The muscle proximate composition ,activities of digestive and immune enzymes were analyzed and compared in Mozambican tiger shrimp Penaeus monodon with body weight of (3 .36 ± 0 .38) g ,(8 .88 ± 0 .48) g and (14 .92 ± 0 .53 ) g . The results showed that the muscular moisture was found to be significantly decreased as the shrimp grew (P<0 .05) .However ,the muscular crude protein and crude lipid contents increased with increase in body weight . The tissue protease activities were arranged as :hepatopancreas>intestine> stomach ;the lipase activities as :hepatopancreas≈ intestine> stomach ;and the amylase activities as :intestine > hepatopancreas> stomach .The digestive enzymes activities were varied with the body weight ,the hepatopancreas and intestine being recognized as the primary digestive tissues . The activities of alkaline phosphatase and acid phosphatase were found to be decreased in hepatopancreas with the increasing body weight (P<0 .05) .The minimal activity of catalase was observed in mid-sized shrimp while the minimal superoxide dismutase activities were found in the small shrimp .%为探究莫桑比克草虾的肌肉营养成分、消化器官主要消化酶及肝胰腺免疫酶活性，分析了3种规格[体质量分别为（3．36±0．38） g、（8．88±0．48） g和（14．92±0．53） g ]的莫桑比克草虾。分析结果表明，随着个体生长，莫桑比克草虾肌肉水分含量显著下降（P＜0．05）；但粗蛋白和粗脂肪含量上升（P＜0．05）。蛋白酶活性：肝胰腺＞肠＞胃；脂肪酶活力：肝胰腺≈肠＞胃；淀粉酶活性：肠＞肝胰腺＞胃，表明肝胰腺和肠是莫桑比克草虾主要消化器官，且随着虾个体生长，消化酶活性提高。但莫桑比克草虾肝胰腺碱性磷酸酶和酸性磷酸酶活性均随着规格的增加而显著下降（P＜0．05）。中规格草虾过氧化氢酶活性最低，其它两组间无显著差异。超氧化物歧化酶活性随着草虾体质量增加而增强，但中规格和大规格组之间该酶活性差异不显著（P＞0．05）。
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