The estimation of the fingerling number of Russian sturgeon in the North-Western part of the Caspian Sea
2019
Lepilina, I.N. | Bulgakova, T.I.
The analysis of the spatial distribution of fingerlings in the waters of the North-Western Caspian was carried out on base of 2015–2018 trawl surveys. The spatial distributions of the Russian sturgeon fingering maps were drawn and compared for 4 years. The regions where the Russian sturgeon fingerlings feed the most mass were marked. The number and the spatial distribution of fingerlings were determined in two ways: 2D spline approximation and the Voronov’s polygon method. Both methods are included in the program “Cartmaster” developed by FSBSI “VNIRO”. The fingerling number estimates in the study area fell in the range from 2.479 to 5.490 million specimen, which corresponds to 8–15 % of the number of juveniles released from sturgeon hatcheries in 2015–2018. The results are used as base for predicting the stock recruitment and for estimating the contribution of sturgeon hatcheries to replenishing the Russian sturgeon population
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