The Quietschbükers is found only in the one lake - Lake Breiter Luzin in Germany. It suffered a population decline in the 1970s, when the lake became degraded and eutrophic, rich in nutrients and thus plant life, that consumed much of the oxygen. However, with water quality restoration, the numbers of this dwarf whitefish have improved. She lives for six years, spending much of her time in the deeper reaches of the lake, where she feeds on insect larvae. In spring/summer, she moves into the shallows to spawn. Although there are no current threats to her population, due to its confined nature and the risks of introduced predators, she is classified as Vulnerable to extinction.
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