PRELIMINARY RESULTS OF EXPERIMENTAL WORK ON PRODUCING OFFSPRING AND COMPARATIVE EVALUATION OF PURE SPECIES (WHITE STURGEON, FRINGEBARBEL STURGEON) AND THEIR INTERSPECIES HYBRIDS (WHITE STURGEON × FRINGEBARBEL STURGEON AND FRINGEBARBEL STURGEON × WHIT

The article presents the comparative results of the experimental work on studying valuable pure species offspring (white sturgeon, fringebarbel sturgeon) and their interspecies hybrid forms (white sturgeon × fringebarbel sturgeon and fringebarbel sturgeon × white sturgeon) in the early stages of ontogenesis. The tests were carried out in the research and experimental base BIOS (the Astrakhan region) in 2019. The fish-breeding and biological characteristics of the producers of parental species that participated in the crossing to produce reciprocal hybrid forms are presented. The interbreeding scheme was developed. The complex study was conducted at the stage of the early ontogenesis. Observing over eggs development took place at all significant stages of embryogenesis. The survival rates of one-day prolarvae of all experimental groups, in relation to the eggs laid for the incubation, and their weight data became the result of the experiment. The results of the experimental work will help to develop proposals for the exploitation of broodstock producers of pure sturgeon species to produce hybrid offspring, which may have increased growth and survival rates both at the stages of embryogenesis and the active feeding of larvae, and during juveniles rearing, which is a promising factor for commercial aquaculture.