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Effects of dietary DHA / EPA ratios on growth performance, survival and fatty acid composition of juvenile swimming crab ( P ortunus trituberculatus )
Author(s) -
Hu Shuixin,
Wang Jiteng,
Han Tao,
Li Xinyu,
Jiang Yudong,
Wang Chunlin
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12971
Subject(s) - portunus trituberculatus , biology , docosahexaenoic acid , eicosapentaenoic acid , zoology , juvenile , composition (language) , protein efficiency ratio , food science , fatty acid , weight gain , fishery , polyunsaturated fatty acid , body weight , biochemistry , ecology , endocrinology , linguistics , philosophy
Abstract This study was conducted to investigate the effects of dietary docosahexaenoic to eicosapentaenoic acid ( DHA / EPA ) ratios on growth performance, survival and fatty acid composition of juvenile swimming crab ( Portunus trituberculatus ). Four isonitrogenous and isoenergetic experimental diets were formulated to contain different DHA / EPA ratios (0.70, 0.84, 1.06 and 1.25). There were three replicates (15 crabs per replicate) for each diet treatment. The crabs were fed (about 6–8% body weight) twice daily for 8 weeks. A good growth performance and feed utilization were observed in swimming crabs fed the diets with DHA / EPA ratios of 0.70 and 0.84. Crabs fed diet with 0.70 DHA / EPA ratio showed a significantly higher weight gain ( WG ) compared with the crabs fed the diet with DHA / EPA ratio of 1.25 ( P < 0.05). The result of this study showed that the survival increased with decreasing the ratio of DHA / EPA . The DHA / EPA ratios in polar lipid from tissues were influenced by the dietary DHA / EPA ratios. Results of this study indicated that the growth performance and survival of juvenile swimming crab are correlated to the DHA / EPA ratio in the diets, and the best growth performance and survival were achieved with the ratios of 0.70–0.84.