Evaluation of growth performance, carcass composition and hematological indices in rainbow trout, Oncorhynchus mykiss, fed with encapsulated Lactobacillus rhamnosus

Abstract

The present study was conducted to evaluate the effect of probiotic bacteria Lactobacillus rhamnosus encapsulated with alginate and resistant starch (Hi maize) coated by chitosan on the growth and hematological indices as well as carcass composition in rainbow trout (Oncorhynchus mykiss). Rainbow trout fingerlings averaged 19.49 ± 0.32 g in weight were fed with diets containing encapsulated probiotic, free probiotic, and diet containing capsules without bacteria (positive control) as well as control diet without probiotics for 60 days. The results exhibited that there were significant differences in growth rate, weight gain, specific growth rate and feed conversion ratio in different groups. So that, the best results were obtained in the encapsulated probiotic group (p0.05). Totally, the results suggest that encapsulation of L. rhamnosus can increase the potential for probiotic employing in aquaculture.

Keywords

• lactobacillus rhamnosus
• encapsulation
• growth
• probiotics
• hematological indices
• oncorhynchus mykiss