Swimming in Two-Vector Flows: Performance and Behavior of Juvenile Chinook Salmon near a Simulated Screened Water Diversion

2004 ◽  
Vol 133 (2) ◽  
pp. 265-278 ◽  
Author(s):  
Christina Swanson ◽  
Paciencia S. Young ◽  
Joseph J. Cech
Keyword(s):  
Chinook Salmon ◽  
Water Diversion ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
And Behavior

Can behavioral fish-guidance devices protect juvenile Chinook salmon (Oncorhynchus tshawytscha) from entrainment into unscreened water-diversion pipes?

2014 ◽  
Vol 71 (8) ◽  
pp. 1209-1219 ◽  
Author(s):  
Timothy D. Mussen ◽  
Oliver Patton ◽  
Dennis Cocherell ◽  
Ali Ercan ◽  
Hossein Bandeh ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Central Valley ◽  
Large River ◽  
Water Diversion ◽  
Small Scale ◽  
Fish School ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
And Behavior

Entrainment through water-diversion structures is a major passage challenge for fishes in watersheds worldwide. Behavioral guidance devices may be effective in passing fish by diversion inlets, thereby decreasing entrainment without reducing water-diversion rates, but data on their effectiveness is limited. In California’s central valley, out-migrating Chinook salmon (Oncorhynchus tshawytscha) are a species at risk for entrainment through unscreened, small-scale water-diversion pipes. Therefore, we tested entrainment susceptibility and behavior of juvenile Chinook salmon in a large-river-simulation flume at a “river” velocity of 0.15 m·s–1 with a 0.46 m diameter pipe diverting water at 0.57 m3·s–1, during the day and night. Compared with control conditions (no fish deterrent devices present), mean fish entrainment increased by 61% (day) and 43% (night) when underwater strobe lights were active, decreased by 30% when using a metal vibrating (12 Hz) ring during the night, and was unaffected by velocity cap attachments. Fish entrainments started at water velocities of 0.8 m·s–1 and decreased by 54% from spring to summer, possibly resulting from decreased pipe-passage frequency and smaller fish-school sizes. Our findings suggest that substantial entrainment can occur if fish repeatedly pass within 1.5 m of active unscreened diversions, with an estimated 50% of fish lost after encountering 18 pipes in spring and 50 pipes in summer.

scholarly journals Egg size and emergence timing affect morphology and behavior in juvenile Chinook Salmon, Oncorhynchus tshawytscha

2017 ◽  
Vol 8 (1) ◽  
pp. 778-789 ◽  
Author(s):  
Karen M. Cogliati ◽  
Julia R. Unrein ◽  
Heather A. Stewart ◽  
Carl B. Schreck ◽  
David L. G. Noakes
Keyword(s):  
Chinook Salmon ◽  
Egg Size ◽  
Oncorhynchus Tshawytscha ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
And Behavior

Modified Water Diversion Structures Can Behaviorally Deter Juvenile Chinook Salmon from Entrainment

2015 ◽  
Vol 144 (5) ◽  
pp. 1070-1080 ◽  
Author(s):  
Timothy D. Mussen ◽  
Dennis E. Cocherell ◽  
Oliver Patton ◽  
Denisse Jauregui ◽  
Ali Ercan ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
Water Diversion ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

Fine-scale taxonomic and temporal variability in the energy density of invertebrate prey of juvenile Chinook salmon Oncorhynchus tshawytscha

2020 ◽  
Vol 655 ◽  
pp. 185-198
Author(s):  
J Weil ◽  
WDP Duguid ◽  
F Juanes
Keyword(s):  
Energy Density ◽  
Chinook Salmon ◽  
Temporal Variability ◽  
Energy Content ◽  
Single Point ◽  
Single Species ◽  
Fine Scale ◽  
Temporal Differences ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

Variation in the energy content of prey can drive the diet choice, growth and ultimate survival of consumers. In Pacific salmon species, obtaining sufficient energy for rapid growth during early marine residence is hypothesized to reduce the risk of size-selective mortality. In order to determine the energetic benefit of feeding choices for individuals, accurate estimates of energy density (ED) across prey groups are required. Frequently, a single species is assumed to be representative of a larger taxonomic group or related species. Further, single-point estimates are often assumed to be representative of a group across seasons, despite temporal variability. To test the validity of these practices, we sampled zooplankton prey of juvenile Chinook salmon to investigate fine-scale taxonomic and temporal differences in ED. Using a recently developed model to estimate the ED of organisms using percent ash-free dry weight, we compared energy content of several groups that are typically grouped together in growth studies. Decapod megalopae were more energy rich than zoeae and showed family-level variability in ED. Amphipods showed significant species-level variability in ED. Temporal differences were observed, but patterns were not consistent among groups. Bioenergetic model simulations showed that growth rate of juvenile Chinook salmon was almost identical when prey ED values were calculated on a fine scale or on a taxon-averaged coarse scale. However, single-species representative calculations of prey ED yielded highly variable output in growth depending on the representative species used. These results suggest that the latter approach may yield significantly biased results.

scholarly journals Empirically Estimating Carrying Capacity for Juvenile Chinook Salmon

2021 ◽  
Vol 102 (2) ◽  
Author(s):  
Kevin E. See ◽  
Michael W. Ackerman ◽  
Richard A. Carmichael ◽  
Sarah L. Hoffmann ◽  
Chris Beasley
Keyword(s):  
Chinook Salmon ◽  
Carrying Capacity ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook
Sign in / Sign up

Export Citation Format

Share Document