Abstract:

The nutritional composition of the muscle of male and female Phoxinus lagowskii Dybowski was analyzed. The
results showed that the contents of crude protein in the fresh muscle of female and male Phoxinus lagowskii Dybowski were
19.45% and 18.95%, crude fat were 3.69% and 2.97%, moisture were 75.73% and 76.93%, ash were 1.43% and 1.37%,
respectively. There were no significant differences between both sexes (P ＞ 0.05). The total content of amino acids (TAA),
essential amino acids and delicious amino acids (DAA) of female Phoxinus lagowskii Dybowski was significantly higher
than that of male Phoxinus lagowskii Dybowski (P ＜ 0.05). There was no significant difference in the contents of Cys, Phe,
Trp or His, while a significant difference in the content of 14 other amino acids was observed. The constitutional rate of the
essential amino acids accorded with the FAO/WHO standard. The contents of Lys and Leu were higher. According to nutrition
evaluation in amino acids score (AAS), the first limiting amino acid was Trp and the second limiting amino acid was Val,
whereas the first limiting amino acid was Trp and the second limiting amino acid was Met + Cys in chemical score (CS). The
essential amino acid (EAAI) indexes of female and male Phoxinus lagowskii Dybowski were 61.97 and 54.51, respectively. In
comparison with other economic fishes, Phoxinus lagowskii Dybowski could be regarded as a source of high-quality protein
and amino acids, and the nutritional value of female was better than that of male by comparative analysis.

Key words: Phoxinus lagowskii Dybowski, female and male, muscle, nutritional compon