北日本の太平洋海域における離岸期サケ稚魚の分布
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概要
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The geographical and seasonal distribution of juvenile chum salmon Oncorhynchus keta were surveyed off the Pacific coasts of Hokkaido and Honshu from May to July, 1981-84. Juvenile chum salmon were sampled either by spoon nets or angling combined with a fish lamp, and purse seine. A total of 1845 juveniles of 3-14 cm in fork length were collected, 88% of them were over 8cm FL. They were found in the coastal waters within 100 km of the nearest shore. In the waters off Hokkaido the juveniles were abundant within 30 km of the shore. It was suggested that the juvenile chum salmon of 8-11 cm FL were in the process of offshore migration. The migrating juveniles occurred from late May to early June in the waters from the eastern mouth of Tsugaru Strait to Hidaka, and from mid-June to late June, they were found in large numbers in the offshore area of Tohoku, Honshu. Then, they seemed to be concentrated in the coastal waters, from early July toward mid-July, along the Pacific coast of Hokkaido, Hidaka to Akkeshi.
- 社団法人 日本水産学会の論文