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Specimens of sea run type oncorhynchus rhodurus collected in the coastal waters of the hokuriku and tohoku regions in the japan sea



Specimens of sea run type oncorhynchus rhodurus collected in the coastal waters of the hokuriku and tohoku regions in the japan sea



Bulletin of the Japan Sea National Fisheries Research Institute (33): 55-66



In surveying the young masu salmon in the coastal areas of the Japan Sea, the sea-run type fish of amago O. rhodurus Jordan and McGregor, were collected and some biological studies were carried out. From April 16, 1979 to May 8, 1982, 33 sea-run fish of O. rhodurus were caught off the coast of Hokuriku and Tohoku region, in the Japan Sea. Nine were caught off Sado Island, 12 off Niigata City, 1 off Yamagata and 11 off Toyama prefecture. This is the 2nd catch record of sea-run type O. rhodurus in the Japan Sea, since Kato (1978) found for the 1st specimen of the Echizen coast. The size of O. rhodurus collected ranged from 151-410 mm fork length and from 34-1000 g body wt. They consisted of fish staying in the coastal sea after descending the stream and homing to the river where they were spawned. Because amago O. rhodurus were introduced artificially into Toyama, Yamagata and Niigata prefecture, except for Sado Island, it is presumed that the origin of O. rhodurus caught in the coastal seas of these 3 prefectures are the fish transplanted previously. There is no record of the transplantation of O. rhodurus into Sado Island, so it is necessary to further investigate the origin of small specimens caught off the coast of Sado Island.

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