IMPACT OF VARYING AMOUNTS OF PEANUT (Arachis hypogaea) MEAL ON RAINBOW TROUT (Oncorhynchus mykiss) DIETS INSTEAD OF SOYBEAN MEAL ON THE ELEMENTAL COMPOSITION AND BIOMAGNIFICATION FACTORS IN FILLETS

In this study, the effects of using different ratios of peanut meal (PNM) instead of soybean meal in rainbow trout (Oncorhynchus mykiss) diet on elemental composition and biomagnification factor (BMF) were evaluated for 12 weeks. Three experimental diets containing 50% (PNM50), 75% (PNM75), and 100% (PNM100) peanut meal were prepared. In the study, two control groups were fed a commercial feed (CF) and a diet containing 0% PNM (C), respectively. The CF had the greatest Ca/P ratio and the highest Se, Ca, and P levels, and these values were also significantly different from the other experimental diets. The PNM75 diet had significantly higher Mn and Cu values (p<0.05). Fe, Mg, and Na levels increased with the increasing level of PNM ratios. The PNM100 group had the highest values of these elements. At the end of the study, the CF group had high BMF of K, Mg, Mn, and Cu elements. Compared with the C group, rainbow trout fillets in the CF group had high BMFs of Ca, Fe, Na, and Se. The BMF of the P element was high in PNM75 group. In summary, the element values of rainbow trout fillets did not have an adverse effect when using PNM instead of soybean meal in their diets