HETEROTROPHIC MICROORGANISMS AS INDICATORS OF HABITAT UNDER CONDITIONS OF THE FISH-REARING
Microorganisms are an informative group of bioindication in evaluating the state of the habitat of aquatic organisms under artificial conditions. The diversity changes of heterotrophic microorganisms in the composition of aquatic microbial communities are associated with temperature regime and the concentration of organic substances. The purpose of this study was the molecular genetic analysis of microbial communities formed in the water and on the egg's surface of Baikal omul under artificial breeding. A significant diversity of aquatic heterotrophs, wide-spread in freshwater reservoirs of different trophic levels was determined in the water of the egg's incubator. Potential fish pathogens growing at increased temperature and high content of organic substances were revealed among the typical aquatic organotrophic microorganisms in the microbial community from the pond. Heterotrophic microorganisms associated with fish eggs were presented specific for natural waters, as well as symbiotic, and potentially pathogenic species. Indicators of habitat of aquatic organisms under artificial breeding are chemoorganoheterotrophic microorganisms. However it is necessary to take into account the physiological peculiarity of their metabolism, the ability to form biofilms and the existence of adhesion to substrates.