The live animals, Neuston refers to float on the water surface, such as a kangaroo, water. Nekton refers to animals that swim back and forth freely, and can swim like fish and turtles swam.
Neuston means live animals floating on the water surface as gerridae Nekton. Refers to animals that swim freely. And be able to swim against the tide, such as turtles, fish.
Neuston mean creatures that live on the surface of floating water such as water Striders Nekton mean animals swim environment around freely. And can be swimming against the current, such as turtles, fish.