Comparative studies on the reproductive indices of the ovaries of Clarias gariepinus and Heterotis niloticus

The techniques for induced breeding of Clarias gariepinus has been developed and mastered by fish breeders. There is however no record of successful induced breeding of Heterotis niloticus in captivity. In this study, the reproductive indices of the ovaries, of the two fish species were compared. The ovaries of sexually matured samples were extracted and their weights measured. The mean gonadosomatic index (GSI) of C. gariepinus was 3.94% while that of H. niloticus was 1.61 %. The mean condition factor (K) was 5.28 in C. gariepinus while it was 2.03 in H. niloticus. Gonad and body weight relationship was positively correlated in both species (r = 0.69 in C. gariepinus and r = 0.37 in H. niloticus. Also, an inverse relationship existed between the body weight and GSI in the two species (r = -0.3 5 inC. gariepinus and r = -0.06 in H. niloticus.

Bibliographic Details

Main Authors:	Omeje, V.O., Olufemi, B.E., Madu, C.T., Nnaji, J.C., Musa, Y.M.
Format:	conference_item biblioteca
Language:	English
Published:	FISON 2008
Subjects:	Aquaculture, Clarias gariepinus, Heterotis niloticus, Nigeria, Ibadan, freshwater environment, Reproduction, Gonadosomatic index, Morphometry,
Online Access:	http://hdl.handle.net/1834/37980
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