Abstract and keywords
Abstract (English):
Until the end of the XX century, anchovy sprat was the leading object of marine fishing in the Caspian Sea. At the beginning of the XXI century, there was a mass death of this species, as well as an outbreak of the number of mnemiopsis comb - a powerful consumer of feed zooplankton. There was a redistribution of keel clusters in the sea. The main part of the fishing stock of keels began to be distributed in the Middle Caspian Sea. The main object of marine fishing has become an ordinary sprat. In recent years (2015-2020), there has been an increase in the number of anchovy sprats. The materials of keel surveys also confirm the annual growth in the number of juvenile sprats. This paper presents the results of recent years of observations, shows the dynamics of the number and biomass of the population, the parent part of the herd, total fertility. The efficiency of spawning and the survival coefficients of the generation in early ontogenesis are shown. Environmental factors that have a direct impact on the formation of the anchovy sprat stock are described.

anchovy sprat, commercial stock, number of females, reproduction efficiency, comb-mnemiopsis, comb-beroe

1. Sedov S.I. On the death of sprats in the Middle and Southern Caspian Sea in 2001 / Yu.A. Paritsky, G.G. Kolosyuk, S.V. Kanatyev // Rybohoz. research. on the Caspian Sea. Research results for 2001. KaspNIRKh. - Astrakhan, 2002 – Pp. 340-346.

2. Katunin D.N. The impulse of hydrovulcanism in the Derbent basin of the Middle Caspian, as a possible factor in the large-scale death of anchovy and big-eyed keels in the spring of 2001 / B.N. Golubov, D.V. Kashin // Fisheries research in the Caspian: Research results for 2001. Astrakhan: KaspNIRKh Publishing House, 2002. – Pp. 41-55.

3. Kamakin A.M. Features of the formation of populations of the alien Mnemiopsis leidyi (A. Agassiz) (Ctenophora: Lobata) in the Caspian Sea. - Autoref. diss.... cand. biol. sciences. – Astrakhan, 2005. - 23 p.

4. Sudakov G.A. Instructions for the collection and primary processing of materials of aquatic biological resources of the Caspian basin and their habitat. Astrakhan: KaspNIRKh Publishing House, 2011. – 351 p.

5. Riker U.E. Methods of assessment and interpretation of biological indicators of fish populations. // Trans. from English - M.: Food. prom., 1979 – 408 p.

6. Paritsky Yu.A. Reproduction, development and formation of the number of generations of anchovy sprat: abstract of the dissertation for the degree of Candidate of Sciences. biol. nauk. – M., 1983. – 20 p.

7. Prikhodko B.I. Ecological features of Caspian keels // Questions of ichthyology. – 1979. – issue 5 (118). – Pp. 801-812.

8. Riker U.E. Methods of assessment and interpretation of biological indicators of fish populations Per. from English. – M.: Food. prom., 1979 – 408 p.

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