Analysis on nutritive composition of muscle in wild and cultured Culter alburnus populations in Xingkai Lake at different ages

Abstract

We compared the muscle constituents and quality of age 2,4,and 6 wild and cultured Culter alburnus populations in Xingkai Lake,Heilongjiang Province.There was no significant difference in muscle components between wild and cultured populations of age 2 C.alburnus(P0.05).However,the moisture and crude protein contents were significantly higher in the wild population than in the cultured population.Conversely,the crude fat content was significantly lower in wild population than in the cultured population(P0.05) for both age 2 and age 4 fish.Compared with the common farmed fish,the Ca and P content of wild C.alburnus in Xingkai Lake was high and there was no difference in amino adid composition in wild and cultured populations.Of the amino acids,glycine was the most common,followed by glutamate and lysine.The total amino acid(TAA),essential amino acid(EAA),and delicious amino acid contents were significantly higher in the wild population than in the cultured population for age 4 and 6 individuals(P0.05).Our results suggest that the protein content is high in both the wild and cultured populations of C.alburnus in Xingkai Lake and that these fish have high nutritional and edible value.Compared with the cultured population,the nutritional value and taste of the meat was superior in the wild population,and this advantage increased with the age of the fish.Our data provide a basis for evaluating the nutri-tional value of C.alburnus and for developing manufactured feed for cultured fish.Based on our observations,artificial feeds for C.alburnus in Xingkai Lake should include methionine and cystine to improve the nutritional value whereas glycine and glutamic acid should be added to improve the flavor of cultured fish.