Use of Soybean Meal as partial substitute of Fish Meal in the Diets of Rohu, Laabeo Rohita (Ham.) Fry

By : D. A. Jahan , M. Z. Ali , L. Hussain , M A. Islam

Page No: 21-31

Abstract
A 60-days feeding trial was conducted in a static indoor rearing system consisting 12 glass aquarium to investigate the utilization of soybean meal protein replacing fishmeal as dietary protein source for Labeo rohita fry (0.86 ± 0.03 g). Four iso-nitrogenous (30% protein) and iso-caloric (19 kJ/g GE) experimental diets were prepared to contain viz. diet 1 (100% fishmeal protein), diet 2 (75% fishmeal protein + 25% soybean meal protein), diet 3 (50% fishmeal protein + 50% soybean meal protein) and diet 4 (25% fishmeal protein + 75% soybean meal protein) were fed to triplicate groups of 10 fish (per aquaria). Fish were fed two times daily at the rate of 5% of their body weight during the entire experimental period. The feeding ration was adjusted every 10th day sampling of fish. Among the diets, the best (P < 0.05) growth rates, feed conversion ration (FCR) and protein efficiency ratio (PER) were evident in fish fed with diet 2 contained 75% soybean meal protein and 25% fish meal protein and no significant difference (P > 0.05) was observed between diets 1 and 3. Whole body compositions of fish were not significantly different (P > 0.05) among the treatments. The study reveals that considering the growth rates, FCR and PER, it can be suggested that fishmeal protein could be replaced up to 50% by soybean meal protein in the diet of L. rohita fry without supplementation of amino acids.

Authors :
D. A. Jahan and M. Z. Ali
Bangladesh Fisheries Research Institute (BFRI) Freshwater Station, Mymensingh-2201

L. Hussain and M A. Islam
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202.