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Predation of Karluk River sockeye salmon by coho salmon and char

January 1, 1988

The number of sockeye salmon, Oncorhynchus nerka, in Alaska's Karluk River (Fig. 1) declined from millions to thousands during the early part of the present century. Rounsefell (1958) discussed alternative explanations for the decline including a general loss offertility ofthe system as the number of salmon carcasses declined, competition, overfishing, subtle changes in climate, and predation; he concluded that the combined effect of predation and fishing was the most probable explanation. Later, Van Cleave and Bevan (1973) suggested that the weir constructed in the river each year to facilitate counting the fish as they entered the system was the most probable cause ofthe decline. Itprevented free movement of both adults and juveniles in the river. All of these hypotheses remain as potential explanations for the decline

Publication Year 1988
Title Predation of Karluk River sockeye salmon by coho salmon and char
Authors J.D. McIntyre, R.R. Reisenbichler, J.M. Emlen, R.L. Wilmot, J.E. Finn
Publication Type Article
Publication Subtype Journal Article
Series Title Fishery Bulletin
Index ID 70162045
Record Source USGS Publications Warehouse
USGS Organization Western Fisheries Research Center