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BLACK SPOT INFESTATION IN JUVENILE COHO SALMON AND THE INFLUENCE OF OREGON COASTAL STREAM SUMMER TEMPERATURES
Citation:
Cairns, M A., J L. Ebersole, J P. Baker, H. Lavigne, S. M. Davis, AND P. J. WIGINGTON JR. BLACK SPOT INFESTATION IN JUVENILE COHO SALMON AND THE INFLUENCE OF OREGON COASTAL STREAM SUMMER TEMPERATURES. Presented at American Fisheries Society Annual Meeting, Madison, WI, August 22-26, 2004.
Description:
Freshwater survival and growth of juvenile salmon are affected by many factors, including high summer temperatures and other stressors such as parasitism. Delayed or suppressed growth related to stress can influence subsequent survival of juvenile salmonids in freshwater and marine environments, potentially influencing adult returns. To better understand stressors influencing seasonal growth and survival of juvenile coho salmon (Oncorhynchus kisutch), we quantified the summer occurrence of the trematode Neascus sp. in juvenile coho salmon in the West Fork Smith River, Oregon, and its relationship to location within the stream network and habitat conditions. Neascus infestation rate was positively associated with high summer water temperatures and was negatively associated with apparent survival and growth of juvenile coho. These patterns indicate that summer habitat conditions and parasitism may influence coho salmon growth and survival through subsequent life stages.