Spectators enjoying the Russian sturgeon (Acipenser gueldenstaedtii) in an aquarium in Tulcea. Captive (Image shot in aquarium) in Danube Delta Eco Tourism Museum Center, Tulcea, Romania.
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.