The biochemical composition in muscle of Canadian sergeant fish, Rachycentron canadum(Linnaeus) were reported. The contents of protein and fat of themuscle of Canadian sergeant fish were 21.2% and 5.5% respectively. The ratios of essential amino acids and deicious amino acids to total amino acids were 50.39% and 44.92%. The ratio of unsaturated fatty acids to total fatty acids was 65.2%,and the ratios of EPA and DHA to total fatty acids were 4.5% and 12%. The result indicatde that the ratio of essential amino acid and deicious amino acid to total amino acid in muscle of Canadian sergeant fish were the highest when the canadian sergeant fish weigh about 3.4 kg. The nutritive value and deicious extent of canadian sergeant fish, Rachyentron canadum(Linnaers) were better than other fish as sea group in cultured net-cage.%对海鲡肌肉的营养成分含量及氨基酸、脂肪酸、无机质组成进行了研究，结果表明，海鲡的蛋白质和脂肪含量分别为21.5%和5.5%，必需氨基酸和鲜味氨基酸分别占氨基酸总量的40.9%和37.8%，不饱和脂肪酸占脂肪酸总量的65.2%，其中C20:5和C22:6的含量分别为4.5%和12.0%，3.4 kg阶段的养殖海鲡肌肉的必需氨基酸和呈味氨基酸的比率最高。
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