Effect of feeding by yeast (Saccharomyces cerevisiae) as a probiotic, in contrast with salinity stress and on intestinal histology in rainbow trout (Oncorhynchus mykiss) fry

Subject Areas : New Technologies in Aquaculture Development

M.  Pooramini ¹ (M.Sc. student Dept. of Fisheries and Environmental Gorgan University of Agricultural Sciences and Natural Resources, Iran)
A.  Kamali ² (Faculty member Dept. of Fisheries and Environmental, Gorgan University of Agricultural Sciences and Natural Resources, Iran)
A.  Hajimoradloo ³ (Faculty member Dept. of Fisheries and Environmental, Gorgan University of Agricultural Sciences and Natural Resources, Iran)
R.  Ghorbani ⁴ (Faculty member Dept. of Fisheries and Environmental, Gorgan University of Agricultural Sciences and Natural Resources, Iran)
M.  Alizadeh ⁵ (Fisheries Research Center of Iran, Yazd)

Received: 2019-11-06 Accepted : 2019-11-06 Published : 2008-05-21

Keywords: Resistance, Rainbow trout, Probiotic, Histology, Saccharomyces cerevisiae var. elipsoidous,

Abstract :

            Improvement of growth and resistance against the environmental stress is one of the main functions of probiotics. In this study, the strain of Saccharomyces cerevisiae var. elipsoidous was tested as a probiotic in the diet of rainbow trout (Oncorhynchus mykiss) fry (163±26.27mg) during 25 days after yolk absorption. The yeast was added to the diet plates in three levels (1, 5, 10% w/w) and with three triplications. Besides, a treatment with cod oil (without yeast) was used and the results were compared with that of control group. The yeast effect on rainbow trout fry mortality was not significant along the rearing period. Histological finding showed no difference in the treatments too. Challenging with different levels of salinity after 24 hours showed that treatments contained yeast as a probiotic had 100% survival (p>0.05) and showed significant differences with cod oil treatment (without yeast) and control (p<0.05).