Abstract
The present experimental trial was conducted to determine the optimal dietary lipid requirement of juveniles of Pangasianodon hypophthalmus (Sauvage, 1878) commonly referred to as the striped catfish using completely randomized design (CRD). Purified diets with five different dietary lipid levels (3, 6, 9, 12 and 15%; fish oil/sunflower oil (1:1) were used to feed triplicate groups of Pangasius with initial mean weight of 13.54–14.12 g twice a day for 8 weeks. The highest weight gain (P < 0.05) was observed in fish fed with 9 and 12% lipid diets, followed by diet with 6% lipid, then by 15% lipid diet, and the lowest weight gain was observed in fish fed with 3% lipid. Other parameters such as specific growth rate (SGR), feed efficiency (FE) and protein efficiency ratio (PER) showed the same trend of weight gain. The hepatosomatic index (HSI), viscerosomatic index (VSI) and intraperitoneal fat (IPF) values increased with the increase of dietary lipid level. The feed conversion ratio (FCR) (P < 0.05) showed significant effects (P < 0.05) with variations in dietary lipid levels. The minimum FCR (1.95) was observed at 9% lipid inclusion-fed fishes and maximum FCR (3.53) was noticed at 3% lipid inclusion fed fishes. Higher and lower digestive enzyme activities were respectively observed in 9 and 15% lipid diets. The muscle fatty acid profile also varied with different dietary lipid levels. The higher level of ω-3, ω-6 fatty acid contents was recorded in the muscle of fish fed with 9% lipid diet, and lower level of fatty acid content was recorded in fish fed with 3% lipid diet. However, using second-order polynomial regression analysis, the optimal dietary lipid requirement of P. hypophthalmus juveniles was found to be 10.1%.



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Acknowledgements
Authors thank Dr. W. S. Lakra, Ex-Director & Vice-Chancellor, ICAR-CIFE for permitting us to do the research work in this esteemed institution. We also would like to thank Dr. G. Venkateswarlu, Ex-Dean (Academics), CIFE, for providing all the facilities needed for the successful completion of the research work. Authors also acknowledge Mary J. Nickum for English editing of the manuscript.
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Sivaramakrishnan, T., Sahu, N.P., Jain, K.K. et al. Optimum dietary lipid requirement of Pangasianodon hypophthalmus juveniles in relation to growth, fatty acid profile, body indices and digestive enzyme activity. Aquacult Int 25, 941–954 (2017). https://doi.org/10.1007/s10499-016-0090-1
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DOI: https://doi.org/10.1007/s10499-016-0090-1


