Sterlet Sterlet The sterlet ("Acipenser ruthenus") is a relatively small species of sturgeon from Eurasia native to large rivers that flow into the Black Sea, Azov Sea, and Caspian Sea, as well as rivers in Siberia as far east as Yenisei. Populations migrating between fresh and salt water (anadromous) have been extirpated. Due to overfishing (for its flesh, caviar, and isinglass), pollution, and dams, the sterlet has declined throughout its native range and is considered vulnerable by the IUCN. Restocking projects are ongoing, and it has been introduced to some regions outside its native range, but the latter have generally not
The Types of the Scandinavian Medieval Ballad differences of the variants of the ballad and how they differ, and comprises a list of appearances in various Nordic ballad collections. Almost all of the ballad types given in the Danish (DgF), Faroese (CCF), Icelandic (IFkv), or Swedish (SMB) ballad type listings also have a specific TSB type listing. (The exceptions are a few texts, which now are known to be of rather recent origin, or are otherwise found to be deficient.) Norsk visearkiv, which is responsible for the corresponding Norwegian ballad project, has decided to employ the TSB classification directly. Many Scandinavian ballad types are also easily recognised