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The metabolic rate of Japanese sea bass, Lateolabrax japonicus (C & V), was estimated in laboratory at temperature 25.2±0.5℃. The fresh weight of the fish was 4.64-52.28 g (average of 17.81±0.33 g). The routine metabolism was related to body weight by the exponential equation: Rr=14.966W0.74 (r=0.934). The rate of feeding metabolism increased linearly with food consumption. Feeding metabolic rate was 1.8-2.4 times the routine metabolic rate.