Early marine growth in relation to marine-stage survival rates for Alaska sockeye salmon (Oncorhynchus nerka)
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 mirroredindices 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 ofsockeye 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 individualsduring their marine residence. Variation in size, relative abundance, and marine-stage survival rate of juvenilesockeye salmon is likely related to ocean conditions affecting their early marine migratory pathways along theeastern Bering Sea shelf.
Main Authors: | , , , , , , |
---|---|
Format: | article biblioteca |
Language: | English |
Published: |
2007
|
Subjects: | Biology, Ecology, Fisheries, |
Online Access: | http://hdl.handle.net/1834/25558 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|