Fedonenko O. The anthropogenic factors impact on the industrial ichtyofauna state in the Zaporozhian Reservoir

In dissertation work it had been explored the modern state and conformities of the Zaporozhian Reservoir ecosystem transformation at the whole existence. It had beed defined and scientifically grounded the main pecularities of the industrial ichtyofauna forming and development under impact of the anthropogenic factors (chemical contamination, anthropogenic eutrphication). The water quality at lower area of the Zaporozhian Reservoir was qualified as III class, and 5 category (moderately dirty), water quality at the Samara bay - as V class, and 7 cathegory (very dirty). The heavy metal contents in the various fish species depends on their trophycity, biotop and physiology state. The highest levels of the heavy metals contents were indicated at the 3-4-years individuals of the European carp from the Samara bay. The biochemical adaptation mechanism study and correlation analysis resulted in the indication of cadmium, iron, lead, nickel, mercury as most toxic elements for predatory fishes; manganese, zinc and copper additionally showed a considerable toxic effects for peaceful fishes. The peaceful fishes had been exposed intensively to the toxicants in comparison to predatory ones. Ecological description of the main industrial fish populations in the Zaporozhian Reservoir showed that both scuttle-butt and European carp silver became up dominant species (according to 30 % and 20 % in catches). Тhe European carp had been shown as the here most ecologically adapted specy, its productivity growed more than in 5 times for the last 10 years.