Yudong Jiang

Effects of different dietary lipid sources on growth performance and tissue fatty acid composition of juvenile swimming crab Portunus trituberculatus

This study was conducted to evaluate the effects of dietary lipid sources on the growth performance and fatty acid composition of the swimming crab, Portunus trituberculatus. Four isonitrogenous and isoenergetic experimental diets were formulated to contain four separate lipid sources, including fish, soybean, rapeseed, and linseed oils (FO, SO, RO, and LO, respectively). With three replicates of 18 crabs each for each diet, crabs (initial body weight, 17.00±0.09 g) were fed twice daily for 8 weeks. There were no significant differences among these groups in terms of weight gain, specific growth rate, and hepatosomatic index. However, the RO groups’ survival rate was significantly lower than FO groups. The feed conversion and protein efficiency ratios of RO groups were poorer than other groups. The proximate compositions of whole body and hepatopancreas were significantly affected by these dietary treatments. Tissue fatty acid composition mainly reflected dietary fatty acid compositions. Crabs fed FO diets exhibited significantly higher arachidonic, eicosapentaenoic, and docosahexaenoic acid contents in muscle and hepatopancreas compared with VO crabs. Linoleic, oleic, and linolenic acids in muscle and hepatopancreas were the highest in the SO, RO, and LO groups, respectively. The present study suggested that SO and LO could substitute for FO in fishmeal-based diets for swimming crabs, without affecting growth performance and survival.

Effects of Dietary Carbohydrate-to-Lipid Ratios on Growth and Body Composition of Orange-spotted Grouper Epinephelus coioides

AbstractGrowth performance of juvenile Orange-spotted Grouper Epinephelus coioides fed isonitrogenous (45% crude protein) and isoenergetic diets with varying carbohydrate-to-lipid ratios (0 to 10.9) were evaluated. Triplicate groups of 18 fish (initial mean individual body weight, 16.4 g/) were fed to satiety for 8 weeks. At the termination of this trial, significant differences (P < 0.05) were found on the growth performance. Weight gain and specific growth rate values increased with decreasing dietary carbohydrate-to-lipid ratios. The highest feed conversion ratio value and the lowest protein efficiency ratio value were observed in fish fed the 10.9 carbohydrate-to-lipid ratio diet. Besides, fish fed the 10.9 carbohydrate-to-lipid ratio exhibited the lowest nitrogen retention and energy retention values. With the diet carbohydrate-to-lipid ratios decreasing, hepatosomatic index values were reduced significantly (P < 0.001), while the intraperitoneal fat index values showed an inverse trend. Whole-body p...