Effects of smolt size and timing of migration on recovery rate of wild masu salmon <Emphasis Type="Italic">Oncorhynchus masou</Emphasis> |
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Authors: | Yasuyuki Miyakoshi Sei-Ichi Saitoh |
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Institution: | (1) Salmon and Freshwater Fisheries Research Institute, Hokkaido Research Organization, 3-373 Kitakashiwagi-cho, Eniwa Hokkaido, 061-1433, Japan;(2) Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate Hokkaido, 041-8611, Japan |
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Abstract: | Little is known about the survival rate of wild masu salmon Oncorhynchus masou. To examine the effects of smolt length and migration timing on the recovery rate of wild masu salmon, we reanalyzed past
tagging and recovery data (1993–1994). The tagging study was conducted in the Shokanbetsu River, northern Japan; 863 wild
masu salmon smolts were captured, tagged, and released in a downstream site, and a total of 19 fish were recovered in coastal
fisheries and in the natal river the following year. The data were analyzed by a logistic regression analysis with recapture
as a response variable and tagging date and smolt length as explanatory variables; the tagging date had a significant effect
on the recapture rate, whereas the effect of smolt size was not significant. Despite the small number of recaptures, this
study indicates that migration timing is a factor affecting the marine survival of wild masu salmon smolts, although this
conclusion has been repeatedly documented for other species of Pacific salmon Oncorhynchus spp. |
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