FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Clarias gariepinus, hatchery, latency, Ovulin, survival
Fish production under controlled conditions (artificial breeding) using hormones depends on high gamete quality and progeny performance. This study is aimed at determining the effect of varying doses of Ovulin on the breeding performance of Clarias gariepinus in Benue State, North-Central Nigeria. Five brood stocks comprising of three females which weighed between 253.73 – 296.85 g and two males which weighed 260.06 and 282.14 g were bought from a fish pond in Gboko and University of Agriculture fish pond, Makurdi. The brood stocks were injected intramuscularly at different doses of 0.10 ml (treatment I), 0.30 ml (treatment II) and 0.50 ml (treatment III) for the females. After a latency period of 10 h, the female eggs were stripped and males sacrificed to obtain milt which was then fertilized and incubated in a flow through hatchery system at water temperature of 30oC. This was replicated in a completely randomized design and data collected were subjected to analysis of variance. The result showed that the female of treatment III had the highest fecundity (12051), weight of stripped eggs (44.42 g) and percentage of stripped eggs (14.96%). Treatment I had the highest percentage of fertilized eggs (15.27%) highest hatchability (23.77%), there was a significant difference (P<0.05) among the treatments while Treatment II had the highest survival rate of 35.42% with survival hatchling number of 59 larvae. It was concluded that Clarias gariepinus of about 253.73 and 277.13 g can successfully be induced using 0.3 and 0.1 ml/kg.b.wt. of Ovulin in Benue State, Nigeria, which was lower than the manufacturers recommended dosage of 0.5 ml/kg.b.wt. if other water quality parameters are well monitored.
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