Establishment and efficiency evaluation of a simple mini hatchery for production of Oreochromis niloticus (GIFT strain) seeds

摘要: A simple technology mini hatchery was established for small scale farmers to meet their own GIFT seed requirements. Different shapes and sizes of jars were trialed incubation eggs yolk-sac larvae. Concaved bottom round plastic bottles (4 L) rectangular (3 trays gave the best hatchability survival larvae respectively. The stocking density 500 eggs/larvae L -1 . Optimised flow rate into rearing 2.70±0.18 min 5.40±0.14 Two gravel filters (15 20 made with discarded low cost material purified water from containers directed a recirculation system. Production efficiency this compared hapa breeding method. hapas having 10 m 3 size 1.6 mm mesh positioned in an earthen pond. Each stocked 40 broodfish at 1:1 female male ratio. In Phase I study (60 days), collected Hapa placed determined. parallel, free-swimming fry counted II every 14 days. continued same way (next 60 days) by interchanging brood fish between II. Yield (24,000 fry) significantly different (P≤0.05) method (4,879 indicating that could serve as productive model support production. Keywords. Incubation; mini-hatchery; Tilapia; hatchability;