Diversity of conditionally pathogenic microorganisms in fish industry facilities in Karelia | Условно-патогенная микрофлора в рыбоводных хозяйствах Карелии
2010
Sidorova, N.A., Petrozavodsk State Univ. (Russian Federation) | Parshukov, A.N., Russian Academy of Sciences, Petrozavodsk (Russian Federation). Karelian Research Centre. Inst. of Biology
Bioproduction in lakes with fish farming and water quality depend on the structure and operation of the aquatic ecosystem. A crucial role in a lake is played by microorganisms. They participate in the processes of self-purification, enrich the environment with useful elements, have the highest rate of reproduction, and control the biomass of all elements of the food chain. Upsetting the steady state condition of the natural surroundings, industrial-scope aquaculture negatively influences the water-body and its inhabitants. As the type of microorganisms changes, bacteria become more virulent, and there forms a complex of conditionally pathogenic bacteria, which induces development of fish infections. Karelia has a vast network of trout farms using fish cages, and the problems mentioned above are highly topical today. Microbiological screening, which helps reveal patterns in the distribution of aquatic microbial flora and normal flora in trout, was organized in several water-bodies with fish farms in Karelia. Quantitative parameters of microorganisms were found to change over years and seasons due to a substantial increase in allochthonous organic matter in fish cage area. Heterotrophic organisms constituted the bulk of the bacterial biomass. The dominant genera among them were Moraxella, Seratia, Escherichia, Pseudomonas, Acinetobacter, Enterobacter. These bacteria predetermined the ecological and epizootic situation in the water-bodies surveyed
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