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Download tubifex worms fish food10/6/2023 Tubificids are aquatic oligochaete worms (F- Naididae, O- Haplotaxida, P- Annelida) distributed all over the world. It was concluded that introduction of sorting sieves to catfish hatchery will reduce drudgery in fry sorting while increasing percentage survival and profitability at the same time. Economic analysis of the trial gave Marginal Rate of Return (MRR) of N5.50k in favour of T1. At harvest (10th week), there were more numbers of small (4-6 cm) and large (8-12 cm) sizes of juveniles in T2 than T1 whereas numbers of medium (6-8 cm) size juveniles in T1 almost doubled that of T2 at a significant level (P ˂ 0.05). Survival rate from fingerlings to juveniles at the 10th week significantly (P ˂ 0.05) reduced to 62.33 ± 12.73% (T1) and 40.55 ± 8.44% (T2) respectively. The percentage hatching was high, 78.33 ± 4.08% and 76.92 ± 3.19% in T1 and T2 respectively but not significant (P ˃ 0.05). Sorting of fish were done on the 14th, 21st, 28th, 42nd, 56th and 70th day after hatching. Fertilized eggs were shared weight for weight between T1 and T2 and normal management procedures were followed. Broodstocks of 1500 ± 10.52 g were used for breeding. T1 utilized sorting sieves while T2 used hand manual sorting. Two hatching troughs served as Treatment 1 (T1) and Treatment 2 (T2) in each farm. The trials were set up in six farms across the State. Sorting sieves were introduced into the hatchery management of Clarias gariepinus fry in Lagos State to improve on the survival rate and growth performance of C.
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