NATURAL SCIENCES

Journal of fundamental
and
applied researches

Peculiarity of bream Abramis brama (Linnaeus, 1758) distribution in the Northern Caspian sea in the modern period

2013. №3, pp. 33-51

Levashina Natalya V. - Senior Researcher, Caspian Research Institute of Fisheries, 1 Savushkin Str., Astrakhan, 414056, Russian Federation, kaspiy-info@mail.ru

In this paper we analyzed the distribution of bream in the feeding period in the waters of the northern part of the Caspian Sea, in connection with a reduction in their numbers. It is defined its range of feeding and the distribution of bream in the surveyed area, depending on the depth, salinity, temperature and water clarity. It is shown the number of bream in the autumn in the northern part of the Caspian Sea. The analysis of the size-weight, age and sex composition of sea bream is made. The attention is drawn to the change rate of growth and weight gain in different periods of research. There is a decrease of quality indicators of bream in the modern period, which is typical for adverse feeding conditions for marine pastures.

Key words: bream Abramis brama (Linnaeus 1758),size,population,the northern part of the Caspian Sea,linear growth,weight growth