Abnormal development in the ovaries of Oreochromis niloticus Linn (Perciformes: Cichlidae) in Nigeria

Five specimens of Oreochromis niloticus with abnormal ovaries were encountered in Oba Dam Reservoir, a man-made lake situated in Ibadan, Nigeria. One of those specimens was found to possess two pairs of ovaries and the rest one pair each with very unequal lobes. The fecundity of mature eggs was estimated. The fat, protein and water of these eggs were determined and compared with those of normal eggs. The result did not suggest any biochemical difference between the eggs from normal and abnormal ovaries.