EFFECT OF DIFFERENT LEVELS OF FISH AND VEGETABLE OIL ON GROWTH PERFORMANCE AND BODY COMPOSITION OF JUVENILES OF LABEO ROHITA.

Roopma Gandotra, Ritu Kumari*, Dalbir Singh Parihar and Monika Sharma

ABSTRACT

During the present investigation, juveniles of Labeo rohita (0.438±0.002g) were fed in triplicate with four isonitrogenous (40% protein) and iso-lipidic (6%) diets, @ 5% of body weight, for a period of 60 days. Diets B1-B4, supplemented with fish oil (FO) and vegetable oil (VO) at different proportions. Diet B1 (30%VO+ 70% FO), Diet B2 (50% FO+50% VO), Diet B3 (70% FO+30% VO), Diet B4 (100% FO). After 60 days of feeding a significant difference (p<0.001) was observed in weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR) and body lipid composition. The diet B2 shows the best result with 0.616±0.004 g WG, (0.304±0.033) SGR and (9.44±1.020) FCR and (10.22±1.102) FCE. However, there was insignificant difference (p> 0.001) in all the growth performance parameters between diet B4 and B2. Whereas, Diet B1 registered poorest performance i.e. (0.424±0.002) WG, (0.206± 0.023) SGR, (12.28±0.002) FCR and (8.19±0.083) FCE. The following trend emerges in term of weight gain, SGR, FCR and PER B2> B4> B3> B1. Body proximate composition revealed that the quality of dietary lipid significantly affected the body lipid level. The juvenile fed with diet B2 obtained a significant (p<0.001) higher body lipid content i.e 1.18, as compared with other diets i.e.B4, B3, B2 and B1, where it was 1.03, 1.04, 1.07 respectively. The present result thus revealed that vegetable oil could partially replace the fish oil up to 50% in supplemented diet, to enhance the growth of juveniles of Labeo rohita.

Keywords: Fish oil, Vegetable oil, Growth rate parameters, Body lipid composition, Labeo rohita.