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Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou

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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; Oncorhynchus masou; masu salmon; maximum likelihood method; smolt size

Document Type: Research Article

Affiliations: 1: Hokkaido Fish Hatchery, Eniwa, Hokkaido 061-1433 and 2: Department of Aquatic Biosciences, Tokyo University of Fisheries, Minato, Tokyo 108-8477, Japan

Publication date: 2001-02-01

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