Biological Sciences, Vol. 2, Issue 1, Feb  2018, Pages 1-8; DOI: 10.31058/ 10.31058/

Optimum Crude Protein Requirement of the Fingerlings Nile Tilapia (Oreochromis niloticus)

, Vol. 2, Issue 1, Feb  2018, Pages 1-8.

DOI: 10.31058/

Abdelbaset Nasr Sayed 1*

1 Department of Animal Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt

Received: 4 December 2017; Accepted: 25 January 2018; Published: 9 March 2018

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Fingerlings of Nile Tilapia (Oreochromis niloticus) were fed four isocaloric diets with different crude protein levels to determine the optimum protein requirement of the species. Eighty of apparently healthy tilapia (Oreochromis niloticus) fish, of average weight 10 g were divided into four groups, each of 20 fish. Four experimental diets were formulated with four levels of dietary protein 27, 30, 33 and 36% and constant digestible energy, 3000 kcal/kg diet. Significant differences (P<0.05) were recorded for the growth indices, weight gain and feed conversion and the highest values obtained for the fingerlings fed the 33% crude protein diet. Crude protein, fat and ash contents of tilapias body were not significantly different among the fish fed the diets containing different protein levels. Protein retention, protein in gain and protein efficiency ratio of the fish fed diet containing 33% dietary protein were significantly (P<0.05) higher than other groups. It is therefore, concluded that 33% crude protein is optimal requirement in the diet of fingerlings Nile Tilapia (Oreochromis niloticus) with digestible energy 3000 kcal/kg diet.


Crude Protein, Growth Performance, Feed Conversion, Body Composition, Protein Utilization, Protein Efficiency Ratio, Nile Tilapia


© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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