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- The Sommen charr (Swedish: Sommenröding) is a population or subspecies of Arctic charr found in Lake Sommen. It is one of twenty-two species of fish found in the lake. This population and other Arctic charrs in southern Sweden are regarded as relict populations at the southern edge of the natural distribution of Arctic charrs. Survival of Arctic charrs at the southern edge of their natural range is explained by Lake Sommens having a great depth (53 metres (174 ft)) with cold and oxygen-rich bottom waters. Sommen charr may also draw benefits from the lake's richness in fish species and the complex ecology it implies. Populations of Sommen charr declined over the 20th century, leading to the fish being declared endangered in 1970. The causes of the decline are likely to include overfishing, fishing of immature individuals, unnatural lake level changes (as the lake is regulated), and competition from introduced species. The largest known Sommen charr weighed almost 9 kilograms (20 lb), and was for a while the largest Arctic charr fished in Sweden. The three largest arms of Sommen, Tranåsfjärden, Asbyfjärden and Norra Vifjärden, host most of the Sommen charr population. Lek locations lie chiefly along the eastern shores of Norravifjärden and around Malexander in the north-central parts of the lake. Studies have shown that the substrate in most lek places is bedrock, boulders, gravel and pebbles while only a minority are on sand. Other nearby populations of Arctic charr are found in the lakes Vättern, and . In Drögen, 10 km to the northeast of Sommen, Arctic charr is considered to have gone extinct. (en)
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- The Sommen charr (Swedish: Sommenröding) is a population or subspecies of Arctic charr found in Lake Sommen. It is one of twenty-two species of fish found in the lake. This population and other Arctic charrs in southern Sweden are regarded as relict populations at the southern edge of the natural distribution of Arctic charrs. Survival of Arctic charrs at the southern edge of their natural range is explained by Lake Sommens having a great depth (53 metres (174 ft)) with cold and oxygen-rich bottom waters. Sommen charr may also draw benefits from the lake's richness in fish species and the complex ecology it implies. (en)
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