Effects of boron mi̇neral on growth performance and nutri̇ent composi̇ti̇on of rai̇nbow trout (Oncorhynchus mykiss

In this study, boric acid was added to the rainbow trout diet at the rates of 0.00%, 0.01%, 0.05%, 0.10% and 0.20% and fed for 90 days. The effects of boric acid on rainbow trout growth parameters and nutritional composition were investigated. The growth parameters in the study were as follows: live weight gain (WG), feed intake amount, feed conversion ratio, protein activity ratio (PER), specific growth rate (SGR), survival rate, economic conversion rate (ECR) and economic profit index ( EPI) were investigated. The total crude protein, lipid, crude ash and moisture content were calculated as nutrient content. Rainbow trout with an initial weight of 92.04± g reached 195.05 ± 1.69 g, 202.69 ± 1.94 g, 217.53 ± 2.84 g, 195.25 ± 2.18 g and 181.20 ± 1.89 g respectively at the end of the research. The best growth performance was observed in the group supplemented with 0.05% boric acid while the lowest growth performance was observed in the group supplemented with boric acid at 0.20%. The highest feed intake was observed in the control group while the lowest feed consumption was observed in the group supplemented with boric acid by 0.20% and the feed conversion ratio of 0.05% in the group supplemented with boron. Protein ratios of fish in the study were; 17.96 ± 0.005%, 18.16 ± 0.008%, 18.35 ± 0.066%, 18.26 ± 0.098% and 18.06 ± 0.012%, respectively. The moisture contents of fish meat are; 77,7 ± 0,051%, 77,15 ± 0,004%, 76,25 ± 0,03%, 77,17 ± 0,12% and 77,52 ± 0,020%, fat ratio 2,47 ± 0,007%, 2,81 ± 0,043, 3, 39 ± 0,006%, 2,59 ± 0,054% and 2,37 ± 0,038%, and crude ash ratios; 1,60 ± 0,007%, 1,79 ± 0,010%, 1,90 ± 0,007%, 1,94 ± 0,009% and 2,023 ± 0,001%, respectively.