Age and Marine Survival of Ocean-Type Chinook Salmon Oncorhynchus tshawytscha from the Situk River, Alaska
Thedinga JF, Johnson S, Koski KV. 1998. Age and Marine Survival of Ocean-Type Chinook Salmon Oncorhynchus tshawytscha from the Situk River, Alaska. Alaska Fishery Research Bulletin. 5(2):143-148
Chinook salmon Oncorhynchus tshawytscha smolts were sampled for scales, coded-wire-tagged, and released in the Situk River, Alaska. As returning adults, they were then sampled for scales to compare freshwater age composition at release and recovery and to estimate marine survival. Of 10,191 chinook salmon smolts tagged (July 1989), 98% were age 0. From 1991 through 1993, 23 of 35 tagged chinook salmon adults recovered in the commercial fishery and spawning-ground surveys had readable scales that identified 87% of the fish as age 0. (ocean-type). Estimated marine survival was 2.9%, excluding returning age-0.1 jacks. We concluded that ocean-type chinook salmon are the predominate life history type for the Situk River. Situk River chinook salmon are unique because they are the only known stock in Alaska that migrates to sea primarily at age 0. [near Yakutat]
- Type
- Journal Article
- Authors
- Thedinga, J; Johnson, SW; Koski, K
- Units
- GLBA , SITK , WRST
- Keywords
- Anadromous Fish, Fish/Ichthyology, Gulf Of Alaska, Salmon, Situk River, survival (salmon), Yakutat Bay