Restricted movement of the fluvial form of red-spotted masu salmon, Oncorhynchus masou rhodurus, in a mountain stream, central Japan.

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Movement of the fluvial form of red-spotted masu salmon (1<SUP>+</SUP> and older), <I>Oncorhynchus masou rhodurus</I>, was studied using mark-recapture methods in a Japanese mountain stream. Most (63-91%) adult salmon were recaptured in the pool in which they were marked. The rest of the salmon moved upstream or downstream<20m during the non-breeding period. The proportion of the salmon moving increased slightly during the breeding period, but did not exceed 66%. The distance moved was also more variable during this period. The proportion of the smaller salmon which moved was larger than that of the larger fish during the non-breeding period. Conversely, during the breeding period, larger fish moved more frequently. Sedentary behaviour and local movements of adult salmon seem to be affected by their social relationships.
日本魚類学会の論文