The Effect of Using Peanut Meal Instead of Soybean Meal on Growth, Biochemical Composition and Fillet Color of Rainbow Trout (Oncorhynchus mykiss Walbaum, 1792)

The aim of this study was to determine the effect of using peanut meal instead ofsoybean meal in rainbow trout (Oncorhynchus mykiss Walbaum, 1792) feeds on growthperformance, biochemical composition and fillet color. For this purpose, rainbow trout(108.70±0.09 g) were fed for eight weeks with four different diets adjusted as iso-nitrogenic (45%protein), iso-lipidic (19% lipid) and iso-energetic (22 kJ g-1). While the CF (commercial feed)group was fed with commercial feed, three experimental diets containing 0% (Control-C), 50%(PNM50) and 100% (PNM100) peanut meal were formulated for the other groups. As a result ofthe 8 weeks study, the best final weight, weight gain and specific growth rate were found PNM50group and the difference among groups was found significant. (p<0.05). The use of peanut mealinstead of soybean meal in rainbow trout diets decreased fish meat protein ratios compared to CFand C groups. The qualities of redness, yellowness and hue were distinct between the diets in thedorsal and caudal locations. At all the measured regions in the C and CF groups did not result inany significant difference for chroma. It is thought that the differences between the measuredregions in L*, a*, b * are due to the fillet thickness and the preservation of the fillet coloringmatter. Consequently, 50% peanut meal instead of soybean meal in trout diets could be used indiets of rainbow trout without any negative effects on growth.