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Total sturgeon catch in the Caspian

Total sturgeon catch in the Caspian

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Uploaded 09 Oct 2013 by GRID-Arendal
Year: 2013 Author: GRID-Arendal
Description:
Six sturgeon species are found in the Caspian Sea and its drainage basin: Russian sturgeon (Acipenser gueldenstaedtii), Persian sturgeon (A. persicus), Stellate sturgeon (A. stellatus), Ship sturgeon (A. nudiventris), Sterlet (Acipenser ruthenus) and Beluga (Huso huso). The bulk of the world’s remaining stock of wild sturgeon resources is found in the Caspian, which also accounted in the past for between 80 and 90 per cent of total world caviar production. Since 1970, pollution from various sources, mainly from industry and agriculture in surrounding areas plus oil extraction activities, has had a major impact on the Caspian Basin and its ecosystems. Accumulations of various toxins in the main rivers surrounding the Caspian and in the sea itself have led to changes in the physiology and reproductive systems of sturgeon. In the period from 1985 to 1990, sturgeon dieoffs were recorded in the Volga and Ural rivers (Ivanov 2000). Up to 90% of sturgeon specimens examined showed musc ...
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