Answer: nekton

AnswerCrossword Clue
NEKTONRelative of plankton.
NEKTONMarine life in toto
NEKTONFree-swimming aquatic life
NEKTONMarine organisms
nektonfree-swimming marine animals
nektonfree-swimming aquatic animals essentially independent of wave and current action
nektonthe aggregate of actively swimming aquatic organisms in a body of water, able to move independently of water currents