Effect of Vanagen probiotic on growth indices and survival rate of rainbow trout (Oncorhynchus mykiss)

Subject Areas : New Technologies in Aquaculture Development

Received: 2020-12-08 Accepted : 2020-12-08 Published : 2011-08-23

Keywords: growth, Rainbow trout, feeding, Keywords: Survival, Vanagen,

Abstract :

Abstract In this research, the effect of probiotic Vanagen as growth and safety stimulator on growth factors and survival of rainbow trout fingerling is investigated in two months. Treatments included four levels of Vanagen (0.62, 1.25, 2.5, 5 gr per kg feed) and a control. The experiment was conducted in fifteen circular concrete lavers (3 meter in diameter and 1.5 meter depth) located in Arak Mutation and Growth Workshop of Sardabi Ghezel Parvar Fish. 100 rainbow trout fingerlings (average weight 22±1 gr) were stocked in each laver. The fish were fed about /.3 of their body weight, four times per days. Biometry factors were observers every ten days. The survey of growth factor indicates the most body weight growth in 5-gr Vanagen treatment (=49 grams increase). But there was no significant difference in 2.5-gr Vanagen treatment P>0.05 level. The results showed that the most survival rate was observed in 2.5-gr Vanagen treatment (92.3) which showed a significant difference in 0.62-gr Vanagen treatment p < 0.05. The addition of Vanagen led to improvement in: body weight¸ survival¸ percent body weight¸ specific growth rate¸ protein efficiency ratio¸ feed conversion ratio¸ daily growth index.