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see marine biologymarine biology,
study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or benthic. Nektonic animals are those that swim and migrate freely, e.g.
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the division of the pelagic population that comprises the free-swimming animals. Nekton are capable of withstanding the force of the ocean current and are able to travel over long distances. Fish, squids, cetaceans, pinnipeds, sea snakes, turtles, and penguins constitute the nekton group. A streamlined body shape and a well-developed locomotory apparatus are characteristic of nekton.

In complete contrast to the nekton are the plankton, which are helplessly carried by the ocean currents. The micronekton, represented by animals capable of limited active locomotion, occupy an intermediate position between the plankton and nekton. The micronekton include fry and small species of fish and squids, the larger members of the suborder Natantia, and the euphausiids.


(invertebrate zoology)
Free-swimming aquatic animals, essentially independent of water movements.
References in periodicals archive ?
An analysis of nekton and plankton around a shoalgrass bed in the Laguna Madre of Texas.
Nekton, a set of four interlocking low stools by Zaha Hadid for Established & Sons.
D'Or specializes in squid and got involved in the project at a meeting unpoetically titled "Nonfish Nekton," or animals that aren't fish but can still swim better than plankton.
Processes regulating habitat use by salt marsh nekton in a southern New Jersey estuary.
They used the commercial software package NEKTON to solve the transient problem.
Plants and animals arrive as plankton (drifters), nekton (free-swimming), fouling organisms (attached inside and on the hulls, propellers, and intake systems of vessels), and benthos (bottom dwellers).
White whales (also called beluga, or belukha, whales) catch nekton with monodont teeth (Stewart and Stewart, 1989).
The bases of the pelagic system: plankton, nekton and pleuston
(2.) Kannel WB, Nekton JD, Wentworth D, Thomas HE, Stamler J, Hulley SB, Kjelsberg MO, for the MRFIT Research Group.
On average, collections were made every 3-4 d for phytoplankton and zoo-plankton, 7 d for benthos, and 10-14 d for nekton (fish and swimming benthic invertebrates).