We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Can behavioral fish-guidance devices protect juvenile Chinook salmon ( Oncorhynchus tshawytscha) from entrainment into unscreened water-diversion pipes?
- Authors
Mussen, Timothy D.; Patton, Oliver; Cocherell, Dennis; Ercan, Ali; Bandeh, Hossein; Kavvas, M. Levent; Cech, Joseph J.; Fangue, Nann A.; Post, John
- Abstract
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.
- Subjects
CHINOOK salmon; WATER diversion; BIOLOGICAL extinction; EFFECT of human beings on fishes; AQUATIC habitats; PREVENTION
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 8, p1209
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0601