西海沿岸 潮間帶에 棲息하는 날개망둑 Favonigobius gymnauchen 의 食性

Feeding Habits of the Favonigobius gymnauchen from the Coast Intertidal Zone in the West Coast of Korea

To know the food chain of an intertidal community, feeding habits of Fauonigobius gymnauchen were studied by analyzing stomach contents. F. gymnauchen were monthly collected in the intertidal zone of Doksan-ri, Yoongchon-myon, Poryong from July 1993 to June 1994. Ratio of stomach contents to weight of F. gymnauchen was 1.22%, and fullness of stomach showed a similar value to ratio of stomach contents to weight. Fullness of stomach was increased twice a day in the morning and the afternoon. The most important food item was copepods amounting to 68% of the total stomach contents. Of these, Paraca!anus parous was most abundant in spring, Corycaeus ajfinis in summer, Ca!anus sinicus in autumn, and Acaryia sp. in winter. Degree of overlapping for the food items between seasons was below 0.6. There were little differences in feeding habits among the size groups. For all size groups of F. gymnauchen, the occurrence rates of copepods, decapods, molluscs and cirriped larvae were high. As the fish grows, those of amphipods, polychaete larvae, isopods, cumaceans and stomatopods increased gradually. The importance index of the major food items was in the order of Corycaeus ajfinis, Calanus sinicus, and Paracalanus parous.