Nekton Definition
 nĕktən, -tŏn 
    noun
  
 The larger, aquatic, free-swimming animal life having movements that are largely independent of currents and waves, including squids, fishes, and whales.
 Webster's New World 
Origin of Nekton
-  
Greek nēkton neuter of nēktos swimming from nēkhein to swim snā- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 Coined in 1890 by Ernst Haeckel, from Greek νηκτόν (nēktón), "the swimming". (See Wikipedia.)
From Wiktionary
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