Open AccessEvaluations of H ilyses™, fermented S accharomyces cerevisiae , on rainbow trout ( O ncorhynchus mykiss ) growth performance, enzymatic activities and gastrointestinal structure
Author(s) -
Heidarieh M.,
Mirvaghefi A.R.,
Akbari M.,
Sheikhzadeh N.,
KamyabiMoghaddam Z.,
Askari H.,
Shahbazfar A.A.
Publication year - 2013
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/j.1365-2095.2012.00973.x
Subject(s) - rainbow trout , biology , digestive enzyme , amylase , yeast , zoology , feed conversion ratio , food science , trout , saccharomyces cerevisiae , trypsin , fermentation , juvenile , enzyme , biochemistry , fishery , fish <actinopterygii> , body weight , endocrinology , ecology
This study examined the effects of Hilyses™, fermented S accharomyces cerevisiae ( S . cerevisiae ), on rainbow trout growth performance, haematological parameters, digestive enzyme activities and gastrointestinal structure. Rainbow trout (mean weight 100–110 g) were fed dietary H ilyses™ (5 g kg −1 ) and control diet without H ilyses™ for 50 days. Results of this study demonstrated that yeast supplementation in treatment group resulted in increased feed intake, followed by improved feed conversion ratio ( FCR ) and growth performance. Significant increases were also observed in trypsin and amylase activities in juvenile fish fed treatment diet. Light microscopy demonstrated that both groups of fish displayed normal morphology of proximal intestine and pyloric caeca. In yeast‐treated group, higher density of the goblet cells per villus in the proximal intestine was shown. No effects on haematological parameters and carcass chemical composition were noted. It is therefore possible to use fermented S . cerevisiae supplementation to significantly improve the gastrointestinal structure and growth performance in rainbow trout.