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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