اثر انواع انكوباتورها (يوشچنكو، ويس، تراف و يوشنچنكو تغيير يافته ) بر ميزان تفريخ و مدت زمان انكوباسيون تخم تاس ماهي ايراني acipenser persicus(borodin-1897(

Effect of kinds of Incubator (youchtchenko, vase, troughf and changeable youchtchenko) on Hatching and time of incubation in Persian sturgeon (Acipenser persicus) eegs

Persian sturgeon is the most important of Caspian sturgeon species that their stocks were decreased owingto numerous reasons in recent years. As regards the importance of the sturgeon fish Artificial breeding it is necessary to study all process and procedures of it very carfully. one stage of Artificial propagation is incubation that if the products increase, incubator system will improve. In Spring(2007) Effect of kinds of incubator:youchtchenko, vase, troughf and changeable! youchtchenko(consist of youchtchenko and troughf) on Persian sturgeon eggs are considered. At the beginning, matured eggs of female sturgeon fish were chosen and after making the artificial breeding process by the male sperm and removing of adhesivness of them, and equal amount of matured eggs were transferred to incubators. According to statistics, the highest of hatching percentage relate to vase incubator(%74.9) and the least of hatching percentage relate to troughf incubator (%20) also hatching percentage in youchtchenko incubator was (%60.1) and changeable youchtchenko incubator was (%54.8), thus mortality percentage in incubator: youchtchenko, vase, troughf and changeable youchtchenko were consecutively (%39.8, %25.1, %80, %45.1) and time of incubation was in youchtchenko incubator 1782.2 degree/hour, vase incubator 1647.2 degree/hour , trough incubator1679 degree/hour and changeable youchtchenko incubator 1736.2 degree/hour .Considering efficiency and work manner of these incubators were realized that vase incubator had the highest hatching percentage and the lest time of incubation.