Ossetra dwells another type of sturgeon, Siberian sturgeon ("Acipenser Baerii"), which is farmed all over the world because it can adapt to a wider range of habitats. It begins to produce caviar faster than "Acipenser gueldenstaedtii". Throughout the entire history of black caviar consumption, reference to Ossetra was made only to the fish that was caught first in Imperial Russia, then the USSR, and now in the Russian Federation. Today, Caspian Ossetra is facing extinction in its native habitat. Farming sturgeon is the only way to continue the production of high-quality caviar. Continuous drastic declines in natural sturgeon populations over the
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