Nutrients digestibility and growth performance of Nile tilapia (<i>Oreochromis niloticus</i>) fed on oilseed meals with crude papain enzyme

Abstract In this study, nutrients digestibility and growth performance of Nile tilapia ( Oreochromis niloticus ) fed on oilseed meals with crude papain enzyme were determined. A control diet (D1) 30% protein (CP) was formulated using fishmeal (FM), soybean meal (SBM), canola (CM) sunflower (SFM). The test diets replacing 10% CP FM by SBM (D2), CM (D3) SFM (D4), respectively. Crude in powder form incorporated at 0.06%. Digestibility trial performed chromium oxide as an inert marker. feeding 101 days conducted a 4 × 2 factorial design (D1, D2, D3 D4) inclusion levels 0.06% 0% 720 fingerlings (7 ± 3 g). randomly distributed into 8 groups replicates 30 per net hapa (2 1 m ). Fish twice daily 5% their biomass 10 am pm two equal meals. Apparent coefficients increased p &lt; 0.05) supplementation. There increase final body weight (47.32 2.10 g) than without (0%) (46.17 2.14 &gt; 0.05). Irrespective supplementation, fish FM‐based larger (56.89 1.37 those meals; (45.59 0.91 g), (43.89 2.12 (40.59 1.60 Based the tilapia. Therefore, is recommended feed additive to promote growth. However, more research determine optimum diets.