ABSTRACT
The researches were carried out in the Zaporizhian reservoir (Ukraine) in the spring-summer period of 2015 – 2016. The samples were taken in two sections of the Zaporizhian reservoir which differ in ecological and hydrological regime: the Samara Bay (characterized by high content of heavy metals and high water mineralization) and the lower section of the reservoir (conventionally “clean zone”). The four-year-old specimens of both breeds of the Bream (Abramis brama Linnaeus, 1758) were the objects of the research. The fish were caught using gill nests during research fishing. The following indices of red blood cells were determined: large longitudinal and small transverse diameters of mature erythrocytes and their nuclei, erythrocyte area, erythrocyte core area. The volume of the cell, including the volume of the nucleus, was determined by the Houchin equation. It was established that in the the Bream from the Samara Bay an increase in the areas and volumes of fish red blood cells was observed compared to the same age species from the lower part of the reservoir. In erythrocytes of the researched fish, the following pathologies were observed: poikilocytosis, festonchity of the membrane, hyperchromia of the nucleus, anatomic location of the nucleus, amitose, invagination of the nucleus, nuclear shadows. The most pathologies were found in the Samara Bay, which sufferes from more intensive anthropogenic influences.
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