Bull Trout Life History, Genetics, Habitat Needs, and Limiting Fact in Central and Northeast Oregon. Annual Report 1999.
This section describes work accomplished in 1999 that continued to address two objectives of this project. These objectives are (1) determine the distribution of juvenile and adult bull trout Salvelinus confluentus and habitats associated with that distribution, and (2) determine fluvial and resident bull trout life history patterns. Completion of these objectives is intended 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, from relatively degraded to pristine, and bull trout populations were thought to vary from relatively depressed to robust. In all three basins we used radio telemetry to determine the seasonal movements of bull trout. In the John Day and Walla Walla basins we also used traps to capture migrant bull trout. With these traps, we intended to determine the timing of bull trout movements both upstream and downstream, determine the relative abundance, size and age of migrant fish, and capture bull trout to be implanted with radio transmitters. In the John Day basin, we captured adult and juvenile bull trout from the upper John Day River and its tributaries, Call Creek, Reynolds Creek, and Roberts Creek. In the Walla Walla basin, we captured adult and juvenile bull trout from Mill Creek.
- Research Organization:
- Oregon Dept. of Fish and Wildlife, Portland, OR (US); USDA Forest Service, La Grande, OR (US)
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- 94BI34342
- OSTI ID:
- 787947
- Report Number(s):
- DOE/BP-34342-3; Contract 1994BI34321; TRN: AH200135%%154
- Resource Relation:
- Other Information: PBD: 1 Aug 2001
- Country of Publication:
- United States
- Language:
- English
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