한국 동해 남부 고리 주변해역에 출현하는 돛양태(Repomucenus lunatus)의 식성

Abstract

Abstract

The feeding habits of moon dragonet (Repomucenus lunatus) were studied based on 232 specimens collected from January to December 2006 in the coastal waters off Gori, Korea. The size of R. lunatus ranged from 4.7 to 14.0 cm in standard length (SL). Repomucenus lunatus was a bottom-feeding carnivore which consumed mainly amphipods and polychaetes. Its diet also included small quantities of shrimps, cumaceans. bivalvies, gastropods, crabs, copepods, euphausia, mysids, stomatopods, ostracods and sipunculides. It showed ontogenetic change in feeding habits. Although amphipods were eaten predominantly for the smallest size class, the proportion of amphipods decreased with increasing fish size. Instead, the proportions of polychaetes increased gradually with increasing fish size. The composition of stomach contents changed with season. The consumption of amphipods were higher in spring and winter. The feeding strategy graphical method revealed that R. lunatus is a specialized feeder. The mean number and weight of preys per stomach of larger size classes were higher than those of smaller size classes. The diet overlap index between size classes was more than 0.6 indicating high diet similarities.