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In page Sea of Azov:

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Another traditional activity in the sea is fishing. The Sea of Azov used to be the most productive fishing area in the Soviet Union: typical annual fish catches of 300,000 tonnes converted to 80 kg per hectare of surface. (The corresponding numbers are 2 kg in the Black Sea and 0.5 kilograms (1.1 lb) in the Mediterranean Sea.)[citation needed] The catch has decreased in the 21st century, with more emphasis now on fish farming, especially of sturgeon.