Dietary effect of celmanax® on growth factor, intestine histology and yersiniosis resistance in rainbow trout (Oncorhynchus mykiss)

Document Type : Research Paper

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Abstract

This study aims to analyse the effect of complementing the rations of breeding rainbow trout with different concentrations levels of celmanax® prebiotic, which contains Saccharomyces cerevisia associated compounds with Mannan-oligosaccharide on the growth indexes and histologic effects of the prebiotic and the gastrointestinal tract and also measuring of the resistance of breeding fishes fed with this prebiotic in infection to the yersiniosis. Three concentration levels of prebiotic (0, 0.1, 0.5 and 1 %) were mixed into pellets. The fish (19.08±1.45gr) were fed a supplemented commercial diet for 60 days in four treatments and each treatment with three replications. Also, on day 60 of study, the Yersinia ruckeri bacterium was injected empirically into all of our groups. This study’s results showed that complementing rainbow trout rations with different concentrations level of celmanax® (P<0.05) increased the final weight, daily growth rate, specific growth factors, Food efficiency index and feed conversion so significantly. Histopathologic results also showed significantly changes namely, increase in the thickness of the mucous membranes, length of the villi and the muscle layer in the gastrointestinal tract of the fish which where fed with prebiotic in comparison with the control group (P<0.05). The results also showed that those fish that where fed with prebiotic had significantly lower death rates compared to the control group (p<0.05). According to these findings, it can be concluded that different concentrations level of celmanax® prebiotics could be used in order to increase the growth, histological changes in the gastrointestinal tract and rainbow trout resistance.

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Iranian Scientific Fisheries Journal
Volume 26, Issue 6 - Serial Number 104
January and February 2018
Pages 81-92

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