Features of the spatial distribution of the Caspian sprats in the middle part of the Caspian Sea in the summer period according to the results of sonar studies
https://doi.org/10.36038/2307-3497-2021-184-87-98
Abstract
Studies of the distribution density and assessment of the biomass of Caspian sprats in the deep-water part of the Middle Caspian Sea were carried out at the NIS “ Issledovatel Caspia “by the EK‑60 hydroacoustic complex of the company” Simrad “(Norway) with permanently installed split-beam antennas at 38 and 120 kHz. The assessment of the biomass of Caspian sprats was carried out in the course of hydroacoustic survey on a pre-planned grid of tacks over depths from 20 to 800 m. Surveys on the registration of Caspian sprats, conducted in the summer period (June-July) from 2015 to 2018, showed that the largest mass of Caspian sprats, making feeding migrations, is concentrated in the middle part of the Caspian Sea, above depths from 100 to 700 meters. Based on the results of the 2015–2018 summer hydroacoustic surveys, maps of the distribution of sprats in the middle part of the Caspian Sea were constructed. The maximum concentrations of adult sprats in the upper layer of 0–10 m were observed only in the western part of the Middle Caspian Sea. In the 10–20 m layer, dense clusters were found both in the western, eastern, and central parts of the water area. Based on the results of the research, recommendations were developed for the fishing fleet on the resumption of sprats fishing by trawl in the middle part of the Caspian Sea.
About the Authors
T. V. Pomogaeva
Russian Federal Research Institute of Fisheries and Oceanography (VNIRO)
Russian Federation
Russian Federation
Moscow
V. A. Tatarnikov
Russian Federal Research Institute of Fisheries and Oceanography (VNIRO)
Russian Federation
Russian Federation
Moscow
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Review
For citations:
Pomogaeva T.V., Tatarnikov V.A. Features of the spatial distribution of the Caspian sprats in the middle part of the Caspian Sea in the summer period according to the results of sonar studies. Trudy VNIRO. 2021;184:87-98. (In Russ.) https://doi.org/10.36038/2307-3497-2021-184-87-98
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