Journal
ENVIRONMENTAL BIOLOGY OF FISHES
Volume 88, Issue 1, Pages 79-84Publisher
SPRINGER
DOI: 10.1007/s10641-010-9619-8
Keywords
Migration; Swimming; Behavior; Diel effects; Flow table; Coho Salmon
Categories
Funding
- Marin Rod and Gun Club, Granite Bay Flycasters
- California Fly Fishers Unlimited
- UC Davis Jastro-Shields
- Humanities Research Funds
- California Department of Water Resources
- U.S. Bureau of Reclamation
- CALFED Bay-Delta Program
- Anadromous Fish Screen Program
- UC Agricultural Experiment Station [3455-H]
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Juvenile Coho Salmon undergo many physiological changes during their springtime transformation from a freshwater parr to a migratory, seawater-capable smolt. Although field observations indicate smolts moving towards the surface and across the breadth of their streams to either swim or drift downstream with the current, water-velocity preferences of these developing cohos are unknown. Using video analysis of their swimming patterns in a calibrated, laboratory flow table with a velocity gradient, groups of three cohos generally increased their preferred water velocity through the springtime study period, to a late-May peak (daytime data, change-point regression analysis, p < 0.05) and over the entire period (nighttime data, regression analysis, p < 0.05). Moving to swifter currents should facilitate the downstream movements of these young cohos, as they develop through the parr-smolt transformation period. This information should assist managers of regulated watersheds and salmon hatcheries in optimizing juvenile salmon survival (e.g., with timely, late-spring water releases producing 0.1-0.3 m s(-1) downstream water velocities).
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