
1) Being 2) Free-swimming aquatic life 3) Marine life in toto 4) Marine organisms 5) Organism
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https://www.crosswordclues.com/clue/nekton

Nekton refers to the aggregate of actively swimming aquatic organisms in a body of water (usually oceans or lakes) able to move independently of water currents. Nekton can be contrasted with plankton, which refers to the aggregate of passively floating, drifting, or somewhat motile organisms present in a body of water, primarily tiny algae and bac...
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http://en.wikipedia.org/wiki/Nekton

assemblage of swimming organisms in a body of water
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http://phrontistery.info/n.html

the assemblage of pelagic animals that swim freely, independent of water motion or wind. Only three phyla are represented by adult forms. Chordate ... [5 related articles]
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http://www.britannica.com/eb/a-z/n/23

free-swimming animals that control their own direction in the water column, such as fish. See plankton and benthos.
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http://www.coml.org/edu/glossary/g1.htm

(Gk: nekho to swim; nektos swimming) animals that swim actively in the water, including fishes and whales. Free swimming plankton organisms like krill, are called either micronekton or macrozooplankton.
Found on
http://www.seafriends.org.nz/books/glossary.htm

[
n] - the aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales
Found on
http://www.webdictionary.co.uk/definition.php?query=nekton

nekton 1. Animals of the pelagic zone of a sea, or lake, that are free-swimming and independent of tides, currents, and waves; such as, fish, whales, squid, crabs, and shrimps. 2. Nekton swim and are not simply carried passively by currents. Nekton are limited in distribution by temperature and nutrient supplies, and they decrease with the increa...
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http://www.wordinfo.info/words/index/info/view_unit/1379/2

Organisms with swimming abilities that permit them to move actively through the water column and to move against currents
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https://www.encyclo.co.uk/local/20125
noun the aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales
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https://www.encyclo.co.uk/local/20974

the aggregate of actively swimming aquatic organisms in a body of water, able to move independently of water currents.
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https://www.infoplease.com/dictionary/nekton
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