Comparative effects of Ovaprim™ and Ovapass™ hormones on some reproductive characteristics of Schizothorax zarudnyi


1 Department of Fisheries, Faculty of Natural Resources, University of Zabol, Zabol, Iran.

2 Department of Aquatic Sciences, Hamoun International Wetland Institute, Research Institute of Zabol, Zabol, Iran.



This study was conducted to compare the effectiveness of Ovaprim and Ovapass hormones to induce spawning in Schizothorax zarudnyi. The female (n=48; 1535.12±180.09 g) and male broodstocks (n=53; 752.00±48.30 g) were randomLy allocated in 4 experimental groups including T1: females which received 0.2, 0.5 and 0.5 mL /kg body weight (BW) Ovaprim with 24-h time intervals, T2: females which treated with 0.5 and 0.5 mL /kg BW Ovapass with 12-h time intervals, T3: females were injected with 0.2, 0.5 and 0.5 mL /kg BW Ovapass with 24-h time intervals, and T4: females were injected with a combination of Ovaprim (0.2 mL/kg) and Ovapass (0.5 and 0.5 mL/kg BW) with 24-h time intervals. The amount of injection in the first stage was 10%, the second stage was 90%, and the male fish were simultaneously injected with the second stage of the females at 0.3 mL/kg. The results showed that the highest rate of fertilization was detected in treatments 2 and 4 (93.33% and 92.33%, respectively), which had a significant difference with other groups (p<0.05). No significant differences were observed between the treatments in the indices of relative and working fecundity and dry egg diameter (p>0.05). The lowest and highest latency period was observed in treatments 2 (27.33± 0.66 h) and 1 (36.20±3.77 h), respectively (p<0.05). The results of this study clearly suggested that the Iranian Ovapass hormone is highly effective for S. zarudnyi reproduction and might be successfully replace with Ovaprim.