Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 1997 Annual Report.
This project monitored the daily passage of chinook salmon Oncorhynchus tshawytscha and steelhead trout O. mykiss smolts during the 1997 spring out-migration at migrant traps on the Snake River and Salmon River. All hatchery chinook salmon released above Lower Granite Dam were marked with a fin clip in 1997. Total annual hatchery chinook salmon catch at the Snake River trap was 49% of the 1996 number but only 6% of the 1995 catch. The wild chinook catch was 77% of the 1996 but was only 13% of 1995. Hatchery steelhead trout catch was 18% of 1996 numbers but only 7% of the 1995 numbers. Wild steelhead trout catch was 22% of 1996 but only 11% of the 1995 numbers. The Snake River trap collected eight age-0 chinook salmon and one sockeye/kokanee salmon O. nerka. Differences in trap catch between years are due to fluctuations not only in smolt production, but also differences in trap efficiency and duration of trap operation associated with high flows. Trap operations were terminated for the season due to high flows and trap damage on May 8 and were out of operation for 23 d due to high flow and debris. Hatchery chinook salmon catch at the Salmon River trap was 37% and wild chinook salmon catch was 60% of 1996 numbers but only 5% and 11% of 1995 catch, respectively. The 1997 hatchery steelhead trout collection was 13% of the 1996 catch and 32% of the 1995 numbers. Wild steelhead trout collection in 1997 was 21% of the 1996 catch and 13% of the 1995 numbers. Trap operations were terminated for the season due to high flows and trap damage on May 7 and were out of operation for 19 d due to high flow and debris.
- Research Organization:
- Idaho Department of Fish and Game (IDFG)
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- 1983BP11631
- OSTI ID:
- 801463
- Report Number(s):
- DOE/BP-11631-15; TRN: US200220%%957
- Resource Relation:
- Other Information: PBD: 1 Apr 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam; Smolt Monitoring by Federal and Non-Federal Entities, 2000 Annual Report.
Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 2003 Annual Report.
Related Subjects
EFFICIENCY
FLUCTUATIONS
GRANITES
MONITORING
PRODUCTION
RIVERS
SALMON
SEASONS
SNAKES
TROUT
CHINOOK SALMON - MIGRATION - SNAKE RIVER WATERSHED (WYO.-WASH.)
STEELHEAD (FISH) - MIGRATION - SNAKE RIVER WATERSHED (WYO.-WASH.)
ANADROMOUS FISHES - MIGRATION - IDAHO
ANADROMOUS FISHES - MIGRATION - WASHINGTON (STATE)