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Underwater Danube delta, Romania

Image 18 of 387
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The Russian sturgeon (Acipenser gueldenstaedtii). Captive (Image shot in aquarium) in Danube Delta Eco Tourism Museum Center, Tulcea, Romania. DIGITALLY CLEANED.<br />
Also known as the diamond sturgeon or Danube sturgeon. Russian sturgeon reproduce slowly, making them highly vulnerable to fishing. 2006 IUCN Red List of Threatened Species.