Trout Management Flows

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The purpose of implementing trout management flows is to evaluate methods for using releases from Glen Canyon Dam to reduce the production of large numbers of age-0 rainbow trout in order to improve the quality of the Lees Ferry trout fishery and conserve the endangered humpback chub and other native fishes in Grand Canyon. [1] We identified three objectives that need to be addressed to support management decision making: Sustain a healthy Lees Ferry trout population with a balanced age and size structure; Reduce annual production rates of rainbow trout in the Lees Ferry reach; Reduce emigration rates of rainbow trout from Lees Ferry to downstream reaches occupied by humpback chub.

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Updates Information Trout Management Flows may be more effective if targeted towards juvenile trout and not eggs or hatchlings. Juvenile trout are susceptible to fluctuating flows (adults are less so). Reducing the number or density of juvenile trout at Lees Ferry may: reduce downstream migration (emigration) and conflicts with humpback chub reduce competition with adult trout and maintain/improve the Lees Ferry trout fishery (size, condition) Presentations and Papers 2012 A Research and Monitoring Plan for Evaluating Trout Management Flows below Glen Canyon Dam 2010 Hourly and Seasonal Variation in Nearshore Habitat Use by Age-0 Rainbow Trout In Lees Ferry: Implications for Nonnative Fish Suppression Flow Experiments Other Stuff