Effects of Dietary Type on Nutritional Components in Whole Fish and Muscle,Body Color and Muscle Color in Dai-Ju Race Large Yellow Croaker (Pseudosciaena crocea)
Dai-ju race large yellow croaker( Pseudosciaena crocea) is regarded as a high-quality large yellow croaker colony in China. The w hole fish and muscle nutritional components,body color and muscle color of farmed large yellow croaker w ere partly decided by the quality of diet,and those indices w ere the important indices to measure the quality of Dai-ju race large yellow croaker. Thus,this study aimed to assay the w hole fish and muscle nutritional components,body color and muscle color of Dai-ju race large yellow croaker,and the effects of formulated feed and trash fish on quality of Dai-ju race large yellow croaker w ere evaluated. Tw o groups of fish w ere used. One fed trash fish and one fed formulated feed for 22 months. After sampling,the indices of w hole body and muscle nutritional components [including the contents of dry matter( DM),crude protein( CP),ether extract( EE),ash and amino acids]and the indices of body color and muscle color( including L,a and b values) w ere measured. The results show ed as follow s: compared w ith fish fed trash fish,fish fed formulated feed significantly decreased the EE content in w hole fish( P0.05),but significantly increased the contents of EE,leucine( Leu),lysine( Lys),glutamic acid( Glu),total essential amino acids,total delicious amino acids and total amino acids in muscle( P0.05). The body color and muscle color w ere not significantly affected by the type of diet( P0.05). Besides,the body color in different positions of large yellow croaker had a significant difference( P0.05),and the color of abdomen w as more bright w ith red and yellow than that of back. In conclusion,Dai-ju race large yellow croaker fed formulated feed exhibit a higher nutrient quality in the muscle than those fed trash fish.