Effect of Dietary Incorporation of Chemo-Attractants on Growth and Survival during Seed Rearing of Ompok bimaculatus (Bloch)

Özet

A 30-days experiment was conducted to evaluate the efficacy of four chemo-attractants viz. DL-alanine, betaine, Ltryptophan (TRP) and inosine monophosphate (IMP) in the diet of Ompok bimaculatus during fry rearing. Fifty numbers offifteen days weaned fry (0.0739±0.008 g; 2.32±0.06 cm) were stocked into each aerated aquariums (30.0 x 15.0 x 15.0 cm)following a completely randomized design (CRD) consisting of five treatments including control with three replicates each.Five iso-nitrogenous purified diets were prepared including four treatment diets with attractants (2%) replacing the celluloseand fed to the fishes twice a day. The highest growth was observed in the treatment fed with betaine supplemented dietfollowed by inosine monophosphate whereas, no significant difference was observed among control, DL-alanine and Ltryptophan supplementation. The highest survivability was found in L-tryptophan supplemented diet (48.66±2.4%) followedby betaine, DL-alanine, control and lowest was found in inosine monophosphate treatment (32.00±2.0). It has also observedthat there was significant difference (P>0.05) in survival between L-tryptophan and betaine supplemented diets fed groups. Itis concluded that the dietary tryptophan supplementation could be a promising aquaculture management strategy forcarnivorous fish as it showed significantly better survival without affecting the growth.