Abstract

A reputable fish farm in Abeokuta Ogun State Nigeria were used to carry out studies on the induced breeding of Clarias gariepinus under varying brood stock ratios Six gravid females weighing 1 00 kg each and 6 reproductively matured males weighing 1 00 kg were used for the three induced breeding trials in ratios of 2 1 1 2 and 2 3 female male respectively Females were injected at a dosage of 0 50 ml ovaprim kg body weight and 0 25 ml kg body weight for males Hatching starts after 24 hours of incubation and lasted for 6 hours Dissolved oxygen pH ammonium ion nitrate ion levels and temperature were monitored Mean weight of eggs produced is 285 00 g 65 00 with a relative percentage weight of eggs to body weight of 26 to 33 Also fecundity was the same in all the treatments with a value of 66 000 100 eggs The lowest pseudo-gonadosomatic index of 41 50 6 50 was recorded in treatment 1 while the highest value of 51 00 3 00 was recorded in treatment 2 The effect of the varying brood stock female male ratios in all the trials were not significantly different at P 0 05 as indicated by the number of fertilized eggs number of hatched eggs larval production and survival