a benthic dwelling fish distributing throughout the Indian Ocean and Western Pacific,plays an important role in marine ecosystems. Despite its abundance and importance to fisheries, little is known about the biology of this species. We evaluated ontogenetic and diet variation in the feeding ecology of in the areas adjacent to the Changjiang River Estuary. We collected a total of 450 individuals ranging in size from 64 standard length (SL) during monthly surveys in the south Yellow Sea and the north East China Sea between September 2009 and August 2010. Based on stomach content analysis, was a generalist. We identified 39 prey species, of which other fish were the most abundant, accounting for 84.13% of the total food by weight. At the species level, the primary prey were Apogonichthys lineatus,The feeding intensity, as indicated by the percentage of empty stomachs and the mean stomach fullness index, varied significantly among seasons. Feeding activity was the highest in autumn and lowest in winter. There were significant seasonal differences in the diet of Decapods were more important in spring, whereas fish were more important during other seasons. Both the feeding intensity and diet composition varied significantly among different size classes. There were two abrupt changes in diet composition at about 100 and 250 mm SL, the latter characterized by a switch from euryphagy to stenophagy. The trophic level of was 3.80, suggesting that this species was a high level predator within the food web in the Yellow Sea and East China Sea.