Early marine growth in relation to marine-stage survival rates for Alaska sockeye salmon (Oncorhynchus nerka)
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Abstract
We tested the hypothesis that larger juvenile sockeye salmon (Oncorhynchus nerka) in Bristol Bay, Alaska, have higher marine-stage survival rates than smaller juvenile salmon. We used scales from returning adults (33 years of data) and trawl samples of juveniles (n= 3572) collected along the eastern Bering Sea shelf during August through September 2000−02. The size of juvenile sockeye salmon mirrored indices of their marine-stage survival rate (e.g., smaller fish had lower indices of marine-stage survival rate). However, there was no relationship between the size of sockeye salmon after their first year at sea, as estimated from archived scales, and brood-year survival size was relatively uniform over the time series, possibly indicating size-selective mortality on smaller individuals during their marine residence. Variation in size, relative abundance, and marine-stage survival rate of juvenile sockeye salmon is likely related to ocean conditions affecting their early marine migratory pathways along the eastern Bering Sea shelf.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Early marine growth in relation to marine-stage survival rates for Alaska sockeye salmon (Oncorhynchus nerka) |
| Series title | Fishery Bulletin |
| Volume | 105 |
| Issue | 1 |
| Year Published | 2007 |
| Language | English |
| Publisher | United States National Marine Fisheries Service |
| Contributing office(s) | Alaska Science Center |
| Description | 10 p. |
| First page | 121 |
| Last page | 130 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |