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Studies were conducted on the gonad morphology, gonadosomatic index (GSI), fecundity and egg size of Gymnarchus niloticus in Lekki lagoon. 420 fish samples comprising of 150 females and 270 males were examined giving a female to male ratio of 1:1.8. Gonad morphology revealed unpaired gonad in both sex. Fecundity ranged "between" 750 to 1291 with a mean of 925.61 ± 106.90SD and it correlated significantly (P<0.05) with gonad weight (r=0.63) and standard length (r=0.64). Mean oocyte diameter wasfatcat:lf37ot42kfcvhm6gf35d5uecey