The effect of probiotic Bacilli on feed efficiency and carcass quality of rainbow trout, Oncorhynchus mykiss fry

In this study, the effects of probiotics bacilli on the feed efficiency and carcass quality in rainbow trout, Oncorhynchus mykiss, fries were studied using a commercial product Protexin Aquatech. A blend of five strains of probiotic bacilli (Basilus licheniformis, B. subtilis, B. polymyxa, B. laterosporus and B. circulans) was used through the supplementation of diets for 60 days. Fish fry with an average weight of 463 ± 32 mg were used. The experimental diets were supplemented with mixture of the five bacilli at concentrations of 1×106 (D1) 1×107 (D2) and 1×108 (D3), (CFU per 100 g food), and a control (probiotics-free diet). The feeding rate was varied between 5 and 8% of body weight. The results indicated that D2 treatment had significantly better growth and feed conversion ratio than the control group and D1 treatment. Results showed that in the experimental treatments, probiotics had a significant positive effect on protein efficiency ratio, lipid efficiency ratio and protein productive value compared to the control treatment (P<0.05). The dry matter, crude protein and crude lipid of fry carcass in D2 treatments, were significantly increased (P<0.05). The results showed that the probiotics bacilli increased feed efficiency and growth performance in rainbow trout fry

Effect of probiotic (Moltibehsil) and prebiotic (Behsam) on feed performances, energy losses and ammonia and urea excretions in grass carp, Ctenophryngodon idella larvae

This study was conducted to evaluate the effects of two commercial prebiotic and probiotic called Behsam and Behsil, respectively, in feeding performance, ammonia and urea excretions as well as energy losses in grass carp, Ctenophryngodon idella fry. Three levels of Behsam and Behsil (200, 400 and 600 mg/kgof diet) were supplemented to experimental diets and fed to grass carp fry (initial weight of 625.15 ± 10.12 mg). The present study was conducted in a completely randomized design. At the end of experiment, the fish final weight, food conversion ratio, protein and lipid efficiency ratio of the grass carps fed supplemented diet with different levels of Behsam and Behsil had significantly difference with control group (p<0.05). The results clearly exhibited that the different levels of Behsam and Behsil had positive effects on the ammonia and urea excretions in fish fry and also the energy decreasing rate in experimental treatments in comparison with control group. Minimum of ammonia-N and urea-N excretions were obtained in treatment Behsam 600. The maximum energy losses via excretion of ammonia and urea were obtained in control. However, the minimum energy losses were obtained in fish fry fed with 600 mg/kg Behsam. The total energy losses by nitrogenous wastes such as ammonia, urea and energy losses rate (%) per energy intake were decreased in the various experimental treatments in comparison with control. Maximum energy expenditure was detected in control group, but it decreased in experimental treatments and minimum value was obtained in treatment containing 600 mg/kg Behsam. In this study, it was found that the various Behsam and Behsil levels in rearing grass carp fry exhibit different effects on feeding performance, ammonia and urea excretions as well as energy losses in this fish

The effect of blend of isolated bacillus and Saccharomyces cerevisiae from gut of Beluga (Huso huso) on growth and feeding parameters of silver carp (Hypophthalmichthys molitrix) larvae

A 33-day feeding experiment was conducted to assess the effects of supplemented diets with sturgeon intestinal bacteria as probiotics in feeding of silver carp (Hypophthalmichthys molitrix) larvaewith average weight 200 ± 10 mg. These probiotics were isolated from gut of ten healthy fingerlings of Beluga (Huso huso) with average weight of (5.51 ± 0.31 g). Four diets (S1, S2, S3 and S4) were prepared containing similar ingredient composition and were supplemented with blend of three probiotics (Bacillus licheniformis, Bacillus subtilis and yeast of Saccharomyces cerevisiae) at four different levels (0, 1.5×106, 3×106, 4.5×106 cells per 100 g of diet, respectively). At the end of experiment, the Silver carp larvae fed probiotic supplemented diet had an improved and growth feeding performance compared to fish larvae not fed probiotics. Rearing of silver carp with feeding by experimental diets of, S2 and S3 (3×106 and 4.5×106 cells 100 g) resulted in better growth and feeding parameters in compared with the control. These probiotics resulted in a significant increase (P<0.05) in specific growth rate and food conversion efficiency of fish larvae in experimental treatments. Therefore the tested microorganisms in this study had tremendous potential as probiotic for commercially produced of silver carp larvae