The effect of Zingiber officinale extract on growth factors, survival and carcass composition in Rainbow trout (Oncorhynchus mykiss)

In recent years, the use of plant-based safety stimuli in aquaculture has become increasingly common. Ginger has many properties and is often used as a medicinal and spice plant for food use. In the present study, the effects of different levels of ginger extract on diet were evaluated on growth indices, survival and carcass biochemical composition of rainbow trout with a mean weight of 45.80±3.60 g for 56 days. The present study was conducted to evaluate different levels of ginger extract Zingiber officinale on growth indices, carcass biochemical composition, hematological and blood biochemical parameters of rainbow trout Oncorhynchus mykiss with an average weight of 45.80±3.60 g for 56 days. Seven hundred and fifty fish were randomly distributed in fifteen 3000L cylindrical fiberglass tanks. Fish were distributed completely randomly in 15 cylindrical 3,000-liter fiberglass tanks. Ginger extract in five levels of 0, 1, 3, 6 and 10 g/kg was added to the experimental diet and the fish were fed for 8 weeks in the same culture conditions. Results showed that specific growth rate, body weight gain and average daily growth rate and feed conversion ratio were significantly different in the 10 gr/kg group (p < 0.05), whereas gonadosomatic index, condition index and protein efficiency coefficient showed no significant difference (P>0.05). Also, the ginger extract did not affect body protein, fat, ash and moisture content (P>0.05). The results showed that adding 1% of ginger to the diet improved growth indices in rainbow trout.