Effects of stock, coded-wire tagging, and transplant on straying of pink salmon (Oncorhynchus gorbuscha) in southeastern Alaska

Straying of pink salmon (Oncorhynchus gorbuscha) from two wild stocks (intertidal and upstream) in southeastern Alaska was estimated. Secondary factors (coded-wire tagging and transplanting of the intertidal stock) that may influence straying were also evaluated. In 1996, 321 494 fry were marked wit...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2000-10, Vol.57 (10), p.2076-2085
Main Authors: Thedinga, J F, Wertheimer, A C, Heintz, R A, Maselko, J M, Rice, S D
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal and plant ecology
Animal migration
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Electronic monitoring
Fish
Fish stocking
Fisheries
Freshwater
Fundamental and applied biological sciences. Psychology
Marine
Oncorhynchus gorbuscha
Salmon
USA, Alaska
Vertebrata
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Summary:Straying of pink salmon (Oncorhynchus gorbuscha) from two wild stocks (intertidal and upstream) in southeastern Alaska was estimated. Secondary factors (coded-wire tagging and transplanting of the intertidal stock) that may influence straying were also evaluated. In 1996, 321 494 fry were marked with either coded-wire tags or pelvic-fin clips. A total of 3828 marked adults were recovered in their natal streams and 79 strays were recovered in streams within 60 km of the release sites. The overall estimated straying rate was 5.1%. Estimated straying for the intertidal stock (9.2%) was higher than straying of the upstream stock (3.7%) but was not statistically different due to high variance of the estimates. The proportion of fish straying was significantly greater (P = 0.01) for coded-wire-tagged than for pelvic-fin-clipped fish for the upstream but not for the transplanted stock. Straying and distribution of the transplanted stock were more similar to those of the upstream stock, which was endemic to the natal watershed and release site of the transplant, than to those of the intertidal stock, which was the donor stock for the transplant. Although tagging may influence straying, incubation and initial estuarine environment appear to be major determinants of the natural straying of pink salmon in southeastern Alaska.
ISSN:0706-652X
1205-7533
DOI:10.1139/f00-163