noun
Technical term in marine biology for aquatic animals that can swim actively against currents, as opposed to plankton.
遊泳生物には魚類やイカ類が含まれる。
Nekton includes fish and squid.
Plankton are organisms that drift with currents, while nekton (遊泳生物) can swim independently.
Compound of 遊泳 (swimming) and 生物 (organism), a direct translation of the English term 'nekton'.