35-12 3 dpost-hatchin g forth e larges t

larva e measured . Th

e averag e estimate d age s o f smoothhea

d sculpi n larva

e entraine da

t DCP P rangedfro

m9-1 9 d post-hatching . Significan t difference s exis t

betwee n mea n length s (/-test : p < 0.001 ) an d betwee n length
frequency distribution s (Kolmogorov-Smirno v test : p < 0.001 ) o f larva l smoothhea

d sculpi n fro

m th e DCP P intak e structur e an dstud y grid , despite th e appearanc e o f similarit y betwee n th e tw o distribution s (Figur e 5.2.6-4) . The mea n standar d length s fro

mth e intak

e an d stud y gri d wer e 3. 1 m man d3. 7 mm , respectively . Th e larg e sampl e siz e (65 5 larva e fromth e intak

e an d 28 0 larva

e fro mth e stud

y grid ) cause s th e Mes t

t o b e highl y sensitiv e t o small difference s betwee n th e mean s (Za r 1984) . Media

n length s wer

e simila r a t 3. 1 m man d 3. 2 m ma t th e intak e structur e an d i n th e grid , respectively . The maximu mdifferenc e betwee

n th e length-frequenc y distribution s detecte dby th e Kolmogorov-Smimo v goodnes s offi t tes t occurre d a

t 3. 9 mm , indicatin g tha

t mor e larg e individual s wer

e collecte d fro

mth e grid . While thes e difference s wer e statisticall y detectabl e andsignificant , w e believ e tha t th e biologica

l significanc e ofthes e difference s i s low . Estimating

Total Annual Entrainment Annua l mea n entrainment

estimate s fo

r smoothhea

d sculpin larva

e ranged fro

m88,900,00 0 (SE =3,660,000 ) i

n 1996-9 7 Analysi s Perio d 1 t o 96,100,00 0 (SE =9,410,000 ) i

n 1997-9 8 Analysi s Perio d2 (Tabl e 5.2.6-2) . Th e estimate s fo

r 1997-9 8 Analysi s Perio d 3 wer e slightly differen t tha n Analysi s Perio d2 becaus e smoothhea d sculpin larva

e wer e collecte d durin g th e summe r an dfall month s o f

199 7 whe n th e tw o period s di d no t

overlap . Value s o f

2 • SE(E r) ca

n b e use dt o approximat

e 95 % confidenc e interval s around th e poin t estimates . Confidenc e interval s fo

r th e 1996-9 7 an

d1997-9 8 estimate s would overlap , indicatin g tha t th e difference s amon g the mwer e probably no t

significant .

TENER A E9-055. 0 5-21 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 8 5.2. 6 Sculpin s Annua l entrainment

estimate s fo

r smoothhea

d sculpi n larva

e adjusted to along-ter

mmea n based o n annua l indice s usin g weekly Intak e Cov e surfac e plankto n tow s (Figure 5.2.6-5 ) range d fro m 57,700,00 0 (SE

=2,370,000 ) i

n Analysi s Perio d 1 t o 115,000,00 0 (SE=\ 1,300,000) i n Analysi s Perio d2 (Tabl e 5.2.6-3) . Th e averag e index value s fo r 1997 an d 199 8 wer

e 0.073 4 an

d 0.039 7 larvae/m^ , respectively , whil e th e long-ter maverag e index wa s 0.047 6 larvae/m ^ fo r th e year s 1990-1998 , yieldin g th e rati o 111, o f 0.64 9 fo r 1997 , an d 1.2 0 fo r 1998 . Thus , th e adjuste d value s increas e th e difference s between th e 1996-199 7 and th e 1997-199 8 analysi s periods . NOTE : Estimate s o f

FH or AEL fo r smoothhea

d sculpi n usin g annua

l entrainment

wer e no t calculate dbecaus e n o demographi c dat aexist s fo r thi s species . Empirical Transport

Model (ETM ) Monthl y estimate s o f

proportiona

l entrainment

(PE, ) i n th e survey s fro

mth e tw o analysi s period s range dfro

maminimu

mo f zero t o amaximu

mo f 0.0729±0.018 1 (±ISE(PE, J ) i n Jun e 199 9 (Tabl e 5.2.6-4) . Bot

h Apri l an d Jun e 199 9 demonstrate d simila r PE, value s aroun d 0.07 , bu t th e proportiona

l entrainment

estimate i n Apri l ha d greate r weigh t wit h a n annua l proportio n o f larva e hatche di

n th e ith survey perio d (Jj) equa l t o 0.3 0 a s compare d wit

h a n /=0.1 8 fro

m Jun e o f 1999 . Whe

n bot h PE, an dJjwer e equa l t o zero , there wer

e n o larva e collecte d a

t either th e DCP P intak e or th e stud y grid . Whe

n PE, = 0 bu

t Jj>0(e.g. , Sept.-Nov . 1997) , larvae wer e collecte da

t th e DCP P intak e durin g th e survey perio d bu t not durin g th e entrainment

survey paire dwit h th e 72-hou

r stud y gri dsurvey . Th e larges t

value s o f Jjoccurre d Apri l throug h Jun e i n bot h analysi s period s indicatin g tha t thes e wer e time s o f pea k hatchin g fo

r thi s species . Smoothhea

dsculpi n adult s ar

e foun d i n th e shallo w nearshor

e are a(Mille

r an d Lea , 1972) . Stud

y gri d sample s showe dtha

t th e larva e wer e als o distribute d primaril y i n nearshor e area s (Figur e 5.2.6-2) . Therefore , P s wa s calculate d usin g only alongshor e current movemen t t o calculate point estimate s o f

P M . Result s fo

r smoothhea

d sculpi n sho w ho

w larg e difference s i

n estimate d larva

l duration s ( 9 vs . 3 5 d ) ca

n affect estimate s o f

P M (Figure s 5.2.6-6) . Estimate s o f tota l
TENERA E9-055. 0 5-22 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.3 9 5.2. 6 Sculpin s entrainmen t

mortalit y increase d abou t 5 % with increasin g larva l transpor t duratio n i

n bot h period s (Perio d3 , mea n duratio n P u =11 % an d max . duratio n P M =15% : Perio d 4 , mea n duratio n •P M =15 % an d max . duratio n P M =20% ) with th e secon d yea r bein g highe r

overall . Value s fo r P M wer e greate r

in th e secon d analysi s period . Th e probabilit y o f entrainmen t

i s les s fo r

th e shorte r duratio n i

n both analysi s period s becaus e ofth e reduce d tim e ove r whic h larva l transpor t occurred . Estimate s fro mlonge r larva l duration s showe d tha t weake r alongshor e current s resultin g fromth e E l Nin o condition s durin g th e 1997-9 8 analysi s perio d resulte d in alarge r estimat e o f

P s an d smalle r

area s o f inferenc e compare d t o th e 1998-9 9 analysi s period . Interpretation

of Assessment

Results Smoothhea dsculpi n ha s neithe r commercia l no r

recreationa l fishery value , an d ther e i s littl e informatio n o n it s ecologica l rol e in th e community . Becaus e ofth e absenc e o f an y fishery fo r thi s species , n o catc h dat aca n b e use d t o compar e harves t mortalit y rate s t o entrainmen t mortalit y rate s ( P M ) . Ther e ar e als o n o estimate s o f stoc k siz e o r densit y tha t

coul d b e use d t o conver t P M int o a n estimat e o f

adul t equivalen t

loss , assumin g n o compensator y mortality . Annua l mean densitie s o f smoothhea d sculpi n larva e fromIntak e Cov e surfac e plankto n tow s di d no t sho w an y long-ter mtrend s in abundanc e fro m1990-199 8 (Figur e 5.2.6-5) . Althoug h th e estimat e fo r

199 8 i s clos e t o th e long-ter mmea n density , th e dat aoveral l sho w alarg e amoun t o f variatio n amon g years . Th e dat ad o no t provid e an y evidenc e of areductio n i n larval productio n tha t woul d affec t

recruitmen t

an d eventuall y adul t

populatio n density . Trend s i n adul t population s o f smoothhea dsculpi n wer e examine d usin g dat afro mth e DCP P Receivin g Wate r Monitorin g Progra mstudie s o n subtida l fishes . Mea n abundanc e fro mthre e 5 0 mtransect s in a n are a approximatel y 1 k

msouth o f

Diabl o Cov e an d no t

contacte d b y th e plant' s therma l discharg e combin e dat afo r

smoothhea d sculpi n with dat afo r othe r cottid s becaus e ofth e difficultie s i n identifyin g thes e small , crypti c fishe s underwate r (Figur e 5.2.6-7) . Th e dat avar y considerabl y amon g years , bu t

th e fitte dcurv e show s adeclinin g tren d fro m199 2 throug h 1998 . Althoug h thes e dat aar e variabl e th e timin g ofth e apparent declin e i s consisten t

wit h th e life-span (~ 3 yr )

TENER A E9-055. 0 5-22 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 0 5.2. 6 Sculpin s

an d ag e o f sexual maturit

y (-1- 2 yr ) fo r thi s species , sinc e any reduction s i n adultdensity o f smoothhea d sculpi n woul d onl y b e expecte d t o b e detectabl e afte r several generations . Th e size s ofth e majorit

y ofth e entraine d larvae range d fro m 2. 0 m m t o 4. 5 m

m (Figur e 5.2.6-3) . Althoug h larva

e a s large a s 11. 9 m

m wer e entrained , there wer e fe w larvae greate r tha n th e reported siz e a

tflexio n o f

5.0-6. 3 m

m (Mose r 1996) . I

n fact , mos tofth e larvae wer e les s tha n th e maximum hatc

h siz e o f 4. 5 m m reported b y Mose r (1996) . Thi s may indicate tha tsmoothhea d sculpi n larvae ar

e onl y subjec tt o entrainmentove r a limite d perio d o f thei r larva

l development . I

t may als o indicat

e tha tlarge r larvae ar

e avoidin g captur

e o r tha tbehavioral change s resul ti n th e larvae movin g outofth e plankto n an d into othe r habitat

s wher e the y ar

e no tsubjec tt o entrainmento r captur

e usin g ou r samplin g methods . Th e considerabl e variatio n in adultdensities , th e absenc e of a decreasin g trend i n larva l abundance , an

d th e relativel y shor

tdevelopmenta l perio d ove r whic h larvae ar e entraine d indicate s tha

tth e removal o f

approximatel y 10-20 % o f th e smoothhea d sculpi n larva e from a n area 7- 8 time s tha

tofth e stud y grid doe s notnegativel y affec tloca l adul tpopulation s o r larva l abundance . 

### 5.2.6. 2 Snubnos e sculpi n (Orthonopias triads)

Orthonopias triads (Stark s an d Man n 1911) ; snubnos e sculpin ; lengt h t o 1 0 cm . Farallon Islands , norther n Californi a t o Isl a Sa

n Geronimo , norther

n Baj a California ; intertida

l t o 3 0 m ; gree n t o reddish brow n o r orang e above , wit

h dar k an d ligh tmottling ; whit e belo w (Mille r an d Le a 1972 ; Eschmeye r e tal . 1983 ; Lon g 1992) . Despit e th e commo n occurrenc e ofsnubnos e sculpi n i n nearshore rocky subtida l an d intertida

l habitats , thei r lif

e history remain s relativel y undescribed . Female s ar e oviparou s an

d spawn yea r roun d wit h peak s betwee n Februar y an d October . Th e egg s ar

e demersa

l an d adhesiv e an

d hatc h planktoni c larvae (Feene y 1992 ; Mose r 1996) . Boli n (1941 ) conducte d studie s ofth e embryolog y TENERA E9-055. 0 5-22 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 1 5.2. 6 Sculpin s

an ddevelopmen

t o f earl y larva

l stage s o f O. triads i

n laborator

y rearin g experiments . Eg g incubatio n took

16-1 9 da t about 13°C , afte r whic h th e larva

e hatche d a

t size s rangin g from2.9
- 3. 8 mm . Al

l larva e die dwithi n 1 0 d o f

hatchin g despit

e severa l regime s o f

aeratio n an

d nutrition , increasin g by about

0. 2 m mi n lengt h ove r tha t time (i.e. , growt

h rate o f 0.02 mm/d) . Yol

k sac s wer e exhauste db y about

5 d . The growt

h describe d above , representin g th e first 5- 6 do f lif e unti l th e yol

k store s wer

e exhausted , probably underestimate s th e growt h rat e i n th e wil d wher

e the y ca n fee dsuccessfully . The growt

h rat e o f 0.08 3 mm/

d used t o estimate larva

l ag e o f entraine dO. triads i s fromFreema n et al.' s (1985 ) descriptio n ofth e earl y lif e histor y o f another intertida l cotti d(O. snyderi). Th e demographi c dat aavailabl e fo r O. triads do not

provide sufficien

t information fo

r computatio n o f

AEL o r FH. Phylogeneti c analyse s indicat e tha t th e relationshi p o f

O. triads t o sister cottid s foun

di n simila r habitat s remain s unresolve d (Begl e 1989) . Recreationa l an d commercia

l fisheries do no t

targe t small intertida

l an d shallo w subtida

l cottids . Thi s i s on e reason tha t th e literatur

e o n thes e specie s i s limited . I n th e absenc e o f

eg g or larva l survivorship estimates , th e impact

o f entrainment

o n th e smoothhea

d sculpin populatio n will b e assesse dusin g onl y th e ETM. Summary

of Field Collections Estimate s ofsnubnos e sculpin larva l abundanc e showe

d seasona l peak s i n lat e sprin g an

d earl y summe r a t th e DCP P intak e structur e durin g th e year s 1997 an

d 199 8 (Figur e 5.2.6-8) . Ther e wer e 4,53 3 snubnos e sculpin larva e identified fro

m1,42 2 bong o ne

t subsample s collecte d a

t th e DCP P intak e structur e betwee n Octobe r 199 6 an d Jun e 1999 representin g 3 1 % ofth e sample s collecte dan

dprocesse dfro

mth e intak

e structur e during tha

t period . Ther

e appeare d t o b e relativel y compresse dperio do f larva l abundanc e i

n Apri l though Jul y o f

199 8 compared t o a mor e protracte dspawnin g seaso n i n 1997 tha t lasted fro mFebruar y throug h September . Thi s ma y hav e bee n relate dto th e E

l Nin o even

t tha t occurred during lat

e 199 7 (Lyn n e t al . 1998 ; NOA

A 1999 ) a s substantia

l increase s i

n wate r temperature s an

d lowered productivit

y negatively affected

TENERA E9-O55. 0 5-22 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 2 5.2. 6 Sculpin s larva l productio n andsurvival . Monthly sample s collecte d i n 199 9 sho w larva

l densitie s simila

r i n timin g wit

h 1997 . Larva l snubnos e sculpi n generall y occurre d i n th e DCP P stud y gri d wit h simila r seasonalit y t o tha t observe da

t th e DCP P intak e structur e (Appendix H) . Th e 44 7 snubnos e larva e identifie d fro m20 1 bong o net

subsample s represente d 7 % ofth e fishe s collecte d an d processe d fromJul y 1997-Jun e 199 9 stud

y gri dsamples . Thus , snubnos e larva e wer e les s common i

n th e stud y gri d tha n a t th e intak e structure wher

e thei r larva e wer e foun d i n 31 % ofth e samples . Th e pea k abundance s i

n th e stud y gri doccurre d i

n Jul y 1997 (Figur e 5.2.6-9) . Durin g Jul y 1997 an d other surveys , snubnos e sculpi n larva e wer e typicall y mor

e abundan t i n th e nearshor

e area s ofth e grid . Simila r t o smoothheadsculpin , spatia l distributio n o f

larva l snubnos e abundanc e appeare d t o follo w th e 2 0 misobath . Marliav e (1986 ) foun d tha t larvae ofrocky intertida

l and nearshore fishe s ma y resis t offshor e transport , an

d possibly even alongshor

e transport , t o remai n concentrate dagains t

th e shore . Larva

e o f thi s specie s occurre d mor

e ofte n i n th e souther

n portio n ofth e stud y gri dbecaus e mor

e ofth e are ai

n th e souther

n hal f o f th e gri d i s withi n th e 0-2 0 m dept h range . Standar dlength s o f

al l measure dsnubnos e sculpi n larva e collecte d a

t th e DCP P intak e structure betwee n Octobe r 199 6 an dJun e 199 9 (3,75 0 larvae ) range d from1. 7 m mt o 8. 5 m

m(Figur e 5.2.6-10) . Th e centra

l 98 % o f thi s length-frequenc y distributio n resulte d i n minimuman

d maximu mlength s usedfo

r analyse s o f

2. 6 m man d 6. 1 mm , respectively . The mea n larva l lengt h i n thi s distributio n wa s 3. 6 mm . Reporte d hatchin g siz e fo r thi s specie s range d fro

m2.6-3. 8 m

m (Mose r 1996) . Th e fac

t tha t w e observe d som

e larva e smaller tha n th e reporte d hatchin g length s ca n b e explaine dpartl y by natura l variatio n o f

hatc h length s withi n th e populatio n and partl y b y th e phenomeno n o f

shrinkag e following preservatio n (Theilacke r 1980) . The growt

h rate applie d t o thi s specie s (0.0 8 mm/d ) fro mFreema n et al . (1985 ) wa s used t o estimat e age s o f entraine d larvae . Assumin g tha

t th e shortes t

larva e (either 1. 7 or 2. 6 mm ) wer e immediately post-hatc h an d age d zer o days , then th e estimate dage s o f larva e entraine d coul d rang e fro

mzero day s u

p t o 42
- 8 2 dpost-hatchin g fo

r th e larges t

larva e measured . Th e averag e estimate d age s ofsnubnos e larva e entraine da

t DCP P range dfro

m11-2 2 d post-hatching . TENER A E9-055. 0 5-22 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 3 FT* TM 5.2. 6 Sculpin s

Distribution s ofsnubnos e sculpin larva l length s a t th e DCP P intak e structur e an d i n the stud y gri d wer e comparedusin g aKolmogorov-Smirno v tes t (Figure 5.2.6-11) . The tes t did not detec t a significan t differenc e betwee

n th e tw o distribution s ( p > 0.14) . Larva e i n th e stud y gri d showed a bimoda l siz e distribution , wit

h agreate r proportio n o f

large r individual s represente d i

n the gri d relativ e to collection s a

t th e intak e structure . A /-tes t

detecte d asignifican

t differenc e ( p < 0.0134 ) betwee

n mea n length s fo

r th e tw o locations : 3. 5 m

ma t th e DCP P intak e an d 3. 7 m mi n th e stud y grid . The larg e sampl e siz e (38 0 larva e fro mth e intak

e an d 16 1 larva

e fro mth e stud

y grid ) cause s th e /-tes t

t o b e highly sensitiv e t o small difference s betwee n th e mean s (Za

r 1984) . Whil e th e differenc e betwee n th e mean s wa s statisticall y significant , we believ e tha t th e biologica l significanc e ofth e differenc e i s low . Estimating

Total Annual Entrainment Th e annua l estimate dmea

n entrainmen

t ofsnubnos e sculpin larva

e range d fro

maminimu

mo f 59,800,00 0 (SE

=4,120,000 ) i

n 1997-9 8 Analysi s Perio d 2 to amaximu mo f 85,600,00 0 (SE =3,490,000 ) i

n 1996-9 7 Analysi s Perio d 1 (Tabl e 5.2.6-5) . Th e estimate s fo

r 1997-9 8 Analysi s Perio d3 wer

e slightl y differen

t tha n Analysi s Perio d 2 becaus e snubnos e sculpi n larvae wer e collecte ddurin g the summe r an d fal l month s o f

199 7 whe n th e tw o period s did not

overlap . Value s o f 2-SE(E T ) ca n b e usedto approximat

e 95 % confidenc e interval s around th e point estimates . Thes e confidenc e interval s fo r Octobe r 1996-Septembe

r 199 7 an d Octobe r 1997
- Septembe r 199 8 wouldnot

overlap , indicating tha

t th e difference s betwee

n the mwer e probably statisticall y significant . The adjustedestimate s o f

annua l entrainmen

t ofsnubnos e sculpin larva

e ranged fro

m83,500,00 0 (SE =5,750,000 ) i

n 1997-9 8 Analysi s Period 2 to 110,000,000 (S £ =4,480,000 ) i n 1996-9 7 Analysi s Perio d1 (Tabl e 5.2.6-6 ) based o n annua l indice s usin g weekl

y Intak e Cov e surfac e plankto n tow s (Figure 5.2.6-12) . Th e averag e inde

x value s forth e year s 199

7 an d 199 8 ar e 0.02 8 an d0.02 5 larvae/m^ , respectively , whil e the long-ter maverag e inde

x i s 0.03 6 larvae/m 3 fo

r th e year s 1990-1998 , yieldin g th e rati o 111, o f 1.2 8 fo r 1997 an d 1.4 0 fo r 1998 . Th e adjustment s

TENER A E9-055. 0 5-22 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 4 5.2. 6 Sculpin s increase dth e estimate s fo

r all thre e period s bu

t di d no t decreas e th e relativ e difference s amon g them . NOTE : Estimate s o f

FH or AEL fo r snubnos e sculpi n usin g annua l entrainment

wer e not calculate dbecaus e n o demographi c dataexist s fo r thi s species . Empirical

Transport

Model (ETM ) Monthly estimate s o f

proportiona

l entrainment

(PE, ) i n th e survey s fro

mth e tw o analysi s period s rangedfro

maminimu

mo f zero t o amaximu

mo f 0.859±0.91 1 (±\SE( PE, I ) i n Decembe r 1997 (Tabl e 5.2.6-7) . However , thi s maximu mvalu e wa s accompanie d b y arelativel y low estimat

e ofth e annua

l proportio n o f

larva e hatche d i

n th e rt h survey perio d (Jj) indicatin g tha t relativel y fe

w snubnos e sculpi n larva

e wer e collecte d a

t th e intak e durin g thi s month . Whe

n bot h PE, an dJ wer e equa l t o zero , n o larva

e wer e collecte d a

t either th e DCP P intak e or fro m th e stud y grid . Whe

n PE, = 0 bu

t J>0, larva

e wer e collecte d a

t th e DCP P intak e durin g th e monthl y survey perio dbut no t durin g th e entrainment

survey paire d wit

h th e 72-hou

r stud y gri d survey . The larges t

value s o f J, occurre d durin g Apri l throug h Jul y i n bot h analysi s periods . Durin g th e 1996-199 7 analysi s period , th e larges t value s o f PE, occurre d durin g period s whe n th e Jjwer e lowest , indicatin g tha

t th e hig h PE, value s resulte d fromlow entrainment densitie s usedt o estimate abundanc e i n nearshor e area s ofth e stud

y grid . Durin g th e 1997-199 8 analysi s perio dthes e survey s wer

e als o associate d wit

h th e larges t

value s o f PE, . Result s o f ETM fo r snubnos e sculpi n showed how difference s i n estimate d larva

l duration s (1 1 vs . 4 2 d ) ca

n affect estimatio n o f

P M (Figure s 5.2.6-13) . Stud

y gri d sample s showed tha

t snubnos e sculpin larva

e wer e primarily distribute d i

n nearshor e area s (Figure 5.2.6-9 ) despite th e fact tha t adult s hav e bee

n foun dfromth e intertida

l zon e out t o depth s o f

3 0 m(Miller

an d Le a 1972) . Base

do n observe dlarva

l an d reporte d adult

distributions , P s wa s calculate d usin g bot h alongshor e current movemen t an dextrapolatin g stud

y gri d abundanc e offshor

e usin g onshor

e current movemen t befor e extendin g alongshore . The probabilit y o f entrainmen

t wa s typicall y les s fo r th e shorte r duratio n withi n a

n extrapolatio n clas s becaus e ofth e reduced time perio d ove r which larva

l transpor t occurred . Estimate s o f

P M usin g alongshor

e transpor t wer e large r fo r th e TENERA E9-055. 0 5-22 6 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 6 Sculpin s

1998-199 9 analysi s perio d(0.24 : Figure 5.2.6-13b ) tha n fo r th e 1997-199 8 analysi s perio d (0.14 ) an dwer e greate r tha n within-perio d difference s betwee n estimate s based o

n differen t larva l durations . Estimate s o f

P M usin g offshor

e abundanc e extrapolatio n an d maximu m transpor t duratio n wer

e ver y simila r betwee n period s (i.e. , 0.02 1 fo

r 1998-199 9 an

d 0.02 3 fo r 1997-1998) . The increase donshor e transpor t caused b y th e E l Nin o condition s durin g th e 1997
- 199 8 perio dreducedth e difference s ii i th e estimate s b

y compensatin g fo

r th e larg e difference s i

n alongshor e transpor t betwee n th e tw o periods . Interpretation

of Assessment

Results Snubnos e sculpin ha s neithe r commercia

l nor recreationa

l fishery valu e an

d ther e i s littl e informatio n o

n it s ecologica

l rol e i n th e community . Becaus e ofth e absenc e o f an y fishery fo

r thi s species , n o catch dataca n b e used t o compar

e harves t mortalit y rate s t o entrainmen

t mortalit y rate s ( P M ). Ther e als o ar e n o stock s o r

adult densit y estimate s tha

t coul d b e use

d to conver

t P M int o equivalent

adult losse s (assumin g n o compensator y mortality) . Annua l mea n densit y ofsnubnos e sculpi n larva e fro mIntak e Cov e surfac e plankto n tow s show s adeclinin g tren di

n abundanc e ove

r time , although th e estimate s fo r 1997 an d 199 8 appea

r to hav e levele dof

f (Figure 5.2.6-12) . Reduced larva l productio n ma

y affec t recruitmen

t an d eventuall y adult

populatio n densities . Reduction s i n adult densit y du e t o entrainmen

t ofsnubnos e sculpi n larva

e couldb e expecte dto appea r only afte r severa l generations . Ther

e wer e no estimate s i

n th e scientifi c literatur

e ofth e life-spa

n or ag e a t sexua l maturit y fo r snubnos e sculpin , though they ar

e likely t o b e simila

r to othe r small , nearshor

e cottids : 1- 3 yr

fo r sexua l maturit y an d2- 7 yr fo r longevit y (Gibso n 1969 ; Mille

r 1979 ; deVlamin g et

al . 1982 ; Grossma

n an ddeVlamin g 1984 ; Freema n et al . 1985 ; Well s 1986 ; Pierc e an d Pierson 1990) . Adult abundanc e ofsnubnos e sculpin observed i n the DCP P Receivin g Wate

r Monitorin g Progra m(RWMP) studie s o

n subtida l fishe s varie s considerably through time , bu t show s a downwar dtren dfro mth e earl y 1990 s through 199 8 (Figure 5.2.6-14) . Thes e datawer e collecte d alon g thre e 5 0 mtransect s i n a n are aapproximately 1 k

msout h o f Diabl o Cove no

t contacte d b

y th e plant' s therma

l discharge . Sinc e th e potentia l life-spa n an d ag e a t sexua l maturit y ofsnubnos e TENER A E9-055. 0 5-22 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 6 5.2. 6 Sculpin s sculpi n ar e les s tha n th e time sinc e powe

r plan t operatio n began , ther

e ha s bee n sufficien t time fo r losse s i n th e adul t populatio n to occur

a s aresult

ofadecreas e i

n larvae . Thus , i

t appear s tha

t larva l entrainment

mortalit y ofsnubnos e sculpin ma

y b e afacto

r i n th e reductio n o f

adul t abundanc e i

n th e vicinit

y o f DCPP . Snubnos e sculpi n hav e asmalle r geographica

l distributio n (Farallo n Islands , norther n Californi a t o Isl aSa n Geronimo , norther

n Baj aCalifornia) tha

n othe r centra l Californi asculpin s (Eschmeye

r et al . 1983 ; Lov e et

al . 1996) . Although th e result s ofth e ETM evaluate d usin g extrapolate dabundanc e implyin g alarg e populatio n area , th e mor e restricte d distributio n o f

thi s taxo n indicate s tha

t a n estimate o f

P M closer t o th e value s estimate d usin g alongshore transpor t alon e ma y b e mor e appropriate . Thes e estimate s rang e fro mapproximately 10 % t o ove r 20% , dependin g upon larva

l duratio n an

d samplin g perio d (Figure s 5.2.6-13) . Base d o n Moser' s (1996 ) reporte dsiz e a

t flexion o f 4.2-4. 7 mm , th e lengt

h rang e o f larva e entraine d show s tha

t post-flexio n larva

e are stil l subjec t

t o entrainment

(Figure 5.2.6-10) . Thi s als o indicate s tha t snubnos e sculpi n larvae hav e aprolonge d exposur e t o entrainment . Th e prolonge d exposure perio dan dth e level s o f

entrainment

mortalit y estimate d b

y P M ma y partiall y explai n other result s tha t sho w long-ter

mdecline s i

n larva l abundanc e i

n intak e sample s (Figur e 5.2.6-12 ) an d decline s i n loca l adul t abundanc e (Figur e 5.2.6-14) .

TENER A E9-055. 0 5-22 8 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 6 Sculpin s



### 5.2.6. 3 Cabezo n (Scorpaenichthys marmoratus)

Scorpaenichthys marmoratus (Ayre s 1854) ; cabezon ; lengt h to 9 9 cm ; Sitka , Alaskat o PuntaAbreojos , centra l Baj aCalifornia ; intertida

l t o approx . 8 5 m ; brown , reddish , or

greenis h abov e whitis h o

r greenis h below (Mille

r an d Le a 1972 ; Eschmeye

r etal . 1983) . Th e cabezo n (Scorpaenichthys marmoratus) i s th e larges t Nort h America n specie s o f

marin e cotti d andoccur s ove

r th e nearshor

e continenta

l shel f fro mdepth s o f

8 5 mup t o th e intertida

l zon e (O'Connel l 1953 ; Matares e e t al . 1989) . Cabezo n are apopula r spor t fish an d are als o landedcommercially (Fitch an dLavenber

g 1971 ; Lam

b an d Edgell 1986) . Female s ar e oviparou s an dla y demersal , adhesiv e egg s i n rock y crevice s or

o n algae ; male s guar

d th e eg g nes t

unti l th e pelagi c larva

e hatch (Burg e an

dSchult z 1973 ; Fede

r e t al . 1974 ; Matares e et

al . 1989) . Mose

r (1996 ) indicate s tha

t cabezo n larva

e hatch a t 3- 6 mm . Larva e appea r i n th e wate r colum n aroun d Novembe

r or Decembe r an d recruit to tidepool s a

t around4 0 m

mS L i n Marc h of f Mos s Beach , Californi a(RR . Harr y unpubl . datacite d i

n O'Connel l 1953) , implyin g a3- 4 m o planktoni c duration . Female s begi n to matur e i n thei r thir d yea r betwee n 25-4 8 c mS L (Fitch an

d Lavenber

g 1971) , an

d all ar e matur e b y yea r five (Star r et al . 1998) . Fecundit

y fo r thi s specie s ha s bee

n reporte d i

n severa l sources : 45,00 0 egg s fo

r a4 3 c mS L specimen an

d95,00 0 egg s fo

r a65 c mSL specime

n (Har t 1973) ; mea

n fecundit y o f 48,70 0 egg s fo

r a1. 4 k g female an

d 97,60 0 egg s fo

r a4. 6 k g female (O'Connel l 1953 ; Bane an d Bane 1971) ; an

du p t o 152,000 egg s fro

ma7 6 c mS L female (Star

r e t al . 1998) . O'Connel l (1953 ) state s tha

t female s spaw

n mor e tha n asingl e batch o f

egg s pe r year . Female s liv e t o 1 3 y r an dmale s to 9 yr

(O'Connel l 1953) .

TENER A E9-055. 0 5-22 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.4 8 5.2. 6 Sculpin s A s wit h other member s ofth e Cottidae , there ar e insufficien

t datato parameteriz e th e FH an d AEL approache s fo

r impac t assessment . N o independen t estimate s of

survivorship fo

r earl y lif e stage s prio r

t o entrainment

or late r lif e stage s ar e availabl e fro

mth e literature . Thus , th e impact o f entrainment

o n thi s species ' populatio n will b e assesse d usin g only th e ETM. Summary

of Field Collections Estimate s o f

cabezo n larva

l abundanc e showed distinc t seasona l peak s a t th e DCP P intak e structur e durin g th e year s 1996-199 9 (Appendix H ) wit h a n apparent tren d o f decreasin g abundanc e a

t th e intak e ove r th e sam e perio d (Figur e 5.2.6-15) . Ther e wer e 1,93 8 larva

l cabezo n identifiedfrom57 5 bong o ne t subsample s collecte d a

t th e DCP P intak e structur e betwee n Octobe r 199 6 an dJun e 199 9 representin g 12 % ofth e entrainment sample s collecte d an

d processe ddurin g tha

t period . Th e spawnin g perio d fo r cabezo n i n winte r 1996-199 7 wa s longe

r an dha dhigher abundance s tha

n th e winter

1997-199 8 spawnin g period . Thi s differenc e ma y hav e bee n relate dt o th e E

l Niii o even

t tha t occurre d durin g lat

e 1997 (Lyn

n et al . 1998 ; NOA

A 1999 ) a s substantia

l increase s i

n wate r temperature s an

d lowere d productivit

y negatively affected larva l productio n andsurvival . Th e limite d sample s availabl e fro mth e winter

1998-199 9 spawnin g perio dappea

r t o sho w simila

r timin g a s previou s years . The seasonalit

y o f larva l cabezo n i

n th e DCP P stud y gri d wa s simila

r to th e timin g observe d fro m th e sample s a

t th e DCP P intak e structure (Figur e 5.2.6-16) . Ther e wer e 88 7 cabezo n larvae identifiedfro

m32 6 bong o ne

t subsample s (Appendix H ) representin g 11 % o f th e stud y gri d sample s collecte dan

dprocesse dfromJul y 1997-Jun e 1999 . The spatia l distributio n o f

larva l cabezo n abundanc e i

n th e stud y gri d durin g 1997-199 8 Analysi s Perio d 3 appeare d primaril y constraine dagains t

th e shorewar

dside ofth e stud

y grid . During 1998-199 9 Analysi s Perio d 4 , cabezo n larva

e appeare dt o b e mor

e widely distribute d i

n th e stud y grid . Th e stronge r alongshore current s durin g th e secondanalysi s perio d ma y accoun t fo r thi s difference . Larva

l dispersa l ma y hav e bee n mor e limite ddurin g th e E

l Nin o condition s presen

t durin g th e 1997-199 8 analysi s perio d du e t o weake

r alongshor e an d stronger onshor e currents .

TENER A E9-055. 0 5-23 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.4 9 5.2. 6 Sculpin s Standar dlength s o f

al l cabezo n larva

e collecte d a

t th e DCP P intak e structur e betwee n Octobe r 199 6 an dJune 1999 an

dmeasure d (1,53 7 larvae ) range d fro maminimu

mof 2. 3 m mto a maximu mof 8. 4 m m(Figure 5.2.6-17) . Th

e centra l 98 % o f thi s length-frequency distributio n resulte di n minimu man dmaximu mlength s o f

3. 7 m man d 6. 1 mm , respectively , tha t wer e use d fo r calculatin g larva

l duration . Th

e mea n lengt h o f thi s distributio n wa s 4. 8 mm . Reported hatchin g siz e fo

r thi s specie s range d fro

m3- 6 m m(Mose r 1996) . Th e fac

t tha t w e observe d som

e larva e smalle r tha n th e reporte dhatchin g length s ca n b e explaine d partly b

y natura l variatio n o f hatch length s withi n th e populatio n an d partly b y th e phenomeno n o f shrinkag e following preservatio n (Theilacke

r 1980) . Th e growt h rat e applie d to thi s specie s (0. 3 mm/d) wa s derive d fro mO'Connel l (1953 ) an

dMose r (1996 ) an d wa s used t o estimate age s o f entraine d larvae . Assumin g tha

t th e shortes t

larva e (eithe r 2. 3 or 3. 7 mm ) wer e immediately post-hatch an d aged zer o days , th e estimate dage s o f larva e entraine d could rang e fromzero day s u p t o 8-2 0 d post hatchin g forth e larges t

larva e measured . The averag e estimate d age s o f cabezon larva

e entraine d a t DCP P rangedfrom4- 8 d post-hatching . Distribution s o f

cabezon larva

l length s a t th e DCP P intak e structur e an d i n th e stud y gri d wer e compare dusin g aKolmogorov-Smirno v tes t (Figure 5.2.6-18) . The tes t detecte d asignifican

t differenc e betwee

n th e tw o distribution s ( p < 0.001) . Larva e i n th e stud y gri d ha d agreate r proportio n o f

smalle r individual s relativ e t o collection s a t th e intak e structure . A /-tes t

als o detecte dasignifican

t differenc e ( p < 0.002 ) betwee n th e mea n length s fo

r the tw o locations : 4. 7 m ma t the DCP P intak e an d4. 8 m mi n th e stud y grid . While thes e difference s wer e statisticall y significant , w e believ e tha t th e biologica

l significanc e ofthes e difference s wa s low . Estimating

Total Annual Entrainment The annua l estimate dmea

n entrainmen

t o f cabezon larva

e ranged fro

m14,700,000 ( SE = 1,460,000) i

n 1997-9 8 Analysi s Period s 2 an d 3 t o 35,700,00 0 ( S

E =2,720,000 ) i

n 1996
- 9 7 Analysi s Perio d1 (Tabl e 5.2.6-8) . Value s o f 2 • SE(EJ.) ca

n b e use d to approximat

e 95 % confidenc e interval s aroundth e poin t estimates . Th

e confidenc e interval s fo

r th e 1996-9 7 an

d 1997-9 8 period s wouldnot overlap , indicatin g tha

t th e difference s betwee

n the mwer e probably
TENER A E9-055. 0 5-23 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 0 5.2. 6 Sculpin s statisticall y significant . Th e estimate s fo r Analysi s Perio d 3 ar

e th e sam e a s Analysi s Perio d 2 becaus e all ofth e cabezo n wer e collecte d durin g th e October-Jun e perio d whe n th e tw o period s overlappe d(Figure 5.2.6-15) . Annua l estimate s o f

entraine dcabezo n larvae , adjusted t o along-ter mmea n based o n annua l indice s usin g weekly Intak e Cov e surfac e plankto n tow s (Figure 5.2.6-19 ) range d fro m 36,300,00 0 (SE

=3,600,000 ) i

n Analysi s Period s 2 an

d 3 t o 51,900,00 0 (SE

=3,950,000 ) i

n Analysi s Perio d1 (Tabl e 5.2.6-9) . Th e averag e inde x fo r th e year s 1997 an

d 199 8 ar e 0.007 6 an

d 0.004 5 larvae/m^ , respectively , whil e th e long-ter maverag e index i s 0.01 1 larvae/m ^ forth e year s 1990-1998 , yieldin g th e rati o 7/1, o f 1.4 5 fo r 1997 an d 2.4 7 fo r 1998 . The adjustment s increase s th e estimate s o f

abundanc e an

d decrease s th e difference s amon g them . NOTE : Estimate s of

FH or AEL fo r cabezo n usin g annua

l entrainment

wer e not calculate d becaus e there wer

e n o demographi c dat aavailabl e fo r thi s species . Empirical Transport

Model (ETM ) Monthl y estimate s o f

proportiona

l entrainment

(PE, ) 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 0.106±0.10 3 {±\SE(PE, j ) i n Octobe r 199 7 (Tabl e 5.2.6-10) . However , thi s maximu mPE, valu e wa s no t

accompanie d b

y amaxima

l estimate ofth e annua

l proportio n o f

larva e hatche d i

n th e rt h survey perio d (J,) s o i

t wa s proportionall y les s importan t t o th e estimate o f

annua l entrainment

mortalit y tha n other value s wit h higher J's. Period s whe

n bot h PE, an d Jjwer e equa l t o zero indicate d tha

t no larva e wer e collecte da

t either th e DCP P intak e or fromth e stud

y grid . Whe

n PE, = 0 bu

t Jj>0, larva

e wer e collecte da

t th e DCP P intak e durin g th e survey perio d bu t not durin g th e entrainment

survey paire d wit h th e 72-hou

r stud y gri dsurvey . Th e larges t

value s o f J occurre d fro

mDecember
Februar y i n bot h analysi s period s indicatin g tha t thes e wer e time s o f high larva

l abundanc e a

t th e intak e structure . Estimate s o f

P M fo r either alongshor e curren t transpor t or offshor e abundanc e extrapolatio n durin g bot h analysi s period s wer

e relativel y simila

r an d range d fro

m0.00 6 t o 0.0 3 (Figure s
TENERA E9-055. 0 - 5-23 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 1 rr" 1 " 5 f 5.2. 6 Sculpin s



# i i 5.2.6-20) . Cabezon adult s have bee n foun d to depth s o f

7 5 m(Mille

r an d Lea1972) an

d their larva e wer e distribute dthroughout

th e stud y gri d (Figure 5.2.6-16) . Therefore , P s wa s calculate d usin g bot h alongshor

e current movemen t an d extrapolatin g stud

y gri d abundanc e offshor

e usin g onshor e current movemen t befor e extendin g i

t alongshore . Larva

l duration s calculate d usin g th e mea n an dmaximu mlarva l length s (centra

l 98 % o f lengt h distribution ) only differed b y 4 d( 4 vs . 8 d) . Thi s similarit

y i n duratio n resulte d i

n relativel y smal

l value s o f P M an d rapi d declin e i

n thei r valu e wit h increasin g P s . Thus , i

t appear s tha

t cabezon larva

e wer e entrainabl e ove

r a relativel y shor

t perio do f thei r development . Interpretation

of Assessment

Results Cabezo n ha s bot

h commercia

l an drecreationa

l fishery value . Combined reporte d landing s a t th e port s o f Sa n Lui s an dMorr o Ba y hav e varie d durin g 1975-199 8 fro mzero i n 197 5 t o ahig

h o f 7 8 M T i n 1997 wit h a n averag e o f

9. 7 M T (Figure 5.2.6-21) . Fro

m1995-1998 , th e combined averag e catch increase ddramatically t o ove r 6 0 MT/y r a s aresult o f increase d fishin g effor

t stimulate db

y ahig h demandfo

r cabezo n i n th e 'live-fish ' fishery . Juvenil e an d adult cabezon abundanc e examine dusin g dat afromth e DCP P Receivin g Wate

r Monitorin g Progra

m(RWMP) studie s o n subtida l fishe s appear s to b e adeclinin g sinc e 199 3 (Figure 5.2.6-21) . Mea n abundanc e ofjuvenil e an

dadult cabezo n wa s estimate d fro mthre e 5 0 mtransect s i

n a n are a approximatel y 1 k

msout h o f Diabl o Cov e an

d not contacte d b

y th e plant' s therma

l discharge . Thi s declin e likely reflect s th e increase d 'live-fish ' fisher y activit y targetin g young , nearshor e species . Increase s i

n th e activit

y o f fisherma n i n th e 'live-fish ' fisher

y nea r DCP P ha s bee n noted sinc e approximately 1995 . Ther e doe s not appea r to b e asimila

r long-ter mabundanc e decline fo

r cabezo n larva

e fro mth e Intak

e Cove surfac e plankton tows ; mainl y due t o hig

h abundanc e i

n 199 5 (Figure 5.2.6-19) . I

n addition , th e narro w siz e rang e o f larva e entraine d b

y th e powe

r plan t (centra l 98 % o f length-frequenc y distributio n ranged fro m3.7-6. 1 mm

) indicate s tha

t cabezon larva e ar e expose dto entrainmen

t fo r arelativel y shor

t perio d oftim e (Figure 5.2.6-17) . Additionally , mos t

larva e entraine d wer

e shorte r tha n the reporte d lengt

h a t flexion o f 7. 0 m m (Mose r 1996) . While i

t remain s unclea

r whethe r loca l cabezon population s ar

e i n declin e afte

r

TENER A E9-055. 0 5-23 3 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 6 Sculpin s

examinin g thes e data , th e siz e rang e o f entraine d larvae an

d relativel y low estimate s o f P M ca n lea dt o th e conclusio n tha

t larva l entrainment

mortalit y i s no t affecting loca

l adul t populations . Empirica l transpor t modelin g result s indicat

e tha t th e powe r plan t ma y annually entrai n approximatel y 1.5-3.5 % ofth e cabezo n larva e i n a n are a2- 3 time s th e siz e ofth e stud y gri d (assumin g alongshor

e transpor t only ) bu t les s tha n 1 % o f larva e i n a n are afro m4-2 2 time s th e siz e ofth e stud

y gri d(assumin g bot

h alongshor

e an d offshor e transport) . Using thi s rang e o f values , a n estimate o f

P M = 0.01 5 o r

1.5 % wa s used t o estimate entrainment effect s o n cabezo n landing s assumin g n o compensator y mortality . Based o

n landing s an

d revenue s o f

cabezo n i n th e Morr o Ba y are afro m199 8 (75. 2 MT an

d $592,300 ; PSMF

C PacFI N database) , th e averag e dolla r los s t o th e cabezo n fisher

y (assumin g a'1.5 % proportiona l loss ) du e t o larva

l entrainment

a t DCP P woul db e approximatel y $9,000/yr .

TENERA E9-055. 0 5-23 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0 

# i IP.5 3 rr"' " 5.2. 6 Sculpin s

Tabl e 5.2.6-1 . Summar

y o f know n demograph

y fo r fou r closely relate d cotti d species ; x indicate s dat aavailabl e fro mpublishe d sources ; *indicate s length-frequency datato estimat e tota l adult mortalit y i s availabl e fro

mthi s study ; —indicate s no dataavailable . S S S ^ e @ ^ e * ^ ta ^e Specie s '* * b "va " 0duU Fecundit

y maturit

y Spawnin

g Longevit

y Growt

h Duratio

n A. lateralis — O. maeulosus — O. snyderi — C. analis — X X X

X X

X X

X 1 Eg g stag e duratio n 2 Planktoni c larva l duratio n
Tabl e 5.2.6-2 . Estimate dtota l annua l entrainment

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

d sculpin (Artedius lateralis) larva e fro mth e thre e analysi s periods . Analysi s Perio d E T 1 ) Oc t 23 , 1996-Sep 30 , 199

7 88,900,00 0 2 ) Oct 1 , 1997-Se

p 30 , 199 8 96,100,00 0 3 ) Ju l 1 , 1997-Jun 30 , 199 8 107,000,000 SE(E T ) 3,660,00 0 9,410,00 0 9,490,00 0 X i

XL 2

TENER A E9-055. 0 5-23 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 4 5.2. 6 Sculpin s Tabl e 5.2.6-3 . Estimate dtota l annua l adjuste d entrainment

(E Ad/

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

_T ) ) fo r smoothhea

d sculpi n (Artedius lateralis) larva e fro mth e thre e analysi s periods . Analysi s Perio dE Adj

_ T SE(E Adj

_ T ) 1 ) Oc t 23 , 1996-Sep 30 , 199 7 57,700,00 0 2,370,00 0 2 ) Oct 1 , 1997-Sep 30 , 199 8 115,000,00 0 11,300,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 129,000,00 0 11,400,00 0

TENERA E9-055. 0 5-23 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 5 5.2. 6 Sculpin s Tabl e 5.2.6-4 . Smoothhea d sculpi n (Artedius lateralis): Monthl y estimate s o f

proportiona

l entrainmen

t ( PE, ) an

d annua l proportio n o f

larva e hatched i

n th e rth surve

y perio d (Jj) 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 : Jul y 1 , 1997-Jun e 30 , 199 8 Surve y Start

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 PE,

0.0060 0 0.023 6 0 0 0 0 0 0 0.016 6 0.043 1 0.035 4 0.038 0 SE(PE,)

0.0024 8 0.0079 7 0 0 0
' 0 0 0 0.0045 3 0.011 5 0.0075 0 0.0068 5 

## f

0.11 2 0.017 5 0.0023 5 0.0001 6 0.0002 2 0 0.0025 1 0.0017 3 0.031 7 0.45 3 0.16 1 0.21 9 SE(j)

0.0053 4 0.0011 1 0.000440 0.000090 0 0.000110 0 0.00044 0 0.000240 0.0016 5 0.016 3 0.0064 6 0.0086 1
b ) Analysi s Perio d 4 : July 1 , 1998-Jun e 30 , 1999 Surve y Start

Dat e 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 PE,

0.0046 6 0.0058 3 0 0 0 0 0.019 4 0.028 4 0.016 5 0.071 6 0.044 0 0.072 9 SE(PE,}

0.0022 9 0.0061 9 0 0 0 0 0.010 4 0.01 0 0.0048 3 0.022 2 0.0097 3 0.018 1 

## f

0.030 1 0.0019 8 0 0 0 0 0.015 7 0.051 1 0.091 5 0.30 0 0.32 9 0.18 0 SE(f,)

0.0015 5 0.00036 0 0 0 0 0 0.0013 3 0.0021 4 0.0035 1 0.0075 9 0.0078 8 0.0047 1

TENER A E9-055. 0 5-23 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 6 5.2. 6 Sculpin s Tabl e 5.2.6-5 . Estimate d tota l annua l entrainmen t (E T ) an d standar d erro r ( SE(E T ) ) fo r

snubnos e sculpi n (Orthonopias triads) larva e fro mth e thre e analysi s periods .

Analysi s Perio d E^. SE(E^.) 1 ) Oc t 23 , 1996-Se p 30 , 199 7 85,600,00 0 3,490,00 0 2 ) Oc t 1 , 1997-Se p 30 , 199 8 59,800,00 0 4,120,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 75,500,00 0 4,094,00 0

Tabl e 5.2.6-6 . Estimate d tota l annua l adjuste d entrainmen t (E Adj

_ T ) an d standar derro r

( SE(E

MJ

_ T ) ) fo r snubnos e sculpi n (Orthonopias triads) larva e fro mth e thre e analysi s periods .

Analysi s Perio d E Adj

_ T SE(E MJ . T ) 1 ) Oc t 23 , 1996-Se p 30 , 199 7 110,000,00 0 4,480,00 0 2 ) Octl , 1997-Sep30 , 199 8 83,500,00 0 5,750,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 105,000,00 0 5,720,00 0

TENERA E9-055. 0 5-23 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.5 7 5.2. 6 Sculpin s Tabl e 5.2.6-7 . Snubnos e sculpin (Orthonopias triads): Monthl y estimate s o f

proportiona

l entrainment

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

larva e hatched i

n the rth surve

y 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 yStar t Dat e Ju l 2-1 , 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 

### PE,

0.013 9 0.018 2 0.85 9 0.85 9 0.0047 4 0.85 9 0.014 3 0 0 0.055 6 0.032 3 0.046 7 SE^PE,}

0.0048 2 0.0067 1 0.28 8 0.52 7 0.0062 5 0.91 1 0.0076 0 0 0 0.020 1 0.0089 4 0.013 2 /

0.24 6 0.058 9 0.032 2 0.0058 8 0.0034 3 0.0030 3 0.013 3 0.0047 2 0.0064 8 0.21 6 0.11 7 0.29 3 

### SE(J)

0.0083 7 0.0029 6 0.0017 3 0.00070 0 0.00051 0 0.00051 0 0.0010 8 0.00050 0 0.00081 0 0.010 6 0.0048 0 0.0087 7
b ) Analysi s Perio d 4 : July 1 , 1998-Jun e 30 , 199 9 Surve yStar t Dat e 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 y24 , 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 

### PE,

0.012 9 0.0088 5 0.0044 5 0.019 9 0.029 2 0.0047 0 0.072 6 0.053 2 0.12 3 0.10 4 0.035 7 0.15 0 SE(PE,)

0.0058 2 0.0078 3 0.0029 3 0.010 3 0.027 0 0.0050 9 0.040 7 0.025 5 0.041 4 0.042 0 0.0089 6 0.052 7 

### f

0.14 8 0.0090 8 0.0042 0 .0.014 8 0.016 0 0.0037 5 0.025 7 0.043 9 0.16 8 0.25 1 0.14 3 0.17 3 

### SE(J)

0.011 2 0.0010 9 0.00060 0 0.0012 1 0.0017 5 0.00068 0 0.0021 8 0.0029 7 0.0057 0 0.0073 6 0.0044 8 0.0074 5
TENER A E9-055. 0 5-23 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.5 8 5.2. 6 Sculpin s Tabl e 5.2.6-8 . Estimate dtota l annua l entrainment

(E T ) an d standar d erro r ( SE(E T ) ) fo r cabezo n (Scorpaenichthys marmoratus) larva e fro mth e thre e analysi s periods . Analysi s Perio dE T SE(E T

) 1 ) Oc t 23 , 1996-Sep 30 , 1997 35,700,00 0 2,720,00 0 2 ) Octl , 1997-Sep 30 , 199 8 14,700,00 0 1,460,00 0 3 ) Ju l 1 , 1997-Ju n 30 , 199 8 14,700,00 0 1,460,00 0

Tabl e 5.2.6-9 . Estimate dtota l annua l adjuste d entrainment

(E Adj

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

_ T ) ) fo r cabezo n (Scorpaenichthys marmoratus) larva e fromth e thre e analysi s periods . Analysi s Perio dE AdJ . T SE(E AdJ

_ T ) 1 ) Oc t 23 , 1996-Sep30 , 1997 51,900,00 0 3,950,00 0 2 ) Oc t 1 , 1997-Sep 30 , 199 8 36,300,00 0 3,600,00 0 3 ) Jul 1 , 1997-Ju n 30 , 199 8 36,300,00 0 3,600,00 0

TENER A E9-055. 0 5-24 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0T- J _Pj5 ^ 5.2. 6 Sculpin s Tabl e 5.2.6-9 . Cabezo n (Scorpaenichthys marmoratus): Monthl y estimate s o f proportiona l entrainmen t

( PE, ) an d annua l proportio n o f larva e hatche d in th e rth surve y perio d (Jj) an d associate d standar d error s (SE) use d in estimatin g entrainmen t 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 Start

Dat e PE, SE 

# (m 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

0 0 0.10 6 0.0060 8 0.014 0 0.0031 7 0 0 0 0 0 0

0 0 0.10 3 0.0034 0 0.0039 5 0.0024 4 0 0 0 0 0 0

0 0 0.093 5 0.059 6 0.28 9 0.42 8 0.10 8 0.0092 4 0.010 7 0.0028 0 0 b ) Analysi s Perio d 4 : Jul y 1 , 1998-Jun e 30 , 199 9 Surve y Start

Dat e PE, SE(PE,) fi 5E(f.) 0 0 0 0.0083 0 0.0060 5 0.013 9 0.018 5 0.0085 4 0.0019 7 0.0021 9 0.0011 5 0
SE(J,) 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 y24 , 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

0 0 0 0 0.0014 0 0.0063 0 0.0035 9 0.0038 0 0.0067 9 0 0 0

0 0 0 0 0.0007 2 0.0020 9 0.0012 7 0.0018 1 0.0077 4 0 0 0

0 0 0 0 0.10 4 0.58 7 0.17 7 0.10 3 0.02 8 0 0 0

0 0 0 0 0.0089 5 0.017 5 0.011 2 0.0076 8 0.0048 6 0 0

TENER A E9-055. 0 5-24 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 0 5.2. 6 Sculpin s

U J c o 0.4 - E 2* . 0.3 " W c C O 0.2 " Q c C O C O o.o Smoothhea d sculpi n

(Artedius lateralis)

,.1.1 1 

## llLL.-.. rinlniini 

## .. r 

## , A 

## iL i

nmiffw i f i r 

# b l

" " m i i i 

### . i ! lllll l II I II I I Mil l II I Mi l I I II I I IIII I I II I I II I II I II I II I Mil 1 1IIIIIII1 1 Mi l III I M l lllll l 1 1 II1 1 1I I Mil l 11II I Mi l Mil l II I III I II I III111II1 1 I M I II I 1111111II1 1 II I |o|N|D| j |F|M|A|M|j|J|A|S|O(N|D|J|F| M A [ M J| J A|S|O|N|D J |FM|A|MJ | Surve y Dat e

• designatessurveywitridensitys O
Figure 5.2.6-1 . Weekly mea n larva l densit y (#/m3 + 1 S.E. ) a

t th e DCP P intake .

TENERA E9-055. 0 5-24 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0m

z m m ( O i o O l O l

S " N J C O

3 1 3 '

u
t o § 

## § 1 r o 5 o ST. o o o 3 Smoothhea d sculpi n (Artedius lateralis)

C O

# E 0.2 7 0.24 0.2 1 0.1 8 0.1 5 0.1 2 0.0 9 0.0 6 0.03 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

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 5.2.6-2a . Mean larva l densit y (#/m 3 ) collecte d in th e DCP P study gri d cell s an d a t th e entrainmen t

samplin g location . U l k > i » 0 » O c 5 " C O

b

>P.6 2 5.2. 6 Sculpin s

c o o 3 ©

*Int Q . a . o m Q 3

_ J c B C O ^ * £

£2 

# 1

• 2 C O 

### " 6 C D t 

## 3 , c 3 u ( A T 3 C O C U J Z J = o o E C O o o o > C D C O

e o c n c n c x <
0 0 0 0 C O 5
0 0 O ) C O C M C O

O O cr > C N C N C O

\ \ \ \ \ \ \ \ \ \ r —Trr;ooiocMe»CDco Q w w " r r ^ooo o 

## ,W/ # cCont J = a 

### s i n a > fc 8 1 

# 1 ii i a > E 5 1 

# 1 ft a > E s 1 

# 1 c

c a o

_ o bt> c

c

C u ra § c/ i "< 5 u T 3 •c 0 0 > » • a 3 C/ l C U C u U Q < u

" O * — » O
" o o J 5 w > > 'tj. C < U T 3 "cS J S c c o u
a * 

### e o o C N i S O C N «r i 

## e s D U TENER A E9-055. 0 5-24 4 Fina l 316(b ) Demonstratio n Marc h 1,200 0B B B B

m z r n m C O i o 0 1 O l

r o

3 Q L c o

- 2 

## § 1

- » •C O t o C O O s? . o o O 3 Smoothhea d sculpi n

(Artedius lateralis)

C O 

# E 0.2

7 0.24 0.2 1 0.1 8 0.1 5 0.1 2 0.0 9 0.0 6 0.03 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

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 5.2.6-2 c (continued) . Mea n larva l densit y (fl/m 1 ) collecte d i n th e DCP P stud y gri d cell s an d a t th e entrainmen t

samplin g location . U l t o b > c o o c 3 Cfl 'P.6 4 5.2. 6 Sculpin s

.C O 

# 1 -S i 3 5 CO = 5 " 5 C D 

## 3 , c 'a. o CO 7 3 CO C U X T £ o E C O c n C O CM C N c 3 —i o > p >23 > « C O 2 o > o > c o Q . < o > O ) C O T —Mar

o > o > C M X I C O l i -
e n c n

- ^ c C O
- ^ c

0 ( 3 0 0 0 0 c a c ra C O «- » c a > 5raient V -B ra • 0 

### S C O u 0rid 0 0 > . • 0 3 C O Ou a . 

### u Qthe c

- 0 3 C J u 0 0 £ % > » c o C C D T 3rva ra

\ \ \ \ \ \ \ \ \ \ NvroiBWOion o CMCMCM^^T-ppO p OOOOOOOC30 0 

### ,UJ/ #ours •£ 8 £Depeter b 8 | 

# 1eter fc S • 

# 1 C Oeter fc 8 • 

# 1 •9

c w S s e u • o CN I 1 M P v 5 

### S , TENER A E9-055. 0 5-24 6 Fina l 316(b ) Demonstratio n Marc h 1,200 0r , , - , -. , ,. . 5.2. 6 Sculpin s

0 ) 

### u c •Q ) ^ . i
_ 3 O ,o - O
_ > > o c C D C 7 C D L _ U . C 5 - c u o C O 

### a . Smoothhea d sculpi n (Artedius lateralis) N = 4,92 9


# J llllhii-i M 

# |

1. 5 2. 0 2. S 3. 0 3. S A.O 4. 5 ******* Lengt h Categor

y (mm )
i • • i • • i • • i • • i • • i • i • i • • i • • i i i i O 3 6 S 1 2 1 5 I S 2 1 2 4 2 7 •*•-*••* • Estimate d age (days

) Figure 5.2.6-3 . Lengt

h frequency of

all measured larva

l fis h collecte d i

n the 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 5-24 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 6 5.2. 6 Sculpin s

15— I

10 "

o 0 ) 3 O o O Mi n 1 %

« 15 " 

### c C O cr C O —Mi r

1 0 — c C O o CD Smoothhea d sculpi n (Artedius lateralis)
Entrainment : N=65 5 Median ! Mea n 99 %

1 % Media n Grid : N=28 0 Mea n

Lengt h Categor

y (mm ) Ma x

4. 7 +

*

99 % Ma x

4. 7 * •

?

Figur e 5.2.6-4 . Lengt

h frequency o f

measure d fis

h fro mentrainment

survey s tha

t paire d wit

h gri d survey s (bot

h year s combined) . Minimum , median , mean , maximum , an d centra l 98 % ofth e larva l length s are noted . X-axi s scal e i s not continuou s a

t large r lengths . TENERA E9-055. 0 5-24 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 7
5.2. 6 .Sculpin s

U J C OMeanDensity(#/m3+/- 0.1 2 — O.l l ~Z 0.1 0 — 0.0 9 .- E 0.0 8 — 0.07" : o.oe- E 0.05 — o.04- r 0.03" ^ 0.0 2 ~ 0.0 1 - i o.oo—

1 Smoothhea d sculpi n (Artedius lateralis)

j

. 5 • 

# | i ' '

IIIII I 199 0 199 1 199 2 199 3 1994 199 5 Yea r 

# I

i 199 6 T

i 199 7 

# I

i 199 8

Figure 5.2.6-5 . Annua

l mea n densit y +/
- 2 standar d error s (vertica

l lines ) an d gran d mea n densit y fo r all year s combined(horizonta l line ) fo r the Intak e Cov e surfac e plankton tows . The annua l mea n densitie s ar

e basedo n seve n consecutiv e month s ofdat a(Decembe r throug h June ) excep t fo r 1990 , whic

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

TENER A E9-055. 0 5-24 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.6 8 5.2. 6 Sculpin s

1. 0 — o. s — o. o — o.r- i o.e - £ 0.8 - o.* - 0.3 - 0.2 - 0 . 1 - o.o - Smoothhea d sculpi n (Artedius lateralis)

- mea n duratio n Analysi s Perio

d 3 : Ju l 1997-Ju n 199 8 R s alonosrior a

\ \

i i cttumau ? 90 % Cl . j ^Pu-

0.10 5
v * ^s^ ^ 1 ^^

1 1 ! | O x O K m B x

6 7 k m lO x

i r * k m 1B x

2 6 1 k m 2 O x

3 * 7 k m 2 S x

4 3 4 k m SO x

B2 1 k m 3S x

S0 8 k m 40 x

SO S k m Six * o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongahor a

i . o — o.» - o.e - O.T - o.e - f O.B o. * — 0 . 3 — 0 . 2 - o . i — o.o - Smoothhea d sculpi n (Artedius

lateralis)

- mea n duratio n Analysi s Perio

d 4 : Ju l 1998-Ju n 199 9 P a alongshor e

! \ i \ 1 \ • \ \ \ 

# j V

1—1—1— 1 Estimat e 90 % Cl . ! ^Pu-

0.14 6 \ | ^ ^

i 1 1— I 1 1—i—|—i—i—i—i—|—i—i—l—i—|—I— i 1—i—(— ' —i—i—i—|—!—i—i—i—|— r O x O k m S x

8 7 k m -

I O x I T * k m 18 x

28 1 k m 2 0 x

3 4 7 k m 2 8 x

4 3 * k m SO x

S2 1 k m SB x 40 x

BO B k m 88 B k m Slz a o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Figur e 5.2.6-6a . Tota

l annua l entrainment

mortalit y (P^) and 90 % confidenc e interva l (CI. ) a s afunctio n ofth e reciproca

l ofth e fraction ofth e populatio n a t ris k and containe d in th e stud

y gri d (/£ ) use dt o approximat

e th e alongshor

e extent ofth e stud

y gri d populatio n expande d on th e basi s o f alongshor e current movement s wit

h th e 90 % C.I . indicated .

TENER A E9-055. 0 5-25 0 Fina l 316(b) Demonstratio n Marc h 1.200 0P.6 9 5.2. 6 Sculpin s Smoothhea d sculpi n (Artedius lateralis)

- maximu m duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

Estimat e 90 % Cl
.

O x B x lO x 1S x 20 x 2S x SO x 38 x 4Q x O k m 8 7 k m 17 4 k m 28 1 k m 34 7 k m 43 4 k m B2 1 k m 60 8 k m BS S k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Smoothhea d sculpi n (Artedius lateralis) - maximu m duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % Cl
.

O x O k m B x

8 7 k m 10 x1 S x20 x

17 4 k m 28 1 k m

34 7 k m 2 S x

4 3 4 k m SO X 3S x 40 x

8 2 1 k m 80 8 k m 89 5 k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Figure 5.2.6-6b . Tota

l annua l entrainmen

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

l (C.I. ) a s afunction ofth e reciproca

l ofth e fraction ofth e populatio n a t risk and containe d in th e stud

y gri d (p.) use dt o approximat

e th e alongshor

e exten t ofth e stud

y gri d populatio n expande d o n th e basi s o f alongshor e current movement s wit

h th e 90 % C.I . indicated .

TENERA E9-055. 0 5-25 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.7 0 

### 5.2.6 Sculpin

s

Figur e 5.2.6-7 . Mea

n numbe r of sculpin s (Cottidae ) observe dpe r 50-mete r subtida l transec t i n th e DCP P RWM P Sout h Control area . Splin

e smoothin g algorith muse dt o fit curve throug

h points .

TENERA E9-055. 0 5-25 2 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.7 1 5.2. 6 Sculpin s

^ U J C O T ~ + r>nsity(#/m

a > oean i > 0.2 2 0.2 1 0.2 0 0.1 9 0.1 8 0.1 7 0.1 6 0.1 5 0.1 4 0.1 3 0.1 2 0.1 1 0.1 0 0.0 9 0.0 8 0.0 7 0.0 6 0.0 5 0.0 4 0.0 3 0.0 2 0.0 1 0.0 0 l..a.jlh l



### Ullll l Snubnos e sculpi n (Orthonopias triads)



### IlLIlL,-. . I M 11 1 M I M I ,| l 1111IIIII I PMAMJ J • 11 1 • • • I u

A S i MIIIIMI I

I o | J -*•*,- * Mil, . .. i

IMIIIIIIIIIIIIIIIIIMI,MIIIIIIIMMIIIIII|||II|II|||| | MJJASONO|J|FM| A Surve y Dat e

• designatessurveywithaensity= 0
Figur e 5.2.6-8 . Weekl

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

t the DCP P intake .

TENER A E9-055. 0 5-25 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0H

m z m 

## £ m i o O l O l b

3 O J 2 a D ) 5 

## § 1 IS ) 3 o a : 

## s ° O 3 Snubnos e sculpi n (Orthonopias triads)5-254 C O 

## E % 0.9 0 0.7 5 0.6 0 0.4 5 0.3 0 0.1 5 0.0 0

Dept h Contour s

— —2 0 meter s
• —4 0 meters —• —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 5.2.6-9a . Mea

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

samplin g location . 5 ' wm

z m 

## 5 m t o * o O l O l

O l O l

3 t o 

## 2 ° 0 ) ( D " 3

- » . OT ro 3 o a-, o o o 3 Snubnos e sculpi n (Orthonopias triacis)

C O 0.9 0 0.7 5 0.6 0 0.4 5 0.3 0 0.1 5 0.0 0

Dept h Contour s i " 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
. 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 5.2.6-9 b (continued) . Mea n larva l densit y (tf/m 1 ) collecte d i

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

samplin g location . U l k> b > c o o T J 5 !H

m z m m 

# s CJ I O l b

S " N J O l c n

3 9 1 w 

# a I

M C O o tr . S ° o 3 Snubnos e sculpi n (Orthonopias triacis)

C O 0.9 0

0.7 5 0.6 0 0.4 5 0.3 0 0.1 5 0.0 0

Dept h Contour

s

— — • 2 0 meter

s mmmm• 4 0 meter s ^•a a 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 5.2.6-9 c (continued) . Mea n larva l densit y (#/m } 

### ) collectedi

n th e DCP P stud y grid cell s an

d a t th e entrainmen

t sampling location . U l c o 0 ) n c 3 lm

z m m c o

. o c n c n

t o U l -> l

3 9 1 c o _c r 

### 2 ° t o § 

# l l

- k w r o u o s- . o o O 3 Snubnos e sculpi n (Orthonopias triacis)

C O 

# E 0.9 0 0.7 5 0.6 0 0.4 5 0.3 0 0.1 5 0.0 0

Dept h Contour s <—— 2 0 meter

s
• —40 meter

s
• —60 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 5.2.6-9 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 . U l t o b > c o o c _ • g 5'
. i n

c

nP.7 6 5.2. 6 Sculpin s

c u o c 

## g 3 o

> » o c 0 ) 3 c r c u c 8 • • c u 0 . Snubnos e sculpi n (Orthonopias triacis) N = 3,75 0

- T — 

## •lll m 1. 6 2. 1 2. 6 3. 1 3. 6 4. 1 4. 6 S. l S. 6 *+•*<*» wW * 11 1 Lengt h Categor

y (mm )
i • • • i • ' • i ' ' ' i ' • ' i ' ' ' i • ' ' i • • • i • • ' i • • • i • n— r O 4 8 1 2 1 6 2 0 • 2 4 2 8 3 2 3 6 Estimate d ag e (days )
Figur e 5.2.6-10 . Lengt h frequenc y o f al l measure dlarva 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 5-25 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0

# r 5.2. 6 Sculpin s

U J c o E iE . $ c a > Q r z ro c u 20— I

15 "

10 " C U O c c u "» - 5 — Mi n 1 %

c r C D 20— I

1 5 —

c c u 10 - o c u 

### a . Mi n 1 % Snubnos e sculpi n (Orthonopias triacis) Entrainment : N=38 0 Median ! Mea n

Media n Grid : N=16 1

Mea n

Lengt h Categor

y (mm ) 99 % Ma x

99 % 

# il l Ma x

sit ) < ? <• *r

Figur e 5.2.6-11 . Length frequenc y o f measure d fis h fro mentrainmen t survey s tha t

paire d with gri dsurvey s (both 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 5-25 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.7 8 5.2. 6 Sculpin s

U J C O 1 + Esity(#
cMeanDe 0.1 2 — 0.1 1 — I 0.1 0 — 0.0 9 - 3 ~ 0.0 8 — 0.07- r 0.0 6 — 0.05- :

- 0.0 4 — 0.0 3 - E 0.0 2 ~ 0.0 1 ~ o.o o — Snubnos e sculpi n (Orthonopias triacis) 

# I A 

# I > I

IIIII I 199 0 199 1 199 2 199 3 199 4 199 5 Yea r 

# I

i 199 6 

# i

i 199 7 • 

# I

i 199 8

Figur e 5.2.6-12 . Annua

l mean density +/ - 2 standar d error s (vertica l lines ) an

d gran d mea n density 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 base d o n seve n consecutiv e month s ofdat a (Decembe r throug h June ) excep tfo r 1990 , whic h ha d onl y fiv e month s (Februar y throug h June) .

TENERA E9-055. 0 5-26 0 Fina l 316(b ) Demonstratio n Marc h 1,200 0. ••" ' • 1 V P.7 9 5.2. 6 Sculpin s

1.20 - 1.08 - o.se o.B 4 - 0.72 ~ Jj C o.e o - 0.4 8 ~ O.SB - 0.2.4 - 0.12 - O.O O — Snubnos e sculpi n (Orthonopias triacis] - mea n duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8 P s alongahor a

\ \ \ ! 

# -y "r*" - —i—I—I—i— i Densit y

Extrapolate d P s Estimat e 90 % Cl
.
J>* f = 0.10 2 ^^Pu- 0.036 1 ±0.11 3

r—i—i— i i i i i i r i i i i i i i i i 1 —1—1—1—|—1—1—1—1—|—r —1—1—1—r 1 O x O k m B x

a r k m 1 0 x

1 7 4 K m 1 5 x

2 8 1 k m 2 O x

3 4 7 k m 2 B x

4 3 4 k m SO x

B 2 1 k m 3 S x

BO S k m 4 0 x

BS S k m S i a » o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongahor a Snubnos e sculpi n (Orthonopias triacis) - mea n duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9

Estimat e 90 % Cl
.
Pu = 0.20 2 PA I = 0.12 1 ±0.18 2

2 0 x 3 4 7 k m 2 B x

4 3 4 k m SO x

S 2 1 k m 3B x

BO B k m 4 0 x

B 8 S k m Siz e o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Figure 5.2.6-13a . Tota

l annua l entrainmen

t mortalit y (P^) and 90 % confidenc e interva l (CI. ) a s afunction ofth e reciproca

l ofth e fraction ofth e populatio n a t risk and containe d in th e stud

y gri d (P.) use dt o approximat

e th e alongshor

e extent ofth e stud

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

stud y gri d abundanc e extende dalongshor

e usin g bod

i onshor e and alongshor

e current movement s wit

h 90 % CI.' s indicated . TENER A E9-055. 0 5-26 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 0 5.2. 6 Sculpin s Snubnos e sculpi n (Orthonopias triads) - maximu m duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8

—Estimat e

—90 % Cl
.

Densit y Extrapolate d P s Pu- 0.023 1 ±0.088 3

O x O k m S x

8 7 k m 1O x 16 x 20 x 2B x

1 7 4 k m 28 1 k m • 34 7 k m 43 4 k m 30 x S2 1 k m 38 x40 x

BO B k m BB S k m S i a • o f Populatio n Relativ e t o 8tud y Orl d Equivalen t Distanc e Alongahor a Snubnos e sculpi n (Orthonopias triacis) - maximu m duratio n Analysi s Perio d 4 : Ju l 1998-Ju n 199 9 Densit y Extrapolate d Ps

of f scal e 1/Ps = 55. 8 Pu = 0.021 0 ±0.041 3

Estimat e 90 % Cl
.

S x 8 7 k m 1 0 x

1 7 4 k m 1 S x 20 x

2 6 1 k m 34 7 k m 2 B x 4 3 4 k m SO x

S 2 1 k m SS x 40 x

BO B k m BB S k m Slar e o f Populatio n Relativ e t o Stud y Oli d Equlvelen t Olatano e Alongahor a Figure 5.2.6-13b . Tota

l annua l entrainment

mortalit y (p u ) an d 90 % confidenc e interva

l (CI. ) a s afunctio n ofth e reciproca l ofth e fraction ofth e populatio n a t risk an d containe d in th e stud

y gri d (/£ ) use dt o approximat e th e alongshor

e extent ofth e stud

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

stud y gri d abundanc e extende dalongshore usin g bot h onshore and alongshor

e current movement s wit

h 90 % C.I.' s indicated . TENERA E9-055. 0 5-26 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0r f • T 5.2. 6 Sculpin stransecti#/50-metermear 1. 2 1. 1 1. 0 0. 9 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0.1 1 0. 0 a t • s • w al^ar^B B
• aa l n • iiili i 7 8 8 0 8 2 • • • • • •

• • • 8 4 \ B • ^^^^ \ • • • • • ^s . • • > • • • • \

• • • m rn. IIIIIIIII I 8 6 8 8 9 0 9 2 9 4 Plan t Start-u p Yea r • • 9 6 •

• • • 9 8 

### Figure 5.2.6-14 . Mea

n numbe r o f snubnos e sculpin s observed pe r 5 0-mete r subtida l transec t i n th e DCP P RWM P Sout h Control area . Splin

e smoothin g algorith muse d t o fit curve throug

h points .

TENER A E9-055. 0 5-26 3 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.8 2 5.2. 6 Sculpin s

0.10 " 0.09 - U J C O * - + E * . i > C O c C O 

### n c r o a > 5 0.08 -

- 0.07 -

- 0.06 -

_ 0.05 -

_ 0.04 -

- 0.03 - 0.02 - 0.0 1 - o.oo - 

### II . Cabezo n (Scorpaenichthys marmoratus)



### U , rirmtmimiimifi

H I'rTTTITIiriTTTIIIUIIIfTHlTMIim'lITTin n 

## rU , |0|N|D| J |F|M|A|M| J | J | I 109 6 I 19S 7 nnSnmim m m i » 1111 1 M II I 1111111111 1 m 1 1 I I 111111 1 II I 11 . i n i I I 1 1 II I 111111 1 I I 1 1 I I S|OINOJFMAMJJAISON1 O 

### I . • • ••••Tiia n • a i m p I M j A I M I j Surve y Dat e T aesignatassurve y wit h densit y = 0
Figur e 5.2.6-15 . Weekly mea n larva l densit y (#/m3 + 1 S.E. ) a

t th e DCP P intake .

TENERA E9-055. 0 5-26 4 Fina l 316(b ) Demonstratio n Marc h 1.200 0H

m z m m < o 6 0 1 w o

7 " ro O ) 0 1

9 L w 

# l l

- - C O 1 0 3 O S ; O O O 3 Cabezo n (Scorpaenichthys marmoratus)

c o 

# E 0. 8

0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0. 0

Dept h Contours

— —2 0 metet s

— —4 0 meter s ^ —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 5.2.6-16a . Mea

n larva l densit y (#/m*) collectedi

n th e DCP P stud y gri d cell s an da t th e entrainmen

t sampling location . U l r o b > C O o c _ TO . 5'
. C A

0

0P.8 4 5.2. 6 Sculpin s

\ \ \ \ \ \ \ \ \ cor^tointcjeM^ o oooooooo o 

# ,w/ # • Q v O i S O c 4 

## e s
TENER A E9-055. 0 5-26 6 Fina l 316(b ) Demonstratio n Marc h 1.200 0m

z m m < o • o O l O l

V r o o > ^ i

co . C O o > 3 ^ c o 3 

## * s

- * C O * r * r o b l o sr . o o o 3 Cabezo n (Scorpaenichthys marmoratus)

C O 

# J : 0. 8

0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0. 0

Dept h Contour s »' i 2 0 meter s
• • 4 0 meter s ^ —6 0 meter s Poin t Bucho n

DCP P Intak

e

Poin t Sa n Luis

Jul . 20 , '9 8 Aug . 25 , "9 8 Sep . 15 , '9 8 Oct . 5 . '9 8 No v 10 . '9 8 Dec . 8 , "9 8 Figur e 5.2.6-16 c (continued) . Mean larval density (#/m 3 ) collecte d in th e DCP P study gri d cell s an d a t th e entrainmen t

samplin g location .P.8 6 5.2. 6 Sculp'n s

t o 

### o 

## g CO

.C O 

### 2 (1 ) C O 

## eo o 52 . c o N C D Si C O 

### o C D CM " CN c 3
p> co " C M > » C O

__ o > c n c o Q . < o > C O r o

C M c o

at

c r o

\ \ \ \ \ \ \ \ \ oNioinvnNr o oooooooo o 

## ,W/ # 

## 1 O cDepeter b 8 

# 1eter b ? 

# 1eter fc 8 

# 1 c

o

01 ) c "c
. £ c ; e v E i l l "c: 9. 1 n ? ; » •t : Ct O ; • > •t a c c 

## u

- 3 U
" 5 u J l '5 5 c O J T J £ J 2 c C O

c u S 

### c o c u T J M 9 i« < i M S r i tri c u S
TENER A E9-055. 0 5-26 8 Fina l 316(b ) Demonstratio n Marc h 1,200 0r ,.. . , 5.2. 6 Sculpin sOccurrence

oFrequencyPercent Cabezo n (Scorpaenichthys marmoratus) N = 1,53 7 1 0 —llll

s —IIIIIII M i n Media n 1«X >



# il l

<- > 1 1 1 1 1

2 . 2 2. T 3. 2 3. 7 A.Z A.' L

c Moa n 9 9 %


# ||1 |

r S. 2 5. 7 6. 2 6. 7 engt h Categor

y (mm )
•IIII I 3 2 A e O I O Estimate d ag e (days

) M a x

' VJl r

1 1 1
Figur e 5.2.6-17 . Lengt

h frequenc y o f

all measured larva

l fish 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 . 

# I TENER A E9-055. 0 5-26 9 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.8 8 5.2. 6 Sculpin s
Cabezo n (Scorpaenichthys marmoratus)

15 -

- Mi n
10 "

c o 1 % Entrainment : N=10 4 Mea n Media n



# I I 

# u 99 % Ma x

2. 8 3. 3 . 3. 8 4. 3 4. 8 

# ll I ' ' ' ' I H I 5. 3 5. 8 6. 3 6. 8 v-W Grid : N=s70

5 15— I

C D

C C O o t_. C D 1 0 — Mi n

IIIII I 1 %

+|U P Media

n Mea n 99 %



# *u l

• # i i i • * i 1^-'• I ?T T 2. 8 3. 3 3. 8 4. 3 4. 8 5. 3 5. 8 6. 3 6. 8 ""^ 

# fc LL Ma x

Lengt h Categor

y (mm )
Figur e 5.2.6-18 . Lengt

h frequency o f

measure d fis

h fro mentrainmen

t survey s tha

t paire d wit

h gri d 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 scal e i s no t continuou s a

t large r lengths . TENER A E9-055. 0 5-27 0 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.8 9 

## r 5.2. 6 Sculpin s

-•— * U J C O 1 + E 2§
. i > C O c C D OMean 0.04 8 — 0.04 4 ~E

' 0.04 0 - E 0.03 6 ~ E 0.03 2 —

z. 0.02 8 — 0.02 4 —

- 0.02 0 —

- 0.01 6 ~L , 0.01 2 — 0.00 8 - E 0.004- E p.oo o — ' 1 Cabezo n (Scorpaenichthys marmoratus)

j
: . . . - *


# , I IIIII I 99 0 199 1 199 2 199 3 199 4 199 5 Yea r 

# I

I 199 6 

# I

I 199 7 r
.



# 1

i 199 £ I

Figur e 5.2.6-19 . Annua

l mea n densit y +/
- 2 standar d error s (vertica

l lines ) an d gran d mea n densit y fo r all year s combined(horizonta l line ) fo r the Intak e Cove surfac e plankton tows . Th e annua l mea n densitie s are basedo

n seve n consecutiv e month s ofdat a(Decembe r through June ) excep t fo r 1990 , which ha

donl y fiv e month s (Februar

y through June) . 

# 1 I TENER A E9-055. 0 5-27 1 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 6 Sculpin g P.9 0

Cabezo n (Scorpaenichthys marmoratus)

- mea n duratio n Analysi s Perio

d 3 : Ju l 1997-Ju n 199 8

90 % Cl .

r—|—i—i—i—i—|—i—i—i — O x 6>

x 10 x IB x 20 x 25 x SO x 3B x 40 x O k m S T k m 17 4 k m 20 1 k m 3* 7 k m 43 4 k m S2 1 k m SO B k m 6B 6 k m Six * o f Populatio n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongahor a Cabezo n (Scorpaenichthys marmoratus)

- mea n duratio n

F» s alonoahor * Analysi s Perio d 4 : Ju l 1998-Ju n 199 9 Estimat e 90 % Cl . P/ u = 0.014 0 Pu - 0.0083 5 ±0.040 3

- I O x IB x 1 7 4 k m 2B 1 k m 2 0 x 2S x 3 4 7 k m 43 4 k m SO x S 2 1 k m 3 S x 40 x

ao a k m ae s k m Slz a o f Ropulatlo n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Figur e 5.2.6-20a . Tota

l annua l entrainment

mortalit y (P^) an d 90 % confidenc e interva l (CI. ) a s afunctio n ofth e reciprocal ofth e fraction ofth e populatio n at risk an d containe d i n th e stud

y gri d (p~ 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 alongshore current

movement s an d th e offshor e extrapolatio n o f

stud y gri d abundanc e extende dalongshor

e usin g bot

h onshor e an d alongshor

e current movement s wit

h 90 % C.I.' s indicated . TENER A E9-055. 0 W7 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0P.9 1 S.2. 6 Sculpin s Cabezo n (Scorpaenichthys marmoratus)

- maximu m duratio n Analysi s Perio d 3 : Ju l 1997-Ju n 199 8 R s alongshor e Estimat e

—90 % Cl
. Densit y Extrapolate d R s

?u = 0.0056 9 ±0.045 6

O x O k m S x

8 7 k m i i i i i i i i

lOxIBx20 x28 x30 x35 x40 x 17 4 k m 28 1 k m

34 7 k m

43 4 k m

82 1 k m

80 8 k m

88 8 k m S i a » o f Ropulatlo n Relativ e t o Stud y Gri d Equivalen t Distanc e Alongshor e Cabezo n (Scorpaenichthys marmoratus)

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

Estimat e 90 % Cl .

Siz e o f Ropulatlo n Relativ e t o Stud y Orl d Equivalen t Distanc e Alongshor e Figur e 5.2.6-20b . Tota

l annua l entrainmen

tmortalit y (p u ) an

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

tmovements an

d th 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 wit h 90 % C.I.' s indicated . 

# I TENER

A E9-055. 0 5-27 3 Fina l 316(b ) Demonstratio n Marc h 1.200 05.2. 6 Sculpin s



### a )

b ) Cabezo n (Scorpaenichthys marmoratus) Landing s fro m th e Morr o Ba y Are a

w O )

_ c T J e 8 0 7 0 6 0 5 0 4 4 0 3 0 4 2 0 - QMorr o Ba y • Por t Sa n Lui s

CO CO C O C

O

- J - J ^ J C D CJ I ^ 1 CO - » 8 ( O o o U l C O

C B •s i C O 0 » C O C O

C O C O

C O w C O

C O c n C O c o

- J Yea r

o c u C A c C O 0 ) 0 ) E I o c C O C D E 

### Figur e 5.2.6-21 . Yearly abundanc e o f cabezo n measured b

y tw o independen

t methods : a ) Commercia

l landing s o f

adult s fromMorr

o Ba y are aand , b ) Mea

n numbe r o f adult s an d juvenile s observe d pe

r 50-mete r subtida l benthi c transec t

i n th e DCP P RWMP Sout

h Contro l area . Spline smoothin

g algorith mused t o fit

curve throug

h points .

TENER A E9-055. 0 5-27 4 Fina l 316(b ) Demonstratio n Marc h 1.200 0

### r 5.2. 7 Whit e Croake r



### 5.2.7 Assessment

of White Croaker

(Genyonemu s lineatus )

Genyonemus lineatus (Ayre s 1855) ; whit e croaker ; lengt

h to 4 1 cm ; Barkley Sound , Britis h Columbi ato Bahi aMagdalena , souther n Baj aCalifornia ; inshor e to 23 6 m ; incandescen

t brownish to yellowis h o

n back , silver

below ; fins yello w to whit

e (Mille r an d Le a1972 ; Eschmeye

r et al . 1983) . Whit e croake r i s one o f eigh t specie s i n th e famil y Sciaenida

e (th e drums ) occurrin g i

n Californi a coasta l waters . Other

representative s o f

thi s famil y are whit e seabas s (Atractoscion nobilis), shortfin corvin a(Cynoscion parvipinnis), black croake r (Cheilotrema saturnum), spotfin croake r (Roncador

stearnsi), Califomi acorbin a(Menticirrhus undulatus), queenfis h (Seriphus politus), an dyellowfin croake

r (Umbrina roncador). Tw o ofthese , shortfin corvin aan d black croaker , ar

e neither commercially nor

recreationall y importan

t fishe s i n California . Whit e croake r ar e mos t abundan t i n souther n an d centra l Californi aa

t depth s fro m6 mto 7 5 m (Lov e 1996) . They tendt o for mschools , ofte

n ove r san d o r mu d bottoms . Whit

e croake r spaw n year-roun di

n centra l California . Lov e e

t al . (1984 ) stat

e tha t



# I I 1 Batc

h fecunditie s rangedfro

m800 egg s i

n a15. 5 c mlon g femal e to 37,20 0 egg s i

n a 2 6 c mlong female . Durin g th e spawnin g perio d about 19 % o f all matur e female whit

e croake r sample dcontaine dhydrate d eggs , implying tha t afemale spawned abou

t onc e ever y 5 d . Female s o f

age s 1 an

d 2 (13-1 8 cm) hav e aspawning season o f 3 m o an d spaw n about 1 8 time s pe

r season , wherea s olde

r fis h (1 9 c man d larger ) spaw n ove r a perio do f 4 mo , about

2 4 time s pe r season . Lov e et al . (1984 ) als o indicat

e tha t egg s an d larva e ar e pelagic , an

d post-flexio n larva

e settl e t o th e botto ma s they develop . Juvenile s ar e foun d nea r the botto mi n 3- 6 mo f

water , then migrat

e t o deepe r wate r a s they mature . B y one yea r afte r settlement , hal f

o f all mal e an

d femal e whit

e
TENER A E9-055. 0 5-27 5 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 4 5.2. 7 Whit e Croaker croaker ar e reproductivel y mature , wit h 100 % cohor

t maturit y attaine d b y th e third t o fourt h year . Whit e croaker s liv e 12-1 3 yr . Studie s conducte da

t th e Sa n Onofr e Nuclea r Generatin g Statio n (SONGS ) provide d estimate s o f adul t equivalent

losse s fo r white croaker

tha t wer e entraine d an

d impinge d b

y th e coolin g wate

r intak e syste m(Murdoc h e t

al . 1989) . They estimate d th e duratio n ofeac h larva l stag e (e.g. , yolk
sac , pre-flexion , flexion , post-flexion ) a t ris k b y dividin g th e rang e i

n bod y lengt h of alarv ai

n a given stag e b y th e estimate ddail y growt h rate o f 0.2 0 mm/ d (Murdoc h e t

al . 1989) . Thi s metho d assume dlinea

r growt h rate s throughou t

th e larva l stages . I n th e present

stud y w e used th e sam

e growt h rate wit h th e sam e assumption . 

### 5.2.8. 1 Summar

y of Fiel d Collection s White croaker

larva e wer e foun dseasonall y a

t th e DCP P intak e structure durin g th e year s 1996
- 1999 , wit h thei r highes t densitie s occurrin g durin g th e winter and sprin g (Appendix H) . Ther e wer e 4,30 0 larva

l white croaker

identifie d fro

m1,11 4 bong o net

subsample s collecte d a

t th e DCP P intak e structure between October 199 6 an d Jun e 199 9 representin g 24 % ofth e subsample s collecte dan

dprocesse dfro

mtha t locatio n durin g tha

t period . Th e highes t

densitie s o f

larva l croaker occurre di

n March 199 7 an d Ma

y 199 8 (Figure 5.2.7-1) . Th e densit y o f thi s specie s wa s variabl e between weeks , wit h on e o r tw o week s o f

rather high densit

y followed by severa

l consecutiv e week s o f

lowe r density . Th e highes t

entrainment

densitie s o f

white croaker

larva e i n 199 8 occurre di

n May , whil e onl y afe

w wer e see n durin g that

mont h i n 1997 . Thi s shif

t i n abundanc e peak s between year s ma y hav e bee

n affected b

y th e E l Nin o even

t tha t bega n durin g th e fall/winte

r seaso n o f 1997-9 8 (Lyn

n et al . 1998 ; NOA

A 1999) . Whit e croaker larva e generall y occurre d i

n th e DCP P stud y gri d durin g Decembe

r throug h Ma

y ofeac h yea

r (Appendix H) , wit

h thei r highes t recorde d abundanc e occurrin g durin g March 199 8 (Figur e 5.2.7-2) . Whe

n present , th e highes t

whit e croake r larva l densitie s occurre d i

n th e souther n hal f o f th e nearshor

e gri dsamplin g area . Ther

e wer e 1,71 0 larva

l whit e croake r identifie dfro

m42 2 bong o net

subsample s representin g 14 % ofth e stud y gri d subsample s collecte dan

dprocesse dfro

mJul y 1997-Jun e 1999 . TENERA E9-055. 0 5-27 6 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 7 Whit e Croaker



# L

# 1 1 I I Standar

dlength s o f

al l whit e croake r larva e collecte d a

t th e DCP P intak e structur e betwee n Octobe r 199 6 an dJune 1999 range

d fro maminimu

mo f 0.9 0 m mt o amaximu

mo f 8. 2 m m (Figure 5.2.7-3) . The centra l 98 % o f thi s length-frequenc y distributio n resulte d i n minimu man d maximu mlength s fo

r th e analyse s o f

1. 1 m man d 5. 5 mm , respectively . Th e mea n larva l lengt h i n thi s distributio n wa s 2. 4 mm . Hatching siz e fo r whit e croake r i s reporte d betwee

n 1. 5 an d 1. 8 m m(Mose r 1996) . The fac

t tha t w e observed larva

e smalle r tha n the reporte d hatchin g length s ca n b e explaine db

y natura l variatio n o f

hatch length s within th e population an d b y the phenomenon o f

shrinkag e following preservatio n (Theilacker 1980) . The growt h rate o f larva l whit e croake r (0.2 0 mm/d) reporte d b

y Murdoc h et al . (1989 ) wa s used to estimat e age s o f entraine dlarvae . Assuming tha t th e shortes t

larva e wer e immediately posthatch an dagedzero days , the

n the estimate d age s o f

larva e entraine d could have ranged fro m zero day s u

p to 22-3 7 d post-hatchin g fo r th e longes t

larva e measured . O

n average , th e estimate d age s o f whit e croake r larva e entraine d a

t DCP P range d fro

m7- 8 dpost-hatching . Difference s betwee

n th e distribution s o f

whit e croake r larva l length s a t the DCP P intak e structur e an dthe stud y gri d(Figure 5.2.7-4 ) wer e teste d usin g aKolmogorov-Smirno v test . Th e tes t detecte dasignifican

t differenc e betwee

n th e tw o distribution s ( p < 0.001) . Th e larges t differenc e betwee n th e distribution s wa s detecte d a t alengt h o f approximately 2. 7 mm , th e siz e separatin g tw o mode s ofth e distributio n fro mthe DCP

P intake . A singl e mod

e predominate d i

n th e stud y griddistribution . A t-test

als o detecte d asignifican

t differenc e (p < 0.001 ) betwee n th e mea n length s fo r th e tw o locations : 2. 7 m

ma t th e DCP P intak e an d 2. 3 m mi n th e stud y grid . Difference s i

n th e mea n ar e partly due to alarge

r difference s i

n sample siz e betwee

n th e stud y grid (n= 1,263 ) an

dth e intak e location (n=150) . A larg e sample siz e als o cause s th e /-tes t to b e highly sensitiv e to small difference s betwee n th e mean s (Za

r 1984) . Th e lengt h frequency of whit e croake r (n=3,529 ) i

n all entrainmen

t subsample s (Figure 5.2.7-3 ) yielde d adistributio n simila r t o tha t ofth e nearshor

e gri d subsamples . Whil e thes e difference s wer e statisticall y detectabl e an

dsignificant , bot

h distribution s wer

e heavily weighted wit

h recently hatched (yolk
sac ) an dpre-flexion larvae . Therefore , we believ e tha t the entrainmen

t subsample s an

d grid subsample s represent

th e sam e population of

availabl e larvae . TENER A E9-055. 0 5-27 7 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 6 5.2. 7 Whit e Croake r 

### 5.2.7. 2 Estimatin g Tota l Annua l Entrainmen t Th e annua l estimate dmea

n entrainment

whit e croake r larva e range d fro

maminimu

mo f 65,100,00 0 (SE

=3,880,000 ) i

n Analysi s Perio d 2 t o amaximu mo f 70,500,00 0 (SE

=2,620,000 ) i n Analysi s Perio d1 (Tabl e 5.2.7-1) . A 95 % confidenc e interva l around thes e estimate s approximate db

y 2 • SE(E T

) doe s no t

overla p indicatin g tha

t th e estimate s wer

e probably not statisticall y different . Annua l estimate s ofth e numbe

r o f whit e croake r larvae entrained , adjusted t o along-ter mmea n basedo n annua l indice s usin g weekly Intak e Cov e surfac e plankto n tow s (Figur e 5.2.7-5) , range dfro maminimu

mo f 305,000,00 0 (SE

=11,300,000 ) i

n Analysi s Perio d 1 t o amaximu mo f 447,000,00 0 (SE

=26,300,000 ) i

n Analysi s Perio d 3 (tabl e 5.2.7-2) . Th e averag e inde x fo r th e year s 1997 an

d199 8 ar e 0.025 1 larvae/m

^ an d 0.016 1 larvae/m^ , respectively , whil e th e long
ter maverag e inde

x i s 0.10 9 larvae/m

^ forth e year s 1990-1998 , yieldin g th e rati o III, o f 4.3 3 for 1997 an d6.7 7 fo r 1998 . Th e adjustmen

t increase s th e differenc e between th e estimates . A 95 % confidenc e interval , approximate d b y 2-SE(EMJ-T) woul d sho w astatisticall y significan t differenc e between th e 1996-199 7 estimate s an d th e tw o 1997-199 8 estimates . 

### 5.2.7. 3 Fecundit

y Hindcastin g (FH) Fecundit y hindcastin g require s age-specifi c fecundit y an d mortalit y t o asses s entrainment

effects . Whit e croaker spawn multipl e time s withi n ayear . Female s o f 1- 2 y r (i.e. , 13-1 8 cm ) underg o a 3 m o spawnin g seaso n an

dspawn ca . 1 8 time s pe

r season . Older

fish (i.e. , 1 9 c

man d larger) spawn ove r aperio do f

4 mo , ca . 24 time s pe

r seaso n (Lov e et

al . 1984) . I

n ou r calculation s w e wil l assume a

n averag e o f

2 1 eg g batche s per

yr . Th e averag e numbe

r o f egg s pe r batch wil l b e basedo n Love e t al . (1984 ) who showed amoda l ag e o f 3 yr fo r fish length s o f

18-18. 9 cm . Thi s permit s extrapolatio n t o abatch fecundit y o f approximately 5,000 egg s fo r ag e 3 yr . Lov e et al . (1984 ) foun

dtha t adult whit e croake r hav e amaximu

mlongevit

y o f 1 2 yr , an d Lov e (1996 ) state dtha

t th e specie s mature s betwee n 1 an d 4 yr , wit h hal f spawnin g afte

r 1 yr . The expecte daverag e ag e o f

maturatio n fo

r th e purpos e of

calculation s wa s estimate d a s 2 yr . TENERA E9-055. 0 5-27 8 Fina l 316(b ) Demonstratio n Marc h 1,200 05.2. 7 White Croake r



# I I Lov e (1996 ) reporte dtha t whit e croake r egg s hatc h i n 2 d , whil e Murdoc

h e t al . (1989 ) suggested a n instantaneou s eg g mortalit y rat e o f Z = 0.25 (surviva

l «78%/day) . Eg g surviva

l ca n therefor e b e estimate da s S Egg =e2l0

- 2S) =0.6065 . A n estimat e o f surviva l fo r larva e fro mth e time o f

eg g hatchin g t o entrainment wa s based o

n information o

n larva l length s collecte d fro

mDCP P entrainmen

t subsamples . The centra

l 98 % length s ofth e larva

e range dfro

m1.1-5. 5 m

mwit h amea n o f 2.44 mm . Murdoch et

al . (1989 ) state s tha t whit e croake r larva e gro w a t arat e of approximately 0. 2 m

mpe r day . The averag e time to entrainmen

t fro mhatchin g (hatch lengt

h i s assumed to b e th e shortes t lengt h recorded i

n DCP P subsamples ) i s the

n estimate d a s 6. 7 d . Assuming tha t th e instantaneou s larva

l surviva l rate i s th e sam

e a s fo r eggs , larva

l surviva l i s estimate d a s S La n m =e^ i ° 2i) =0.1873 . I t i s likely tha

t th e larva l surviva l rate i s equa

l t o or greate r tha n th e surviva

l rate o f eggs . Thus , th e surviva

l rat e fo r larva e i s probably underestimated , resultin g i n a n overestimat

e b f FH. A s a n exampl e ofth e /"//calculation , whe n thes e parameter s ar

e modeled fo

r th e perio d Octobe

r 1 , 1997 through Septembe

r 30 , 1998 , th e resultin g numbe r o f adult female s tha

t would have produce dthe numbe

r o f entraine dlarva

e i s give n a s 440,198,00 0 12- 2 FH = : - /t „ . = 7,38 0 adult female s pe

r yr . (0.6065)(0.1873)(5,000-21 ) Estimate s of

FH were differen

t betwee n th e tw o year s of

samplin g (Tabl e 5.2.7-3) . Number s of hindcas t adult female s fro

mth e thre e analysi s period s ranged fro m5,000-7,500 . Th

e leas t numbe r of hindcas t individual s wer

e estimate d fro

mAnalysi s Perio d 1 (Octobe r 1996-Septembe

r 1997 ) whil e th e greates t

wer e estimate d fro

mAnalysi s Perio d 3 (July 1997-Jun e 1998) . Sensitivity Analysi s
TENER A E9-055. 0 - 5-27 9 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.9 8 5.2. 7 Whit e Croake r Longevit y ha dth e greates t

leverag e o

n recalculate d value s o f

FH (Tabl e 5.2.7-4) . Varyin g thi s parameter i n th e mode

l resulte di

n a n FH rang e o f 2,320-237,00 0 adul t

female s fo

r th e thre e periods , compare dt o th e origina l estimate o f

5,110-7,50 0 adult

females . Survivorship ha

d th e next greates t amoun t o f leverag e o

n recalculate d FH. 

### 5.2.7. 4 Adul t Equivalen t Los s (AEL) For whit e croaker , n o independen

t estimate o f

surviva l fro mentrainment

to ag e o f adul t recruitment

wa s foun di n th e literature . T o calculate AEL a s 2 • FH, w e mus t

first alig n th e age s a t maturit y (~ 5 yr ) an

drecruitment

int o th e fisher

y (3- 4 yr ) s o tha

t th e FH female s ar

e ofth e same ag e a s the AEL

recruits . A s such , AEL

range d fro

m14,700 to 21,60 0 adult

whit e croaker pe r yea r acros s th e thre e analysi s periods . 

### 5.2.7. 5 Empirica l Transport Mode l (ETM) Monthl y estimate s o f

proportiona

l entrainment

(PE,) i n eac h rt h survey fro

mth e tw o year s sample drange dfro

maminimu

mo f zero t o amaximu

mo f 0.0340±0.00 8 (±\SE(PE, 1 ) i n Januar y 199 8 (Tabl e 5.2.7-5) . N o larva e wer e collecte d a

t either th e DCP P intak e o r fro mth e stud y gri dwhe

n bot h PE, an dth e proportio n o f

larva e presen t i n th e rth survey perio d (Jj) wer e equa l t o zero (e.g. , August-November 199 8 an d April-Jun e 1999) . Whe

n PE, = 0 an

d J>0, larvae wer e collecte da

t th e DCP P intak e durin g th e survey perio d but no t durin g th e entrainment survey paire dwit

h th e 72-hou

r stud y gri d survey . Sinc e PE, wa s weighte d b y Jj, som e ofth e large r PE, value s wer

e les s importan

t t o th e annua

l estimat e o f entrainment

mortality . Th e length s o f

entraine dwhit

e croake r larvae , excludin g th e larges t 1 % an d smalles t 1 % o f all measurements , range dfro

m1. 1 t o 5. 5 mm . Assumin g agrowt h rat e o f 0. 2 mm/da

y (Murdoch et al . 1989) , larva

e ma y b e susceptibl e t o entrainment by th e plan

t fo r approximatel y 2 2 days . The frequent , repeate dbreedin g o f whit e croake r suggest s tha

t the entrainment

a t Diabl o Canyon occur s ove

r multipl e larva

l batches . Literatur

e o n th e lif e histor y o f whit e croaker would suppor

t thi s contentio n (Lov e e t

al . 1984 ; Lov e 1996) .

TENER A E9-055. 0 5-28 0 Fina l 316(b ) Demonstratio n Marc h 1.200 0j^9 9 4 5.2. 7 Whit e Croake r



# I i 1 

# t i i 

# I i Estimate s o f P M differe dmarkedly whe

n calculate d usin g th e mea

n an d maximu mlarva l duration s an

dwer e generally highe

r durin g th e secon

d yea r o f samplin g (Figure s 5.2.7-6) . The larva l duration s calculate dusin g th e mea n an d maximu mlarva l length s differe

d b y 1 5 d ( 7 vs . 2 2 d) . Fo r / s calculate dusin g only alongshor e currents , difference s i

n duratio n di d not

caus e muc

h chang e i n P M betwee n mea n an dmaximu mduration ; ca . 2-3 % i

n Analysi s Perio d 3 an

d ca . 4
- 6 % i n Analysi s Perio d4 . Although whit e croake r larva e wer e mor e common i

n th e souther

n half ofth e stud y gridwhe

n they wer e abundan t (March 1998) , they generally occurre d throughout the stud y gri dan dwer e no t restricte dto th e nearshor

e grid cells . Therefore , P s wa s calculate d usin g bot h alongshor

e curren t movemen t an d extrapolatin g stud

y gri d abundanc e offshor

e base d o n onshor e current movement . Fo

r P s calculate d usin g alongshor e current s an

d offshor e abundanc e extrapolation , changin g larva l duratio n di d not

chang e P

M muc h i n Analysi s Perio d 3 (ca . 0.1
- 0.3 % fo r bot h durations) , bu

t yielde d achang e fro

m2 % (mea

n duration ) t o 1 % (maximu m duration ) i n Analysi s Perio d4 . 5.2.7. 6 Interpretatio n o f Assessmen t Result s Whit e croaker hav e bot h commercia

l an d recreationa

l fishery value . Love e

t al . (1984 ) state dtha

t fishing fo r whit e croake r i n Monterey Ba

y occur s o n adaily basi s yea

r round . The dail y catch ca

n rang e fro m400-90 0 k

g (ca . 0.4-0. 9 MT ) wit

h amaximu

mcatch o f

1,80 0 k g (ca . 1. 8 MT ) o f whit e croaker . Th e annua

l harves t o f whit e croaker i n Monterey Ba

y ca n then b e estimate d a

t approximatel y 24 8 MT . However , availabl e evidenc e suggest s tha t commercia

l catche s o f

whit e croake r hav e bee n declinin g sinc e around 198 5 i n th e Montere

y Ba y are a(Star

r et al . 1998) . Paymen t t o th e fishermen i

n 199 0 wa s ca . $0.19/k

g depending o

n catch siz e an

d fish condition (Lee t e t al . 1992) . The tota

l recreationa

l catch i n bot h norther n an d souther n Californi ai

n 199 8 wa s estimate da

t 443,00 0 fishes (PSMF

C RecFI N database) . Dat

afro mthe Californi a Departmen

t o f Fis h & Gam

e show tha t loca l commercia

l landing s o f

whit e croake r durin g th e perio d1975-199 8 average d9. 1 M T a t Por t Sa n Lui s an d 3. 8 M T a t Morr o Ba y (Figur e 5.2.7-7) . Becaus e ofth e low economi c valu e ofth e specie s i n compariso n to othe

r targete d species , som

e

TENER A E9-055. 0 5-28 1 Fina l 316(b ) Demonstratio n Marc h 1,200 0P.10 0 5.2. 7 Whit e Croake r ofth e whit

e croaker landing s probably represent incidenta l catche s a s aresult

ofthes e other fisheries. Lov e e t al . (1984 ) give s th e lengt

h mod e fo r whit e croake r caugh t i n the commercia

l gillne t fisher y (2 8 c mSL) an dfro mskif f sportfishin g (22. 5 c

mSL) . Th e weigh t ofa2 8 c mwhit e croake r i s approximatel y 200-22 5 g , dependin g o n gender , wit

h female s generally heavier . Assuming adaily natura

l mortalit y rat e o f 0.000 5 (Ricke

r 1975) , w e ca

n alig n th e approximatel y 5-y r old/"//female s t o a

n ag e o f recruitmen

t t o th e fisher

y o f 3. 5 yr (Lov e e t al . 1984) . I

n thi s manner , assumin g a50:5 0 sex rati o i n the population , 2 • FH

become s equivalent

to AEL. Thus , th e approximat

e AEL basedo n ///range d fro

m14,700 3.5-y

r old adult s i

n 1996-199 7 t o a maximu mo f 21,60 0 i n 1997-1998 . Using a

n averag e weigh

t o f 0.21 3 kg/adult

i n th e fisher

y derive dfro mLov e et al . (1984) , th e pric e pe

r kg fro mLee t et al . (1992) , an

d assumin g 100 % catchability ^ thes e equivalent adult losse s coul d equate t o 3.1-4. 6 M T annually , approximatel y $594-872/yr . Alternatively , thi s conservativ e estimate o f los s represent s 24-36 % ofth e averag e annua l catch fro mth e Morr

o Ba y are abetwee

n 1975-1998 . However , estimate s o f annua l proportiona

l larva l entrainment

mortalit y (P M ) tha t assume n o compensation , sugges t losse s o f 0.1 % to perhap s a s hig

h a s 6 % ofth e loca

l populatio n (ove

r area s 4-4 1 time s th e stud

y gri d area) , providin g alowe

r limit t o thes e proportiona

l effects . Adul t whit e croaker are widel y distribute d ove r san d an d mu d bottom s i

n shel f water s an d ar e not typicall y foun

di n associatio n wit

h roc k substratum . Combinin g thi s fac t wit h th e fact tha t white croake r adult s ar e rarel y observe di

n th e vicinit

y ofth e powe

r pian t (Tenera1997c ) lead s t o th e conclusio n tha

t thei r abundanc e i s centere d elsewher e tha n around Diabl o Canyon . Therefore , th e greater abundanc e o f

sof t bottomhabita

t relativ e to roc

k substratai

n th e Morr

o Ba y an d Avil a areas , combine dwit

h relativel y lo

w larva l mortalit y probabilitie s o f

P M (0.001-0.06) , suggest s tha t entrainment

impact s o n loca l whit e croake r population s ar

e not appreciable .

TENER A E9-055. 0 5-28 2 Fina l 316(b ) Demonstratio n Marc h 1.200 0