Abstract: The muscle of Monodonta labio living in the Dongji sea area of Zhejiang province was subjected to chemical composition analysis and nutritional evaluation. The contents of water, crude protein, crude fat, crude ash and carbohydrates in the muscle of M. labio were 76.74%, 17.32%, 0.99%, 2.92% and 1.57%, respectively. Eighteen common amino acids were detected in the muscle of M. labio. Glutamic acid revealed the highest content (2.035%), and total essential amino acids and non-essential amino acids were 35.20% and 82.51% on the basis of total amino acids, respectively. The ratio of branch-chain amino acids to aromatic amino acids was 2.161, which was close to the normal value in the human body. Delicious amino acids were 47.36% on the basis of total amino acids. According to nutritional evaluation using amino acid score, the first limiting amino acid was tryptophan and the essential amino acid index (EAAI) was 87.47. Fourteen fatty acids were detected in the muscle of M. labio. The relative contents of saturated fatty acids (SFA), monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) were 38.935%, 26.395% and 34.670% in total fatty acids, respectively.

Key words: Monodonta labio, nutritional composition, evaluation