Abstract
Catches for the last 25 years are analyzed for beluga Huso huso, stellate sturgeon A. stellatus and Russian sturgeon Acipenser gueldenstaedtii, which are the three commercially important species of sturgeons found in the Caspian Sea Basin. Population sizes for generations born between 1961 and 1970 are estimated, and found to depend on natural reproduction and the number of young fish stocked annually from sturgeon hatcheries located in the Volga River Delta. A ban on sea fishing from 1962 to 1991 positively impacted the number and total biomass of commercial stocks. Sturgeon growth rates depend on water levels in the Caspian Sea. In order to preserve Caspian Sea sturgeon populations, it will be necessary to coordinate efforts of all countries surrounding the Caspian Sea to achieve rational harvests, preserve juveniles, and produce at least 100 million juveniles annually from hatcheries.
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Khodorevskaya, R.P., Dovgopol, G.F., Zhuravleva, O.L. et al. Present status of commercial stocks of sturgeons in the Caspian Sea basin. Environmental Biology of Fishes 48, 209–219 (1997). https://doi.org/10.1023/A:1007381418332
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DOI: https://doi.org/10.1023/A:1007381418332