Migratory origin of Pacific saury, Cololabis saira, caught by drift net fishing in summer in the eastern waters off Hokkaido [Japan]
2009
Natsume, M.(Hokkaido. Central Fisheries Experiment Station, Yoichi (Japan)) | Mori, Y. | Tuji, K.
In order to elucidate the migratory origin of Pacific saury, Cololabis saira, caught by drift net fishing in summer in the eastern waters off Hokkaido, we examined the biological characteristics of the Pacific saury caught by stick-held dip net fishing and drift net fishing in the southeastern waters of Hokkaido, and specimens collected during a research vessel survey of the waters extending between Tohoku, and east Hokkaido. Pacific saury caught by drift net fishing was characterized by a high parasitism rate of Caligus macarovi, low lipid content, and advanced maturity. These characteristics were similar to those determined by the research vessel survey but differed from those determined from specimens caught by stick-held dip net fishing. These results indicate that Pacific saury caught by drift net fishing originated from a shoal of Pacific saury migrating northward along northeastern Honshu between spring and summer.
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