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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 ?
Specifically, we compared the nektonic organisms collected on a reef plot with those collected on an adjacent control plot (i.
Between the deployment of the oyster castles and the initiation of sampling, oysters recruited to this substrate at high densities, thereby presenting complex biogenie reef habitat for utilization by nektonic organisms.
At high tide, trigger lines equipped with cotter pins that held the net within the brackets were used to release the weighted bottom of the net, allowing it to drop to the sediment and completely encircle the nektonic organisms within each plot.
This ensured that sites would be completely exposed during low tide, maximizing the ability to collect all the nektonic organisms as the tide receded.
6 m within each plot, dip netting for nektonic organisms began.
Nektonic faunal assemblages were compared among sites and between treatments using cluster analysis (Community Analysis Program IV; Pisces Conservation Ltd.
A total of 12,161 nektonic organisms were collected, including 5,004 from FR, 4,326 from FJ, and 2,831 from ICW.
More mobile and larger nektonic prey, such as cephalopods and young fish, are able to avoid conventional plankton nets, with the consequence that electivity indices for these prey types would be biased upward.
pteropus was not an important and available nektonic prey organism at the time of sampling.
Ecological mechanisms related to intraspecific structure of the nektonic squid Sthenoteuthis pteropus (Steenstrup).
A study of nektonic and benthic faunas of the shallow Gulf of Mexico off the state of Mississippi as related to some physical, chemical and geological factors.
edwardsii and suggested the use of PL as a storage medium in the puerulus may be related to its characteristic transparency, an important feature of this nektonic stage that is highly vulnerable to pelagic visual predators.