Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou |
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| Authors: | Yasuyuki Miyakoshi Mitsuhiro Nagata Shuichi Kitada |
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| Institution: | Hokkaido Fish Hatchery, Eniwa, Hokkaido 061-1433 and;Department of Aquatic Biosciences, Tokyo University of Fisheries, Minato, Tokyo 108-8477, Japan |
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| Abstract: | SUMMARY: The relationship between mean weights of hatchery-reared masu salmon Oncorhynchus masou smolts at release and the subsequent recovery rates by coastal commercial fisheries in Hokkaido, northern Japan, was investigated using the maximum likelihood method. A strongly positive correlation was observed, showing smolts with a mean of 32.6 g obtained an approximately 20-fold recovery rate of those with a mean of 14.8 g. The model with log-transformed independent variable ( Yi = –11.237 + 4.239 ln Xi ) was selected as the most parsimonious model to represent the release size ( Xi ) and recovery rate ( Yi ) relationship. |
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| Keywords: | Akaike information criterion masu salmon maximum likelihood method Oncorhynchus masou smolt size |
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