Rainbow trout <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> energetic responsesto pulsed flows in the American River,California, assessed by electromyogram telemetry |
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Authors: | Sarah A Cocherell Dennis E Cocherell Gardner J Jones Javier B Miranda Lisa C Thompson Jr" target="_blank">Joseph J CechJr A Peter Klimley |
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Institution: | (1) Wildlife, Fish, & Conservation Biology Department, University of California Davis, 1 Shields Avenue, Davis, CA 95616-8751, USA;(2) Present address: California Department of Water Resources, 1416 9th Street, Room 252-35, Sacramento, CA 95814, USA; |
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Abstract: | Although rainbow trout Oncorhynchus mykiss within the American River, California, apparently exhibit minimal upstream or downstream movements in response to hydroelectric-power-generation-related
pulsed flows, the associated energetic costs are unknown. We implanted rainbow trout (n = 9, ≥30 cm SL) with electromyogram (EMG)-sensor-equipped radio transmitters to assess the swimming behavior and associated
energetic costs associated with their responses to pulsed flows. Using laboratory calibrations in a Brett-type swimming respirometer,
the trouts’ swimming speeds and oxygen consumption rates were estimated for their in-river EMG data, through a complete hydroelectric
power-generation river pulsed-flow sequence (pre-pulse, increasing flow, peak, and decreasing flow stages), on several (mean:
3.2) sampling dates. Using a mixed-linear model, we found that fish swimming speed estimates increased during the increasing
flow stage, while the associated mean oxygen consumption rates also increased at this stage. At river flows near the usual
peak (>44 m3s−1), swimming speeds and movement rates decreased, possibly due to the fish using the river’s habitat complexities as hydraulic
cover. We conclude that rainbow trout incur increased swimming-related energetic costs during increasing flows and, potentially,
decreased foraging opportunities at high flows. |
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