支笏湖沿岸域におけるヒメマス幼魚(Oncorhynchus nerka)の食性について

概要

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In order to clarify the foraging ecology of juvenile kokanee salmon (Oncorhynchus nerka), we analysis the stomach contents of 6 juvenile salmons, which were corrected during the period from 27 June to 27 July 2006 at the littoral zone of Lake Shikotsu in Hokkaido Japan. The five fish in June sampling, fed primarily on one species of aquatic insect of Empididae. However, a fish in July sampling, fed on two species of zooplanktons (Chydorus shaericus and Cyclops sp.), larvae and adult of aquatic insects (Chironomidae), and several species of terrestrial insects (Diptera, Arachnida and so on). This result suggested that the food selection of juvenile kokanee salmon was high diverse in littoral zone of lake. In conclusion, we demonstrated that the littoral zone of lake would promote different types of feeding habitat for juvenile kokanee salmon from that of pelagic zone.
北海道東海大学の論文