Larissa-Pélagie Ella KOUADIO^1,, Ahou Rachel KOUMI¹, Safiatou COULIBALY¹, Tia Jean GONNETY², Boua Célestin ATSE¹

This study was carried out with the aim of reducing the cost of aquaculture feeds in Côte d'Ivoire. Therefore, three (3) fish feeds for the reproduction stage in the three main agro-ecological zones of the country were formulated (SG1, SG2 and G). Male and female Oreochromis niloticus broodstock with mean initial masses of 62.63 ± 1.23 g and 53.88 ± 4.54 g respectively were distributed in nine 9 m³ floating cages at a density (1 ind/m²) of one male for every three females. The different batches of fish were fed at 3-2.5% of biomass with feed containing 35% protein. Feed was distributed twice a day at 9 am and 5 pm for two months. At the end of the rearing period, all the fish were weighed individually and samples were dissected, the gonads removed and weighed. A sample of the ovaries was taken so that the oocytes could be counted under an electron microscope. In hapas, after two months of rearing, the condition indices for the males were 1.20 ± 0.00, 1.42 ± 0.10 and 1.63 ± 0.06. Gonadal weight ranged from 1.26 ± 0.08 to 1.53 ± 0.9 g. In females, absolute fecundity ranged from 572 ± 51 to 644 ± 44 oocytes/female. Oocyte diameter ranged from 3.02 ± 0.07 to 3.28 ± 0.02 mm. Relative fertility values ranged from 7683.2 ± 756.91 to 8257.28 ± 455.6.

agro-ecological zones, tilapia, reproduction, growth, Côte d’Ivoire