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
Velvet crab Velvet crab The velvet crab is alternately "velvet swimming crab", "devil crab" or "lady crab," Necora puber, is a species of crab. It is the largest of the swimming crab family (Portunidae) found in British coastal waters. It has a carapace width of up to , and is the only species in the genus Necora. Its body is coated with short hairs, giving the animal a velvety texture, hence the common name. It is one of the major crab species for United Kingdom fisheries, in spite of its relatively small size. The velvet crab lives from southern Norway to Western