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Related to nektonic: planktonic, Infaunal, Epifaunal


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 ?
Larvae of Aciliini are usually characterized as nektonic predators of plankton.
Subsequently I sampled midges, nektonic invertebrates, and large and small fish in each of the 42 mesocosms, as described above, on a 5-wk rotating schedule (13-17 June, 18-22 July, and 22-26 August 1994).
This study examined the effects of aquaculture practices for the hard clam Mercenaria mercenaria on the ecology of shallow-water habitats, specifically, the seasonal distribution, abundance, biomass, species richness, and community composition of nektonic, demersal, epibenthic, and infaunal organisms in cultivated and uncultivated shallow-water habitats in Virginia and New Jersey.
Tidal marshes as energy sources for commercially important nektonic organisms: stable isotope analysis.
Insectivory seems to be common to most stream fishes both for those with diurnal or nocturnal habits and also for those benthic or nektonic.
Observation of the vertical distribution and behavior of nektonic squids using manned submersibles.
As a result from the ramp morphology and controlled by regional tectonics and sea level changes, the thickness of these units increases towards the west, which are biostratigraphically well constrained due to the abundance of benthic and nektonic fauna, namely ammonites and calcareous nannofossils (Silva et al.
The life cycle of most nektonic cephalopod species starts with planktonic stages called "paralarvae" (Young & Harman, 1988).
Larvae of Thermonectus (tribe Acillini) are characterized as nektonic predators of zooplankton.