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Lake Baikal in Eastern Siberia is the deepest and one of the largest and most ancient lakes in the world. However, even in the deepest regions, oxygenation levels do not fall below 75–80% of the surface levels. This has enabled a remarkable flock of largely endemic teleost fish of the sub-orderCottoidei to colonize all depth habitats. We have previously shown that species that occupy progressively...
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