Definition of indicating microorganisms for monitoring fishes infectious diseases on the example of Perca fluviatilis (Lake Arahley, Zabaikalskiy kray)

Many microorganisms-activators of fishes infectious diseases are eurysynusic representatives of water microbiocenosis in natural reservoirs. Exhibiting of their disease-inciting power for fishes is connected with changes of some parameters of inhabitancy and characteristics of the fish population state. Molecular- genetic methods on the basis of polymerase chain reaction allow to determine correctly a compound of microflora causing and accompanying infectious diseases of fishes. Molecular-genetic identification of the contagious agents who have become the reason of «aeromonosis» in the population of perch Perca fluviatilis in lake Arahley (Zabaikalskiy Kray) in 2009 is lead. Genotypes of bacteria of genuses Aeromonas and Flavobacterium are detected, and also representatives of genus Saprolegnia, is confirmed complex etiology of perch diseases. Kinds of main indicatory microorganisms for monitoring the state of inhabitancy and infectious diseases of fishes in lakes of Zabaikalye are offered.