Danube an important industry. The Upper Danube ecoregion alone has about 60 fish species and the Lower Danube–Dniester ecoregion has about twice as many. Among these are an exceptionally high diversity of sturgeon, a total of six species (beluga, Russian sturgeon, bastard sturgeon, sterlet, starry sturgeon and European sea sturgeon), but these are all threatened and have largely–or entirely in the case of the European sea sturgeon–disappeared from the river. The huchen, one of the largest species of salmon, is endemic to the Danube basin, but has been introduced elsewhere by humans. Important tourist and natural spots along the Danube include
The Crab and the Fox their familiar pursuits and take up a business they know nothing about”. The fable appeared in the Medici manuscript in the 15th century and later among those recorded by Roger L'Estrange (1692). In Victorian times the story appeared in George Fyler Townsend’s new translation with the moral “Contentment with our lot is an element of happiness”. Crabs are not a natural food for foxes but anciently they were confused with crayfish and there is a freshwater species of crayfish that is eaten by foxes in the Balkan Danube region. There is in addition a South American Crab-eating Fox about which