In the present experiment, which was carried out for the first time in Iran, the crossbreeding of Acipenser nudiventris with Acipenser stellatus was subjected to a study. During the hybridization process, which was carried out using five brooders in one treatment, 633000 ova were obtained and the 174937 produced crossbred larva as well as 27648Acipenser stellatus larva, used as controls, were also studied. The results of this study revealed that the fertilization rate in the hybrid species was 79%, while it was very lower in the control species, only 30%. On the other hand the hatching rate in the hybrid species was only 6%, which was very lower than the hatching rate in the Acipenser stellatus. During the breeding process the hybrid fries grew and survived better than the Acipenser stellatus fries. The average daily growth of the hybrids was 55.22 mg, while the controls grew 34.62 mg daily. The morphometric study on the hybrid fries revealed that they resembled more Acipenser nudivent.....