Analysis and evaluation on nutritional composition of Culter dabryi and Culter mongolicus in Poyang Lake
The study focuses on the wild Culter dabryi and Culter mongolicus from the waters at the mouth of Poyang Lake,employing conventional biochemical analysis methods to test the conventional nutritional components,amino acids,fatty acids,and minerals in the muscle tissues of both species of Culter fish,and to evaluate their nutritional value.The results show that the crude protein content of Culter mongolicus is higher than that of Culter dabryi,while the crude fat content is significantly lower than that of Culter dabryi(P＜0.05).Both Culter dabryi and Culter mongolicus muscles contain the eight essential amino acids required by the human body,with the ratio of essential amino acids to total amino acids exceeding 40％,and the ratio of essential amino acids to non-essential amino acids exceeding 60％,all in line with the ideal pattern recommended by FAO/WHO.Both species of Culter fish contain six types of umami amino acids,with glutamic acid being the most abundant.The muscles of Culter dabryi and Culter mongolicus contain twelve unsaturated fatty acids,with a proportion exceeding 60％,and the combined content of EPA+DHA is 12.13％and 15.65％,respectively.The muscles of Culter mongolicus and Culter dabryi are rich in multiple mineral elements such as zinc,selenium,and calcium,with all mineral contents in Culter mongolicus being significantly higher than in Culter dabryi(P＜0.05).The study indicates that both Culter dabryi and Culter mongolicus from the Poyang Lake area are high in protein and low in fat,with high nutritional value and great potential for development.
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