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Mekkawy, I.A.A. and Osman, A.G.M. 2006. Ultrastructural studies of the morphological variations of the egg surface and envelopes of the African catfish Clarias gariepinus (Burchell, 1822) before and after fertilisation with a discussion of fertilisation mechanism. Scientia Marina. 70, S2 (Oct. 2006), 23–40. DOI:https://doi.org/10.3989/scimar.2006.70s223.