Study was carried out on Auchenoglanis occidentalis from River Rima, North-Western Nigeria to provide information on gonadosomatic index, fecundity and egg size. Eight hundred samples of the fish (398 females, 399 males and 3 with unidentified sexes were examined between November 2005 and December 2008. GSI, fecundity and diameter of the eggs were analysed. Linear regression analysis was used to determine the relationship between GSI, fecundity and egg size with total length (TL), total weight (TW), gonad weight (GW) and gonad maturation stages (MS). Six stages of gonad maturation were established. Mean gonadosomatic index (GSI) for female and males were 2.01±2.75SD and 0.17±0.32SD, respectively. It varied with sex, size class and gonad maturation stage, and exhibited significant (P
Key words: Gonadosomatic index, fecundity, egg size, A. occidentalis
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