Movement of the fluvial form of masu salmon, <Emphasis Type="Italic">Oncorhynchus masou masou</Emphasis>, in a mountain stream in Kyushu,Japan |
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| Authors: | Email author" target="_blank">Kazuhiro?SakataEmail author Takuya?Kondou Naohiko?Takeshita Akinobu?Nakazono Seir??Kimura |
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| Institution: | (1) Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University, 812-8581 Fukuoka, Japan;(2) Department of Applied Aquabiology, National Fisheries University, 759-6595 Shimonoseki, Yamaguchi, Japan;(3) Present address: 4-2-24 Kashii, 813-3001 Fukuoka, Japan |
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| Abstract: | Using mark-recapture methods, the movements of the fluvial form of masu salmon (Oncorhynchus masou masou) in a mountain stream on the island of Kyushu, Japan, were studied. Most (78%) of the masu salmon were recaptured in the
pool in which they had been originally caught and tagged. Of those that moved between pools, the proportion of individuals
that moved during the breeding period was not significantly higher than the proportion that moved during the non-breeding
period. However, during the breeding period, a higher proportion of larger salmon moved than did smaller fish. The proportion
of mobile large males during breeding period was higher than that for small males. Also, it was found that a few individuals
showed long-range movement in the autumn. As a long-term movement, 78 individual fish (65%) that were recaptured more than
three times showed high sedentary tendencies. Sixteen individual mobile fish (13%) moved and returned to the original pool.
Fluvial form of masu salmon in Kyushu show a high sedentary nature; however, large mature males seem to actively move in search
of female during breeding period. |
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| Keywords: | Japan mark-recapture methods mountain stream movement Oncorhynchus masou masou |
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