ホツケ(Pleurogrammus azonus)の食餌並に漁場プランクトンの觀察
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概要
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The stomachs of spring atka-fish caught with seine net at the fishing grounds around Rumo, Hokkaido, are principally distended with microcrustaceans, Calanus plumchus. In addition, some of the stomachs contain a considerable quantity of Euphausia lanei and herring eggs. However, at the latest period of the fishing season more diverse forms of diet are found in the stomachs. The fish aggregate in a crowd in order to feed on Calanus plumchrus when the latter is densely crowded into a patch. When the northerly curren prevails, Calanus is abundantly concentrated along the border line of the tidal current, and successful catch of atka-fish by seine net is expected under such circumstances.