Feeding Habits of Young Masu Salmon, Oncorhynchus masou in Coastal Waters near Oshika Peninsula, Honshu, Japan.

概要

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Young masu salmon were collected with set nets or from fish markets near Oshika Peninsula to observe their stomach contents during the period from 1981 to 1986. Food composition was analyzed with 4 different indices, that is, number of individual, weight, frequency of occurrence and IRI (index of relative importance), every month, size class, year and area. The most important food of masu salmon was found to be juvenile fish of sand lances, Ammodytes personatus and other species independently of season and size. Larger plankton as Themisto japonica and Thysanoessa longipes were also major contributors to food in April and May. The higher dependence as food on T. japonica was recognized in the fish of larger size or those caught in the open bay or around islands as the water of open sea. Our results suggested that the masu salmon running into the sea grow up in estuary by feeding mainly juvenile fish to migrate northward, shifting their main food to large plankton.
日本水産増殖学会の論文