Abstract:To explore the influence of Chlorella growth factors (CGF) added feed on the prawn growth performance, and body nutrient composition, the juvenile Pacific white shrimp Litopenaeus vannamei were fed diets containing 0%, 0.5%, 5.0%, 10.0%, and 15.0% of CGF, respectively. After 45 d feeding trial, the growth performance, and body and nutrient composition were measured. The results showed that dietary supplementation of CGF led to improve the survival rate, weight gain rate and specific growth rate of the shrimp, and to reduce the feed conversion ratio. The supplementation of CGF in the diet resulted in decrease in the water content of the shrimp, increase in the crude protein content of the shrimp, and decrease in the proportions of water, ether extract and ash. Among all experiment groups, the water, ether extract and ash proportion level in 1% group were all at the lowest, with the maximal crude protein. Dietary supplementation of 10.0%—15.0% CGF significantly led to increase in the contents of total fatty acids, saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids. Dietary CGF supplementation increased the proportion of polyunsaturated fatty acids while decreased the proportion of saturated fatty acids and monounsaturated fatty acids, and the proportion of saturated fatty acids in 1.0% group was the lowest. Dietary supplementation with different proportions of CGF (except 10.0% treatment group) significantly increased the total amino acid content and essential amino acid content in muscle (P<0.05). Dietary CGF supplementation resulted in improvement of the survival rate and growth performance of Pacific white shrimp, decreas in the proportion of water, fat and ash, and increase in the proportion of protein, with the optimal adding proportion of 1.0%.
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