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.
|Title||Early marine growth in relation to marine-stage survival rates for Alaska sockeye salmon (<i>Oncorhynchus nerka</i>)|
|Authors||Edward V. Farley, J. M. Murphy, Milo D. Adkison, Lisa B. Eisner, J.H. Helle, J.H. Moss, Jennifer L. Nielsen|
|Publication Subtype||Journal Article|
|Series Title||Fishery Bulletin|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Alaska Science Center|