Abstract
This paper presents the results of studies of the reproductive biotechnology of asp, Aspius aspius (L.), and nase, Chondrostoma nasus (L.), supplemented with unpublished materials of the authors. Reproducing these species under controlled conditions without hormonal preparations is not possible. The most frequently used preparations are carp pituitary homogenate (CPH) and gonadotropin releasing hormone analogue (GnRH) combined with a dopamine receptor antagonist. In both asp and nase, the highest percentage of ovulating females, the highest fecundity, and the highest embryo survival were attained after stimulation with Ovopel and Ovaprim. However, the results obtained with CPH were not much worse. The semen of both species was cryopreserved, which permits the long-term safeguarding of sperm genetic material.