Managing adult hatchery summer steelhead for a recreational fishery with reduced hatchery and wild interactions
I evaluated the fish recycling program on the Clackamas River. Recycling involves the transport and release of adult steelhead back downstream following their collection at the hatchery to increase angler success. I estimated that up to 41% of recycled fish were caught in the recreational fishery. However, the majority of fish (44 -67%) were unaccounted for after release and may negatively affect wild populations. The Oregon Department of Fish and Wildlife is investigating the feasibility of sterilizing returning adult hatchery steelhead to reduce hatchery and wild interactions and increase recreational fishing opportunity. To evaluate the effect of sterilization on adult fish behavior, I gonadectomized and radio-tagged 40 hatchery summer steelhead and monitored their behavior and contribution to the fishery compared to sham-operated fish. Gonadectomized fish remained in the river, were distributed downstream of control fish, and were caught in the recreational fishery. Based on my results, I conclude that sterilization may be a useful technique to improve angler opportunity while minimizing the impact to wild fish. Behavior and activity of hatchery fish and their responses to management procedures should be closely monitored to better manage hatchery fisheries.
Advisor:Noakes, David L. G.; Schreck, Carl B.; Torgersen, Christian E.; Clements, Shaun
School:Oregon State University
School Location:USA - Oregon
Source Type:Master's Thesis
Keywords:hatchery fisheries management steelhead gonadectomy telemetry electromyogram transmitters fishes monitoring oregon clackamas river fish fishery resources vs wild stocks
Date of Publication:03/30/2009