Abstract:

In order to understand the nutritional value of Odontobutis potamophila muscle, the nutritional composition and
quality of in the muscle of ecologically cultured O. potamophila (2 years old) in winter were analyzed and evaluated by
biochemical analysis. The results showed that the moisture, crude protein, crude fat, and crude ash contents in fresh muscles
of O. potamophila in winter were 78.08%, 18.26%, 1.11%, and 1.30%, respectively. Glutamic acid, aspartic acid and lysine
revealed the most abundant among 18 kinds of amino acids detected in muscles. The contents of total amino acid (TAA),
total essential amino acid (EAA), total half-essential amino acid (HEAA), and total delicious amino acid (DAA) in fresh
muscles were 19.47%, 7.74%, 1.80%, and 7.09%, respectively. The EAA/TAA, EAA/NEAA, and DAA/TAA ratios were
39.75%, 77.92%, and 36.42%, respectively. According to nutritional evaluation using amino acids score (AAS) and chemical
score (CS), the first limiting amino acid was Trp, and the second limiting amino acid was Val. The essential amino acid
index (EAAI) and the ratio of branched chain amino acid to aromatic amino acid (F value) were 74.86 and 2.15, respectively.
Totally 6 saturated fatty acids (SFA), 4 mono-unsaturated fatty acids (MUFA), and 10 poly-unsaturated fatty acids (PUFA) were
found in the dry muscle. The ΣSFA, ΣMUFA, ΣPUFA, Σn-3 PUFA, EPA+DHA, and Σn-6 PUFA were 31.83%, 20.91%,
47.27%, 30.60%, 23.58%, and 15.56%, respectively. The ΣSFA/ΣUFA and Σn-3 PUFA/Σn-6 PUFA ratios were 0.47% and
1.97%, respectively. Therefore, O. potamophila is a kind of high nutritional value, delicious, and high quality fish, and the muscle
has some health benefits. The muscle of O. potamophila in winter has higher contents of crude protein and crude fat, and better
amino acid and fatty acid compositionsso that its nutritional value is higher than that in the breeding season.

Key words: Odontobutis potamophila, muscle, nutritional composition, amino acid, fatty acid