Comparative efficacy of ovaprim and ovatide for induced breeding of freshwater dwarf gourami (Trichogaster lalius)

An experiment on induced breeding of dwarf gourami Trichogaster lalius (Hamilton, 1822) using ovaprim and ovatide hormone was carried out. This study consists of four treatments each with three replications. The objective of the experiment was to find out the effective dose of ovaprim and ovatide for induced breeding. A total of 80 fish individuals were selected for induced breeding, out of which 48 were males and 32 were females. Brood fish were kept in the ratio of 1:1, 2:1 and 3:1 for breeding purpose. Female brood fish were injected at the rate of 0.4, 0.6, 0.8 and 1 ml ovaprim and ovatide/kg body weight while the males were injected with 0.2, .4, 0.6 and 0.8 ml ovaprim and ovatide/kg body weight respectively in T1, T2, T3 and T4 at the same time. The results indicated variation in fertilization rate, latency period, egg output and hatching rate in response to different treatments. Spawning was occurred between 20-24 hrs of injection in all the experiments at 26.33±0.88 °C water temperature. Among all the experimental trials, the highest fertilization rate was observed in T3 (96.15±0.60) of E2 and the highest hatching rate was observed in T3 (92.49±1.00) of E2.