Tetra Tech, Inc.

10306 Eaton Place, Suite 340

Fairfax, VA 22030

phone 703-385-6000

fax 703-385-6007

TO: Record

FROM: Kelly Meadows

DATE: February 24, 20

SUBJECT: Spawning seasons

The attached documents present information on the

species.

Attachment A (Spawning Season for Selected Fishes) illustrates the spawning period for 

a number of common fish species found in each waterbody type.

graphic, spawning occurs at all times of th

to be present at any time of the year, depending on the waterbody).

Attachments B through F were developed using site

in New England and serve as illustrative example

locations, the spawning season

or all of the year; in some cases, flow reduction throughout the year (e.g., converting to 

closed-cycle cooling) may be the most 

peaks of these spawning period

organisms would be present; as a result, 

flow reductions that would achieve 

entrainment. Another factor to consider is what species are considered important; these 

graphics illustrate most of the species present

choose to focus on selected species

spawning periods, providing additional opportunities for flow reduction to be utilized.

MEMORANDUM

10306 Eaton Place, Suite 340

Kelly Meadows

, 2011

Spawning seasons

present information on the spawning seasons of various 

(Spawning Season for Selected Fishes) illustrates the spawning period for 

a number of common fish species found in each waterbody type. As shown by the 

graphic, spawning occurs at all times of the year (i.e., “entrainable” organisms are likely 

to be present at any time of the year, depending on the waterbody).

were developed using site-specific data at individual facilities 

and serve as illustrative examples. These plots show that, for some 

spawning seasons for organisms present in the source water may span most 

; in some cases, flow reduction throughout the year (e.g., converting to 

cycle cooling) may be the most appropriate technology option. However, the 

of these spawning periods would be when the highest concentration of 

; as a result, there may be opportunities for seasonal intake 

flow reductions that would achieve significant reductions in impingement and 

entrainment. Another factor to consider is what species are considered important; these 

graphics illustrate most of the species present at these sites, but resource managers may

choose to focus on selected species of concern, which may narrow the scope of peak 

spawning periods, providing additional opportunities for flow reduction to be utilized.

1

spawning seasons of various aquatic 

(Spawning Season for Selected Fishes) illustrates the spawning period for 

As shown by the 

e year (i.e., “entrainable” organisms are likely 

specific data at individual facilities 

. These plots show that, for some 

s for organisms present in the source water may span most 

; in some cases, flow reduction throughout the year (e.g., converting to 

. However, the 

would be when the highest concentration of entrainable 

there may be opportunities for seasonal intake 

significant reductions in impingement and 

entrainment. Another factor to consider is what species are considered important; these 

, but resource managers may

of concern, which may narrow the scope of peak 

spawning periods, providing additional opportunities for flow reduction to be utilized.