Nekton is a group of aquatic animals that move actively in the water column and can move independently over long distances, as well as to withstand the force of the currents. So for nektonic animals characteristic rounded shape and well-developed organs of movement.
The nekton include fish, squid, adult cephalopods, water snakes, sea turtles, penguins and marine mammals - cetaceans, pinnipeds, seals.
The term "nekton" introduced in 1890 by the German biologist Ernst Haeckel (Ernst Haeckel). The word "nekton" comes from the Greek nektos, meaning "floating, floating".