Bull trout life history, genetics, habitat needs, and limiting factors in central and northeast Oregon, annual report 1998.

[摘要] This section describes work accomplished in 1998 that continued to address two objectives of this project. These objectives are 1) determine the distribution of juvenile and adult bull trout and habitats associated with that distribution, and 2) determine fluvial and resident bull trout life history patterns. Completion of these objectives was approached through studies of bull trout in the Grande Ronde, Walla Walla, and John Day basins. These basins were selected because they provide a variety of habitats that range from relatively degraded to pristine, and bull trout populations thought to vary from relatively depressed to robust. In all three basins we used radio telemetry to describe the seasonal movements of bull trout. In two of these basins we also used traps to collect biological information and to provide insights to bull trout life histories. In the John Day basin, we captured adult and juvenile bull trout from the upper mainstem John Day River and its tributaries Call Creek, Deardorff Creek, and Roberts Creek. In the Walla Walla basin, we captured adult and juvenile bull trout from Mill Creek. In the Grande Ronde basin, we captured adult bull trout from the Wenaha River and Lookingglass Creek. Some juvenile bull trout were also captured from Catherine Creek.

[发布机构] Technical Information Center Oak Ridge Tennessee

[学科分类] 工程和技术（综合）

[关键词] Oregon;Trout;Genetics;Habitat;Fishes