동해 중부 연안에 출현하는 강도다리의 식성

Abstract

Feeding habits of Platichthys stellatus were studied based on 184 specimens collected in the middle East Sea, Korea from March 2011 to February 2012. The size of Platichthys stellatus ranged from 16.5 to 48.5 cm in total length (TL). Platichthys stellatus was a bottom feeding carnivore which consumed mainly Mysidacea, Pisces, Gammaridea, Ophiuroidea. Its diet also included small quantites of Bivalvia, Anomura and Polychaeta. It showed ontogenetic changes in feeding habits. Although Bivalvia and Pisces were eaten predominantly for all size groups. But the proportion of Bivalvia to total stomach contents was small percentage. The proportion of pisces to total stomach contents increased with increasing fish size. The proportion of Mysidacea to total stomach contents decreased with increasing fish size. The relative proportion of the major stomach contents changed with season. The consumption of Anomura was higher in spring. The consumption of Ophiuroidea was higher in summer and autumn. Platichthys stellatus fed various prey organisms in summer. The consumption of pisces was higher in winter. The diet overlap index between size groups was from 0 to 0.49. The diet breadth index decreased with growing fish size. The seasonal diet breadth index was higher in summer.