The state of freshwater fish populations under conditions of multifactorial anthropogenic load

In recent decades, an increasing number of freshwater reservoirs are subjected to multifactorial anthropogenic effects, which leads to a number of chronic effects in fish populations. In the present work, an assessment of the occurrence of developmental abnormalities in populations of four species of freshwater fish (Alburnus alburnus, Esox lucius, Perca fluviatilis, Rutilus rutilus) living in reservoirs with different levels of anthropogenic pollution was carried out. The spectrum of impairments and malformation in development, as well as the sensitivity of various periods of ontogenesis to the action of pollutants, are analyzed. Age differences in the occurrence of abnormalities in the studied fish’s samples are shown.