噴火湾およびその沖合におけるアカガレイの分布・移動について

日本農学文献記事索引 HANDLE 被引用文献1件 オープンアクセス

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  • Distribution and Migration of Hippoglossoides dubius in Funka Bay and Its Offshore Waters, Hokkaido

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In order to investigate the relation between distribution and migration of Hippoglossoides dubius and water temperature in Funka Bay and its offshore waters at a depth less than 200m, sampling surveys and tagging experiments were conducted from April 1984 to November 1988. In February, H. dubius were found chiefly in southern part of the bay (less than 78m depth). In this period, Oyashio Current entered the bay and the bottom water of 2.0~4.0℃ temperature prevailed with small variations among stations. From May to Ju1y, they concentrated in the muddy and deep area (more than 80m depth) in the bay, although the bottom water temperature remained uncharged except for high temperature (8.1℃) in the northeastern part of the bay in July. Between August and November, bottom water temperature in the northeastern part of the bay mouth and the coastal zone in the bay were as high as 8.1~12.3℃, whereas that in the deepest area of the bay was 4.0~9.0℃, where H. dubius concentrated. A total of 2655 H. dubius were tagged and released. Ninety-three tegged H. dubius were recaptured mainly in the bay and 79 tagged fish of them were recaptured within a year after release. From July to September they migrated southward and that northward after October. Seasonal change in the distribution and the results of tagging experiments suggested that H. dubius inhabited in the bay all the year round.

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