Distribution and movement of domestic rainbow trout, <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis>, during pulsed flows in the South Fork American River,California |
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| Authors: | Sarah A Cocherell Gardner J Jones Javier B Miranda Dennis E Cocherell Jr" target="_blank">Joseph J CechJr Lisa C Thompson 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) California Department of Water Resources, P.O. Box 942836, Sacramento, CA 94236-0001, USA; |
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| Abstract: | We tracked the movements of ten small (SL = 25.5–31.0 cm) and ten large (SL = 32.0–38.5 cm) radio-tagged domestic rainbow
trout (Oncorhynchus mykiss) in response to frequent pulsed releases of water in the South Fork American River (California) from July to October 2005.
In week one all the small trout moved less than 1 km upstream or downstream of their release sites. Four small trout moved
1–3 km upstream or downstream of their release sites in the following 8 weeks. Seven out of ten large trout moved downstream
after their release. In subsequent weeks most large trout showed smaller upstream and downstream movements, and were observed
between 1 km upstream and 8 km downstream of their release sites. Our results suggest that domestic rainbow trout with SL > 25 cm
are not forced downstream by daily pulsed flow increases from 5 to over 40 m3s−1. |
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