DEVELOPMENT OF THE GONADS OF BREAMS (ABRAMIS BRAMA LINNAEUS, 1758)
IN THE ZAPOROZHSKOE RESERVOIR CONDITIONS

Marenkov Oleg Nikolaevich, Assistant, sub-department of general biology and water bioresources,
Dnepropetrovsk National University named after Oles Gonchar
(72 Gagarina street, Dnepropetrovsk, Ukraine),gidrobs@yandex.ru
Fedonenko Elena Viktorovna, Doctor of biological sciences, professor, head of sub-department of general biology and water bioresources, Dnepropetrovsk National University named after Oles Gonchar
(72 Gagarina street, Dnepropetrovsk, Ukraine), hydro-dnu@mail.ru
Gabibov Magomed Magomedovich, Doctor of biological sciences, professor, head of sub-department of anatomy, histology, physiology, Dagestan State University
(43a M. Gadzhieva street, Makhachkala, Russia), phiziolog1@yandex.ru
Abdullaeva Naida Murtazalievna, Candidate of biological sciences, associate professor, sub-department of anatomy, histology, physiology, Dagestan State University
(43a M. Gadzhieva street, Makhachkala, Russia), caca1@yandex.ru

597.554.3

Background. Fish fauna of the Zaporozhskoe Reservoir are under the considerable anthropogenic loading, which causes abnormal development of fish eggs. The purpose of the article is to study the modern state of processes of recreation of breams of the Zaporozhskoe Reservoir in the conditions of anthropogenic loading.
Materials and methods. The material for the research were puberal individuals of breams (A. brama Linnaeus, 1758). To study the reproductive potential of a population of bream the authors collected ovaries of females at different stages of maturity. Investigations were carried out using standard ichthyological, histological and statistical methods.
Results. The researchers analyzed the current state of the spawning population of breams in the Zaporozhskoe Reservoir. Populations of bream have a limited age range and are represented by individuals from 3 to 12 years. In the spawning population of breams the authors marked the predominance of males over the number of females. Individual absolute fecundity of breams from different age groups ranged from 54.3 to 264.3 thousand eggs with an average of 148.2 thousand eggs. Local population of breams in the Samara Bay significantly lags behind in growth compared with breams from lower part of the Zaporozhian Reservoir. The authors conducted histological analysis of the gonads of breams at different stages of gonadogenesis and established asynchronous development of oocytes.
Conclusions. The imbalance in the sex structure of the population of breams may be due to adverse natural processes that occur in the waters of the Zaporozhskoe Reservoir. Differences in growth and development of breams from different parts of the reservoir are the result of physiological changes in the body of fish associated with the complex influence of factors of anthropogenic pollution. In the process of bream female’s gonads maturation in the Zaporozhskoe Reservoir the development of oocytes occurs asynchronously, which is likely due to the influence of hydro-ecolo¬gical conditions (temperature and level regime) in summer.

gonadogenesis, gametogenesis, Zaporozhskoe Reservoir, bream, individual absolute fecundity, gonadosomatic index, oocytes.

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