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the influence of biotic and abiotic factors influencing the composition of fish communities of waterways;

- the interactions between alien and native fish species;
- the reproductive biology, growth and feeding of freshwater fish species;
• the population structure and demography of freshwater fish species;
• the definition of indices of structure and parameters allowing the determination of standard conditions of growth of freshwater fish species;
• the determination of the standard weight equations to estimate relative weight of freshwater fish species.