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 |
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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 |