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The opossum shrimp (Mysis relicta) is a holarctic planktivore that undergoes diel vertical migration (DVM), ascending at night from deeper water or the lake bottom into the upper water column to feed. In deep lakes that thermally stratify, M. relicta spends most of the time on or near the lake bottom in cold water where food resources are low; but, M. relicta migrates daily into warmer layers to feed...
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