NATURAL SCIENCES

Journal of fundamental
and
applied researches

The features of the distribution, the estimate of qualitative and quantitative composition of ichthyoplankton in the shallow-water part of the Northern Caspian Sea in summer 2013

2015. №1, pp. 15-19

Gutculyak Svetlana A. - graduate student, Astrakhan State University, 1 Shaumyana Sq., Astrakhan, 414000, Russian Federation, gutculiak@mail.ru

Lozovskaya Marina V. - D.Sc. (Biology), Professor, Head of Chaire, Astrakhan State University, 1 Shaumyana Sq., Astrakhan, 414000, Russian Federation, moryana12@mail.ru

Smirnova Natalya V. - Ph.D. (Biology), Associate Professor, Astrakhan State University, 1 Shaumyana Sq., Astrakhan, 414000, Russian Federation

The work presents the material on the distribution, concentration and species composition of young fish at the early stage of ontogenesis (prolarva, larva and alevin periods). You can see comparative characteristics of ichthyoplankton in the summer months. Juvenile fish in the catches for the period of the researches were met at all stages of development from prolarva to alevin. The main mass was on the larval stages of development, early larvae dominated in Jun, late larvae and alevins dominated in July. The main concentrations were formed in the Western part of under consideration water area at the zones which are adjoined to the Main bank. In the distribution of marine fish species the species spatio-temporal isolation was established, which was expressed in terms of the emergence of juvenile fish and quantitative indicators. The occurrence of juvenile fish in the early stages of ontogenesis (prolarva, larva and alevin periods) in June-July, indicates to the stretching of the spawning and constant replenishment of the population.

Key words: ихтиопланктон, распределение, концентрации, личинка, малек, Каспийское море, плотность скоплений, обыкновенная килька, атерина, количественные показатели, ichthyoplankton, distribution, concentration, alevin, the Caspian Sea, the density of clusters, anch