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Dietary amino acid l-tryptophan requirement of fingerling Indian catfish, Heteropneustes fossilis (Bloch), estimated by growth and haemato-biochemical parameters

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Abstract

An 8-week feeding trial was conducted to determine the dietary tryptophan requirement of fingerling Indian catfish, Heteropneustes fossilis (6.10 ± 1.15 cm, 4.44 ± 0.50 g). Six isonitrogenous (40 g 100 g−1) and isoenergetic (17.90 kJ g−1) amino acid test diets were formulated with gradation of 0.1 g 100 g−1 containing graded levels of l-tryptophan (0.04–0.54 g 100 g−1, dry diet). Fish were stocked in triplicate groups, in 75-L circular trough with flow-through system and fed experimental diets at 4% BW/day twice daily. Maximum live weight gain (258%), best feed conversion ratio (FCR) (1.54) and protein efficiency ratio (PER) (1.62) were obtained in fish fed diet containing 0.34 g 100 g−1 tryptophan. However, quadratic regression analysis of weight gain, FCR, PER and body protein deposition (BPD) data indicated requirements for dietary tryptophan at 0.37, 0.33, 0.32 and 0.33 g 100 g−1 of dry diet, respectively. Significantly (P < 0.05) higher body protein, minimum moisture and intermediate fat contents were recorded at 0.34 g 100 g−1 dietary tryptophan diet. Ash content was not significantly different (P > 0.05) among treatments except for diets 0.04 and 0.14 g 100 g−1. Excellent somatic and haematological indices values were obtained at the requirement level. Based on above results, it is recommended that the diet for H. fossilis should contain tryptophan at 0.32 g 100 g−1, dry diet, corresponding to 0.80 g 100 g−1 dietary protein for optimum growth and efficient feed utilization.

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Acknowledgments

The author is grateful to the Head, Department of Zoology, University of Kashmir, Hazratbal, Srinagar, India, for providing the laboratory facilities and gratefully acknowledge the financial support for this project from the Department of Science and Technology (DST), Govt of India, New Delhi, in the form of DST-FAST Track Young Scientist Project (No. SR-FT/L-57/2006) on Fish Nutrition and Diet development. Thanks are also due to Mr. Mufti Buhran, University Chief Executive Engineer, for helping the construction of new Feed Technology Laboratory (Wet-Lab.) in the Department of Zoology and Prof. S. Fayyaz Ahmad, Registrar, University of Kashmir, for their keen interest towards the smooth implementation of the project.

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Ahmed, I. Dietary amino acid l-tryptophan requirement of fingerling Indian catfish, Heteropneustes fossilis (Bloch), estimated by growth and haemato-biochemical parameters. Fish Physiol Biochem 38, 1195–1209 (2012). https://doi.org/10.1007/s10695-012-9609-1

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