Stock Abundance Dynamics of Azabachye Lake and Dvukhyurtochnoye Lake Sockeye Salmon (Oncorhynchus nerka) from the Results of Sockeye Salmon Origin Identification in the Coastal and River Catches of Kamchatka River Basin

摘要

The Azabachye Lake sockeye salmon "A" stock inhabiting the lower reaches of the Kamchatka River, is very abundant and contributes up to 50-60% of the total Kamchatka River catch in some years. The sockeye salmon "D" stock reproducing in Dvukhyurtochnoye Lake basin is the next most abundant stock and contributes from 3 to 10% (maximum - 15-20%'; of the Kamchatka River total sockeye salmon stock.rnFrom the results of sockeye salmon complex identification; including the analysis of fresh-water scale zone (Bugayev 1983, 1986), the frequency of Diphyllobothrium sp. infection, and the time of harvest; the contribution of "A" and "D" stocks in total Kamchatka River sockeye salmon coastal and in-river escapement has been estimated for the period from 1978 to 2002. The results provided accurate estimation of "A" and "D" stock contributions to the fishery for the period 1957-1977.