ネクトンネクトンMeanings1nounnektonBiological term for aquatic animals that can swim actively against currents, such as fish, squid, and marine mammals. Contrasts with plankton.ネクトンには魚さかなやイカ、クジラなどが含ふくまれる。Nekton includes fish, squid, whales, and other actively swimming organisms.