Aquaculture supplies nearly half of the fish consumed worldwide. However, in Côte d’Ivoire, this sector remains underdeveloped despite abundant water resources, largely due to the poor quality of feed, which limits the growth and survival of fingerlings. This study compares the effects of three premixes (Fish Growth, Vitaflash, and GBX) on the growth and health of 1,200 Oreochromis niloticus fingerlings. The fingerlings were reared in hapas for 30 days in pond 1 at the Jean LOROUGNON GUÉDÉ University training farm in Daloa, using four test diets in duplicate: a control diet and three diets enriched with 2% premix. The fingerlings were fed three times daily. Water physicochemical parameters and fingerling growth metrics were recorded every two weeks. The pond water had an average temperature of 27.6°C, a pH of 7.5, and an average oxygen level of 5.5 mg/l. These results showed that these parameters were favorable for raising Nile Tilapia Oreochromis niloticus. Conserning the premixes, results indicated that the GBX premix yielded the best outcomes for mortality (2.8%), weight (20.5 g), and length (10.3 cm). While GBX appears to be the most effective premix. In summary, this study recommends the use of GBX in commercial feed formulations for Nile tilapia (Oreochromis niloticus).

To assess the influence of the breeding structure on the effectiveness of sexual inversion, growth performance and economic returns of Bouaké strain of Nile tilapia Oreochromis niloticus, hormonal treatment with 17-α-méthytestosterone was performed snapped installed in concrete basin (lot I), in happa) implanted in earthen pond (lot II) and concrete basin snapped without (lot III). The success rate of sexual inversion is 100% male in the three lots. The final average weights recorded were 2,35 ± 0,24 g (lot II), 2,06 ± 0,72 g (lot I) and 1,53 ± 0,65 g (lot III). The daily growth and the specific growth rate significantly different only between the Lot II and Lot III. The survival rate, the nutrient ratio and condition factor were not affected by the farming structure. The cost of producing a fry of 5 g recorded for Lot III (19,82 ± 0,40 F CFA) was significantly (p <0,05) higher than that obtained in the lot II (14,59 ± 1,49 CFA) and to that noted in the lot I (16,12 ± 0,10 F CFA). Profitability indices are 2,4 ± 0,25 for Lot II, 2,17 ± 0,12 for Lot I and 1,76 ± 0,25 for Lot III. The best results were recorded at the happas implanted pond followed by those installed in concrete basin.