This study evaluated the effects of replacing fishmeal with black soldier fly（BSF）larvae meal on the growth performance，physiological metabolism，and muscle quality of hybrid mandarin fish （Siniperca chuatsi ♀ × Siniperca scherzeri ♂）. Juvenile fish with an initial body weight of（11.43±0.54）g were used as experimental subjects，and five isonitrogenous and isolipidic diets were formulated， incorporating BSF larvae meal as a replacement for fishmeal at levels of 0%，10%，20%，30%，and 40%. The results showed that：（1）Replacing 20% of fishmeal with BSF larvae meal significantly enhanced weight gain rate（WGR）and specific growth rate（SGR），whereas growth performance declined markedly when the replacement level reached 30% or higher（P<0.05）.（2）Analysis of tissue texture and proximate composition showed that crude protein and lipid contents in the hepatopancreas of the 20%-40% replacement groups were significantly lower than those in the control group（0% replacement）. Moreover， gumminess，resilience，and chewiness of muscle were significantly reduced in the 40% replacement group compared to the control group（P<0.05）.（3）Serum biochemical parameters indicated that triglyceride and total cholesterol levels decreased significantly with increasing fishmeal replacement，while albumin levels increased significantly（P<0.05）.（4）Serum malondialdehyde（MDA）levels were lowest in the 30% replacement group，while lysozyme（LZM）activity peaked at the 20% replacement group. In conclusion， replacing up to 20% of fishmeal with BSF larvae meal significantly improved growth performance and enhanced the immune-antioxidant capacity of hybrid mandarin fish. However，higher replacement levels adversely impacted growth performance and muscle quality. Therefore，the optimal replacement level of BSF larvae meal for fishmeal in hybrid mandarin fish diets is approximately 20%.