Seasonal bottom-trawl surveys were conducted in Haizhou Bay, China from March to December 2011. A total of 516 Conger myriaster stomach samples were analyzed to study their feeding ecology, including diet composi- tion, feeding type, feeding intensity, trophic niche, and trophic level. The results show that the prey items of C. myri- aster included more than 40 species, and fish, decapods, and cephalopods were the dominant prey groups. Syngnathus acus, Chaeturichthys stigmatias, Alpheus distinguendus, and Loligo sp. were the major prey species of C. myriaster. Benthic animals were the dominant C. myriaster prey type, followed by swimming animals. The diet composition of C. myriaster had clear seasonal and length variations, and fish and shrimp were the major prey groups throughout all four seasons, whereas cephalopods were the most important prey during autumn. Loligo sp. were the dominant prey group of the C. myriaster with anal length < 70 mm, whereas Callionymus beniteguri and A. distinguendus were the dominant prey groups of the 70–99 mm C. myriaster. Loligo sp., Syngnathus acus, and A. distinguendus were the dominant prey groups of the C. myriaster > 99 mm. Percent of empty stomach and mean stomach fullness index of C. myriaster varied seasonally. The lowest and highest percent of empty stomach occurred in summer and spring, respectively. The mean stomach fullness index was lower in spring and higher in autumn. The C. myriaster trophic level was 4.17, indicating that it was in a high trophic position in the Haizhou Bay food web. The feeding ecology of C. myriaster varied season- ally and ontogenetically, which was mainly due to variations of dominant prey species. These results will help with as- sessments of prey abundance and species changes and provide basic information for building a food web and under- standing the trophic dynamics in the Haizhou Bay ecosystem.