| Abstract [eng] |
The aim of this work was to determine influence of intensive fish farming on the change in the composition of microorganism communities. 18 sediment samples were collected from Simnas fishing ponds. After metagenomic analysis, the largest populations of microorganisms and differences in bacterial communities in pond groups were identified. The ecological status of ponds in the context of bacterial communities was also assessed. Bacterial diversity was found to be similar in different Simnas fishing ponds. The predominant microorganisms in the sediment belonged to Proteobacteria phylum (45.7–69.8%). Examination of the structure of the microorganism classes revealed that the dominant type of Proteobacteria in all samples consisted of Alfaproteobacteria, Betaproteobacteria, Gammaproteobacteria and Deltaproteobacteria. The structure of bacterial communities was similar in both samples and their groups, except Sim2B and Sim2S groups were characterized by a high Cyanobacteria abundance. The ecological status of Simnas fishing ponds was determined. High abundance of Deltaproteobacteria and Gammaproteobacteria indicated organic matter contamination in Simnas fishing ponds, and increased levels of Cyanobacteria in the Sim2B and Sim2S pond groups indicated that these ponds are eutrophicated. Pathogenic bacteria belonging to the genera Listeria, Bacillus and Pseudomonas have also been identified in the Simnas fishing ponds. |
