Baltic Population
Recent studies have shown that the now extinct sturgeon population in the Baltic Sea belonged to the Atlantic sturgeon subspecies rather than to the European variant (A. sturio) as previously thought. The research indicates that this species migrated to the Baltic about 1300 years ago and subsequently displaced the native species.
Because of overfishing and pollution, however, the Atlantic sturgeon was extirpated from the Baltic sea in the beginning of the 20th century. A German-Polish project is now (2009) underway to re-introduce the sturgeon into the Baltic by releasing specimens caught in the Canadian Saint John river into the Oder, a river at the border between Germany and Poland where the species once spawned.
Read more about this topic: Atlantic Sturgeon
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