Movement of the fluvial form of masu salmon, Oncorhynchus masou masou, in a mountain stream in Kyushu, Japan

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 mo...

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Bibliographic Details
Published in:Fisheries science 2005-04, Vol.71 (2), p.333-341
Main Authors: Sakata, K. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture), Kondou, T, Takeshita, N, Nakazono, A, Kimura, S
Format: Article
Language:English
Subjects:
ANIMAL MIGRATION
BREEDING SEASONS
Fish
Freshwater
Genetic engineering
HIGHLANDS
Japan
mark–recapture methods
mountain stream
movement
ONCORHYNCHUS MASOU
Oncorhynchus masou masou
RIVERS
Salmon
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Summary: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.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2005.00969.x