The larval red sea bream produced in Hiroshima-ken Fish Farming Center were examined histologically and biochemically in reference to energy accumulation. 1) PAS-positive substances appeared in liver at the 6th day after hatching (total length 2.3 mm). Glycogen initiated to be accumulated in liver at 31st day (8.0 mm), but lipid deposition was not found in the liver at the 41st day (12.7 mm). The formation of intraperitoneal fat body was found at the 68th day (30 mm) after hatching. 2) Qualitative and Quantitative measurements of lipid in muscle, liver, and intraperitoneal fat body exhibited that accumulation of triglycerides became constant at the stage of 45 mm in body length. The stage would correspond to accomplishment of lipid storage which could be mobilized as energy sources. With the progress of growth, fatty acids such as C16 and C18:1 increased in muscle triglycerides.