SURVIVAL RATE OF CAVIAR AND LARVAE OF PURE STURGEON FISH SPECIES AND THEIR HYBRIDS
The purpose of the study was to study the survival of eggs and larvae of the pure species of sterlet and sturgeon hybrids at a fish breeding enterprise at the stages of eggs, the beginning of respiratory movements, in general, for the entire period of the study. The research material was producers, caviar, larvae and larvae of the original fish species - sterlet, and hybrids of Siberian sturgeon × Russian sturgeon, sterlet × beluga, sterlet × sturgeon, grown and obtained at the Neptune fish breeding factory. The results of the experiment showed that the survival of prelarvae and larvae at Neptune LLC varies quite widely. The lowest survival was observed in hybrids of the Siberian sturgeon × Russian sturgeon. At the onset of respiratory movements, they had the largest withdrawal that remained for the entire study period. The highest survival was observed in sterlet × beluga hybrids - 74.4%. The same hybrids also had the lowest mortality at the stage of the onset of respiratory movements. Producers were correctly selected for this group of fish. Also, the best survival of these hybrids was possible due to the effect of heterosis, inheriting a certain set of alleles of various genes from their heterogeneous parents. The reason for the high mortality of the larvae can be due to both the low quality of the producer and possible developmental abnormalities and genetic diseases in the larvae.