Ocean Carrying Capacity : Recovery Issues for Threatened and Endangered Snake River Salmon : Technical Report 6 of 11.
The northeast Pacific is comprised of four fishery production domains: The gulf of Alaska, a coastal downwelling zone, a coastal upwelling zone and a transition zone. Salmon from the Columbia River enter the sea in the upwelling zone. Marine survival of coho salmon in the Oregon Production Index area has been the subject of extensive study. Variability in marine survival of coho salmon appears to be determined in the first month at sea while the fish are still in local marine areas in the upwelling zone. There is stronger evidence that upwelling might influence vulnerability to predation. A broader ecosystem view which considers salmon as a member of a complex marine community offers additional insight and raises new questions regarding the marine mortality of salmon. The pelagic fish community in the upwelling zone has undergone dramatic change in the last 50 years. That change is consistent with the historical record, however, the system has not completed a full cycle of change (as it has in the past) since the stocks have been subjected to intense commercial and sport exploitation. Salmon seem to be responding to shifts in productivity in the coastal upwelling zone.
- Research Organization:
- S.P. Cramer & Associates, Inc.
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- AM79-93BP99654
- OSTI ID:
- 10180323
- Report Number(s):
- DOE/BP-99654-6; ON: DE93019482
- Country of Publication:
- United States
- Language:
- English
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