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The small or microscopic organisms that drift or swim weakly in a body of water, including bacteria, diatoms, jellyfish, and various larvae. Plankton is an important food source for fish and other larger organisms.

[German, from Greek, neuter of planktos, wandering, from plazein, to turn aside; see plāk- in Indo-European roots.]

plank·ton′ic (-tŏn′ĭk) adj.
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Adj.1.planktonic - of or relating to plankton
References in periodicals archive ?
The level of NO release from BIOC51 has proved sufficient for eradacting planktonic and biofilm-based bacteria, and can be delivered to the lungs as a dry powder or solution (e.
Like all jellyfish, it's a carnivore, feeding on planktonic animals that drift into its curtain of tentacles, which can stretch for several meters.
coli O157:H7 in planktonic and biofilm state under stressed conditions of NaCl, pH, temperature and ORS (Oral Rehydration Salt) powder and then make comparisons.
Among the topics are Otto Renz (1906-92): pioneer of the Cretaceous and Paleogene stratigraphy of the Central Apennines, a history of the paleomagnetic investigations in the Umbria-Marche Apennines, whether the Rotalipora cushmani extinction at Gubbio is a planktonic foraminiferal testimonial of the onset of the Caribbean large igneous province emplacement, environmental fluctuations during the latest Cenomanian level in the Gubbio area based on an ichnofabric approach, and the Eocene Thermal Maximum 3: reading the environmental perturbations at Gubbio.
Many of the early microbiological studies of bacteria, including their discovery and characterisation, were performed with planktonic bacteria, which are characterised as individual free-living (free-swimming) bacteria.
Adult and juvenile fish influence planktonic communities in natural environments, reducing densities and/or the average population size of some organisms and consequently, enabling the population growth of other (Kissic, 1987; Guest, Drenner, Threlkeld, Martin, & Smith, 1990; Gerking, 1994; Karus, Paaver, Agasild, & Zingel, 2014; Sass et al.
There is extensive information on estuarine and coastal planktonic decapod in neotropical Brazil (Schwamborn & Bonecker, 1996; Schwamborn, 1997; Porto-Neto et al.
A significant, dose-dependent anti-biofilm effect was observed and notable even at a concentration lower than the active concentration on planktonic cells, i.
In a comparison of virulence factors between biofilm-forming isolates and planktonic cells, significant difference was seen for plasma coagulase and hemolysin production.
Objective: Robust stratigraphic correlations are essential in deciphering Earth History, yet there are crucial gaps and limitations in the current status of Cenozoic planktonic foraminiferal biochronology.
The concentrations of antibiotics required to inactivate biofilm bacteria becomes more than that of required for planktonic organisms.