The effects of using peanut meal in rainbow trout (Oncorhynchus mykiss) diets on the growth performance and some blood parameters

Abstract

In this trial, rainbow trouts (71.69±1.21 g) were fed with feeds containing peanut meal at different levels for 60 days and their growth performance, body compositions and some blood parameters were examined. Accordingly, 4 different trial feeds as the control feed (PNM0) that contains FM as the main source of protein, and feeds containing 10% (PNM10), 20% (PNM20) and 30% (PNM30) peanut meal as an alternative to fishmeal were prepared. At the end of the feeding period, fish that were fed with PNM10 gained as much weight as those fed with the control feed. Feed conversion ratio (FCR) and specific growth rate (SGR) findings of rainbow trouts fed with trial feeds differed significantly from the control group as the peanut meal level used in feeds exceeded 10% (P<0.05). No significant differences were detected in terms of fillet proximate compositions (P>0.05). In the examination of the hematological parameters obtained from rainbow trouts fed with feeds containing different peanut meal levels, it was detected that there were no significant differences compared to the control group (P<0.05), whereas the serum biochemical parameters generally worsened as the level of peanut meal in the ration exceeded 10% (P<0.05). The present study demonstrated that utilization of new protein source peanut oil cake meal can be effectiveliy used to replace up to 10% of FM in diets of rainbow trout without any adverse effects of growth performance, feed utilization, hematological and serum biochemical parameters.