IngentaConnect Dietary arginine requirement of fingerling hybrid Clarias (Claria...

Authors: Singh, Shalini¹; Khan, Mukhtar A¹

Source: Aquaculture Research, Volume 38, Number 1, January 2007 , pp. 17-25(9)

Abstract:

The dietary arginine requirement of fingerling hybrid Clarias (Clarias gariepinus×Clarias macrocephalus) (4.2±0.03 cm, 0.56±0.04 g) was determined by feeding six isonitrogenous (400 g kg⁻¹ crude protein) and isocaloric (17.9 kJ g⁻¹) amino acid test diets containing casein, gelatin andl-crystalline amino acids with graded levels of arginine (10.0, 12.5, 15.0, 17.5, 20.0 and 22.5 g kg⁻¹) for 4 weeks to triplicate groups. Diets were fed twice a day at 09:00 and 16:00 hours at 8% body weight day⁻¹. Maximum weight gain (523%), best feed conversion ratio (FCR, 1.41), protein efficiency ratio (1.78) and specific growth rate (6.53%) were recorded in fish fed the diet containing arginine at 20.0gkg⁻¹ of the diet. Second-degree polynomial regression analysis of live weight gain and FCR values indicated the dietary arginine requirement at 17.8 and 20.0 g kg⁻¹ of dry diet respectively. Significantly higher carcass protein and protein deposition values were recorded at the requirement level (20.0 g kg⁻¹). Higher fat and lower moisture values were obtained in carcass of fish fed the diet with 15.0g kg⁻¹ arginine. The maximum carcass ash value was noticed in the fish fed at 20.0 g kg⁻¹ dietary arginine. We recommend that the diet for hybrid Clarias (C. gariepinus×C. macrocephalus) should contain arginine in the range of 17.8-20.0 g kg⁻¹ of the dry diet, corresponding to 44.5 and 50 g kg⁻¹ of dietary protein respectively.

Keywords: dietary arginine requirement; hybrid Clarias (Clarias gariepinus×Clarias macrocephalus); nutrient requirements

Document Type: Research article

DOI: 10.1111/j.1365-2109.2006.01618.x

Affiliations: 1: Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh 202002, UP, India

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Dietary arginine requirement of fingerling hybrid Clarias (Clarias gariepinus×Clarias macrocephalus)