Abstract：After the implementation of the Yangtze River ten-year fishing ban, the resource of the critically endangered species Ochetobius elongatus is gradually recovered. To elucidate the nutritional composition of its muscle, six individuals with body weight of (200±50) g were collected from the Xiangjiang River in 2024. The proximate nutritional composition and the contents of amino acids, fatty acids, and mineral elements in the muscle were determined. The results showed that there were 78.23 g/100 g of moisture, 17.33 g/100 g crude protein, and 1.23 g/100 g crude fat in the muscle of O. elongatus, with high contents of mineral elements such as calcium, phosphorus, and potassium and an energy value of 375.33 kJ/100 g. A total of 18 amino acids were detected, with a total content of 15.256 1 g/100 g, including an essential amino acid index (EAAI) of 97.64, ratios of essential amino acids to total amino acids (EAA/TAA) of 44.82% and to non-essential amino acids (EAA/NEAA) of 81.23%. A total of 15 fatty acids were found, with the docosahexaenoic acid and eicosapentaenoic acid (DHA+EPA) content of 0.147 6 g/100 g, a saturated fatty acids to monounsaturated fatty acids to polyunsaturated fatty acids (SFA∶MUFA∶PUFA) ratio of 1.00∶0.86∶1.14, and n-6/n-3 ratio of 0.40∶1.00 within PUFAs. In conclusion, O. elongatus had a well-balanced amino acid and fatty acid profile and was rich in minerals in the muscle as a high-quality lean protein source with promising potential for application in functional food development.
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2026, Vol. 45 
