ASSESSMENT OF AQUABIOLOGICAL RESOURCES IN THE BASINS OF THE ALTAI TERRITORY

The paper highlights the results of complex ichthyological research for many-years period. The authors consider the factors that influence the age and size composition and reproduction of aquabiological resources on the example of common pike (Esox lucius Linnaeus, 1758) and silver carp (Carassius auratus (Linnaeus, 1758)). The paper calculates possible fish yield. The authors found out that sport fishing and IUU fishing in water basins changes the structure of ichthyofauna. Low-value species are rapidly increasing the number of commercial herds. The number of valuable fish species is not stable as it is determined by withdrawal and abiotic factors. The researchers didn’t observe the cases of infection by opisthorchiasis and difillobotrioz in the explored water basins. The concentration of heavy metals in the muscle tissue of fish is mostly low, lower or substantially lower than permissible concentrations of heavy metals in fresh fish products in Russia. However, there is a number of exceptions. The authors investigated the Sandy lake and observed high concentration of lead in the tissues of the fish. The concentration of cadmium and mercury in the Ob within the boundaries of the Kamenka district is relatively high (but not higher than permissible concentration level).

aquabiological resources, assessment of fish stock, monitoring, environmental safety, ichtyopathological welfare

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