To study the position and role of Miichthys miiuy in the food web of Zhoushan fishing ground ecosystem, we collected a total of 727 Miichthys miiuy samples monthly from August 2021 to June 2023 on Zhoushan fishing ground, and examined the feeding habits based on both stomach content analysis method and carbon and nitrogen stable isotope techniques. The results indicated that the main prey species of Miichthys miiuy in Zhoushan fishing ground were Pisces, Decapoda, Stomatopoda, Lamellibranchia, Cephalopoda, and Brachyura. Harpodon nehereus, Collichthys lucidus, Coilia mystus, and Amblychaeturichthys hexanema were the dominant prey species. The δ¹³C of Miichthys miiuy ranged from –19.09% to –13.04‰, with an average value of –(16.74±1.03)‰, which was negatively correlated with body length (P＜0.01). The value of δ¹⁵N was between 10.72% and 15.96‰, with an average value of (12.44±1.36)‰, which was significantly positively correlated with body length (P＜0.01). The trophic level of Miichthys miiuy on the Zhoushan fishing ground, calculated from δ¹⁵N values, ranged from 3.93 to 4.92, with an average trophic level of 4.30±0.39, and the trophic level was significantly positively correlated with body length (P＜0.01). The stable isotope analysis revealed that Stomatopoda made the highest contribution to Miichthys miiuy trophic level (20.6%), followed by Cephalopoda (18.3%), Decapoda (16.4%), and Lamellibranchia (13.7%). Miichthys miiuy fed throughout the year, and feeding intensity varied significantly with season and body length. Seasonally, the stomach fullness index was the highest in winter and the lowest in autumn; in terms of body length, the stomach fullness index was low for large individuals and high for small individuals. The empty stomach rate was the highest in autumn and the lowest in winter. The empty stomach rate did not significantly vary with body length. These results will help to understand the feeding habits of Miichthys miiuy on Zhoushan fishing ground and provide basic information and scientific basis for the study of food web dynamics and trophic dynamics.