ШЛЯХИ ПІДВИЩЕННЯ КРІОРЕЗИСТЕНТНОСТІ СПЕРМАТОЗОЇДІВ ОСЕТРОВИХ

A significant decrease in the number and genetic diversity of sturgeons is taking place at the current stage. It is not possible to solve the problems concerning the preservation of their biodiversity without the usage of rational approaches and biotech techniques. One of the promising directions for solving this problem is a sperm cryoconservation. However, despite the significant number of studies in this direction, some research issues still remain completely unresolved. For example, the composition of cryoprotective solution used for sperm freezing need to be optimized. The studies, highlighted in this paper, were aimed at finding the ways to optimize the process of sturgeon (namely sterlet) sperm cryoconservation in order to increase the quality of defrosted product and fish-biological results of the fish egg fertilization. The conducted research allowed us to establish the positive results of introduction of a new substances into the cryoprotective solution. The method of the sterlet sperm freezing was also optimized, allowing to improve the investigated parameters. Obtained results can be promising in sturgeon aquaculture, as well as for the sperm and fish egg deposition of rare and endangered fish species in cryobanks. [ABSTRACT FROM AUTHOR]