Spawning Latency Period in Hormonal Induced Reproduction of Snow trout (Schizothorax zarudnyi (Nikolskii, 1897))

Abstract

Background The breeding performance is an important parameter to evaluate the breeding success in captivity conditions. The optimum dose of hormone in combination with latency period is desirable for getting best breeding performance in fish..Objectives The objective of the study was to find the spawning latency period in the hormonal induced reproduction of Snow trout with two inducers (Ovaprim and hCG) separately and in combination. Materials And Methods The fish spawners were randomly divided into five groups and treated with Ovaprim, Ovaprim and high dose of hCG, Ovaprim and low dose ofhCG, hCG and saline water as control..Results The results suggested that Ovaprim and high dose of hCG treatment lead to shorter latency time (40 hours and 40 minutes), but ovulation percent, percentage of live embryos in the eyed stage and ovulation synchronization were lower than treated groups with Ovaprim alone or Ovaprim and low dose of hCG. Females from the control and hCG groups did not spawn..Conclusions The highest hormonal stimulation effectiveness was recorded in the group in which one hormonal substance (Ovaprim) was applied. Therefore the accurate ovulation time of snow trout, Schizothorax zarudnyi was difficult to be predicted..