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Abstract

The present study was conducted to detect the prevalence of mycotoxins in fish feeds and to assess their effect on fish health and growth as well as to monitor the effect of adding yeast on the improvement of different parameters of intoxicated fish invitro. The aflatoxins and ochratoxins were measured in ration samples using Fluorometeric method and he effects of experimental feeding of ochratoxins (OA) and aflatoxins (AFs) contaminated ration on Tilapia niloticus was studied. The body weight gain in fish fed on ration contaminated with AFs and OA was significantly improved after addition of yeast to the mycotoxicated feed. On the other hand, the hepatosomatic index calculated in the present experiment was increased after administration of yeast to fish with the mycotoxicated feed. Currently, no aflatoxins and ochratoxins residues levels in flesh of Tilapia niloticus were detected at the end of experimental period. The histopathological examination of liver and kidney tissues of fish in treated groups was carried out as well. The beneficial effect of yeast was detected as a marked improvement of hepatic features.