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nekton

collective name for free-swimming aquatic creatures, 1893, from German nekton (van Heusen, 1890), from Greek nekton, neuter of nektos "swimming," from nekhein "to swim" (from PIE root *sna- "to swim"). Compare plankton.

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Definitions of nekton from WordNet

nekton (n.)
the aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales;
From wordnet.princeton.edu