Did volcanic ash from Mt. Kasatoshi in 2008 contribute to a phenomenal increase in Fraser River sockeye salmon (Oncorhynchus nerka) in 2010?
Article first published online: 8 JUN 2012
© 2012 Blackwell Publishing Ltd
Volume 21, Issue 5, pages 374–377, September 2012
How to Cite
PARSONS, T. R. and WHITNEY, F. A. (2012), Did volcanic ash from Mt. Kasatoshi in 2008 contribute to a phenomenal increase in Fraser River sockeye salmon (Oncorhynchus nerka) in 2010?. Fisheries Oceanography, 21: 374–377. doi: 10.1111/j.1365-2419.2012.00630.x
- Issue published online: 19 JUL 2012
- Article first published online: 8 JUN 2012
- Received 11 March 2012 Revised version accepted 4 April 2012
- Fall bloom;
- Fraser River;
- Gulf of Alaska;
- sockeye salmon
The effect of a widely distributed phytoplankton bloom triggered by volcanic ash from Alaska (Hamme et al., 2010. Geophys. Res. Lett. 37) on juvenile Fraser River sockeye is discussed in terms of the timing of ocean migration and trophic structure of the Gulf of Alaska. Our hypothesis is that the occurrence of a massive diatom bloom in the Gulf greatly enhanced energy ascendancy in the ocean at a time of year when adolescent sockeye migrated from the coast in 2008. We contend this increase in food availability was an important factor for the survival and growth of juvenile sockeye which led to one of the strongest sockeye returns on record in 2010 of 34 million, compared with perhaps the weakest return on record of 1.7 million the previous year.