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Effect of dietary lipid levels on growth performance, fatty acid profile and enzymatic activity of juvenile swimming crab, Portunus trituberculatus
Author(s) -
Han Tao,
Yang Min,
Li Xinyu,
Zheng Puqiang,
Wang Chunlin,
Wang Jiteng
Publication year - 2018
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.13726
Subject(s) - portunus trituberculatus , biology , juvenile , moulting , fatty acid , zoology , lipase , lipid metabolism , significant difference , food science , weight gain , polyunsaturated fatty acid , biochemistry , enzyme , fishery , body weight , medicine , endocrinology , botany , ecology , larva
The main objective of this investigation was to study the lipid requirements of the early juvenile (C1) swimming crab ( Portunus trituberculatus ) based on growth performance, survival, moulting and fatty acid profile. Four test diets were formulated with graded lipid levels (3.63%, 6.70%, 10.72% and 13.91%). Each diet was fed to 4 replicates of crabs (30 crabs per replicate initial weight (8.4 ± 0.1 mg). In this study, crabs fed diets with 13.91% lipid had significantly ( p < 0.05) higher survival than crabs fed with 3.63% lipid, but no significant ( p > 0.05) improvement of survival was observed when dietary lipid increase from 6.70% to 13.91%. Crabs fed diets with 10.72% and 13.91% lipid had significant higher weight gain( WG ) than crabs fed with 3.63% lipid. While crabs fed with diets containing 6.70%, 10.72% and 13.91% lipid showed no significant ( p > 0.05) difference in weight gain( WG ). Moreover, the lowest moulting number was observed in crabs fed diets with 3.63% lipid, but there was no significant difference ( p > 0.05) among other groups. The content of LC ‐ PUFA and DHA in the crabs fed diets with 3.63% lipid was significant ( p < 0.05) lower compared to other groups. But there was no significant ( p > 0.05) difference in EPA and ARA content among all groups. The activity of lipase increased as dietary lipid level increased (from 6.70% to 10.72%). However, beyond 10.72%, a significant ( p < 0.05) decreased in lipase activity was observed. The regression analysis of weight gain data indicated that crab fed diet containing 10.47% lipid level is considered as optimum lipid level for its maximum growth and moulting process.