Biotechnics of artificial propagation in Schizothorax zarudnyi

The snow trout (Schizothorax zarudnyi) is a valuable and commercial species belong to cyprinidae and native to Sistan basin. The present study evaluated the induce spawning in snow trout using synthetic hormones (ovaprim) in order to achieve biotechnic of artificial propagation. Wild broodstocks (females and males: 1375 ± 108.84¡ 632 ± 17.6 g respectively) selected from Chanimeh reservoirs (Sistan¡ Iran). The females treated with quadruplet injections (0.2¡ 0.5¡ 0.5 and 0.3 ml Ovaprim/kg B.W). The distance between first¡ second and third injections were 24 h and between third and fourth was 12h. The males were injected at the time of the second females’ injections (with 0.3 ml Ovaprim/kg B.W.) The results showed spawning rate and mean working fecundity were 83.3% and 39531±7802¡ respectively. The latency period (time between first injection and ovulation) was 60.15±12.05 h¡ incubation period was 120 to 140 h (depend on water temperature (14 to 18.5º C)). Relative fecundity¡ volume of dry egg (ml)¡ number of dry egg per each milliliter¡ conversion percentage of dry egg to eyed egg¡ conversion percentage of eyed egg to larvae and number of larvae from each female was 28410.61 ± 4796.26¡ 172.5 ± 25.09¡ 275¡ 88.97 ± 0.9¡ 81.93 ± 1.15 and 34120 ± 4526.84¡ respectively. Obtained Larvae after reaching a length of 8 to 10 mm¡ who had absorbed their yolk sac for about two-thirds were transferred to fertilized earthen ponds.