Upstream Passage, Spawning, and Stock Identification of Fall Chinook Salmon in the Snake River, 1992 : Annual Report FY 92-93.
This report summarizes the activities and results for the second year (1992) of a three year study. The goals of the study were as follows: (1) to determine the source (s) of interdam losses of adult fall chinook salmon between Ice Harbor Dam (IHR) and Lower Granite Dam (LGR), as well as upstream of LGR; (2) identify spawning locations upstream of LGR for calibration of aerial redd surveys, and to assist with redd habitat mapping and carcass recovery (for genetic stock profile analysis). Radio telemetry was used as the method of addressing project goals. Unmarked (not adipose clipped) adult fall chinook salmon were trapped and radio tagged at IHR and LGR dams as they ascended the Snake River during their spawning migration. They used aerial and ground mobile radio tracking to determine the movements of these fish. They examined movements of all radio tagged salmon upstream of LGR Dam. That provided us with a sample of 17 radio tagged fish tagged at IHR and 20 tagged at LGR. They estimate a combined fall back rate at LGR of 37.1% (13 fish). Another 10.8--13.5% were `lost` or prespawning mortalities. They identified two potential spawning locations that would not have been detected from the aerial spawning surveys. One site was upstream of Troy on the Grande Ronde River and the other was in the upper Snake River.
- Research Organization:
- Washington Department of Fisheries
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- BI79-92BP60415
- OSTI ID:
- 142504
- Report Number(s):
- DOE/BP-60415-1; ON: DE94008556; TRN: AHC29407%%36
- Resource Relation:
- Other Information: PBD: Dec 1993
- Country of Publication:
- United States
- Language:
- English
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