red tide


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red tide

natural (and common) phenomenon causing massive extermination of fish and other marine life; caused by algae Karenis brevis or efflorescence of Pfeisteria piscicida.
[in high concentrations of organism, water turns reddish-brown]

red tide

n.
A bloom of plankton, especially dinoflagellates, that causes a usually reddish discoloration of coastal ocean waters. Certain dinoflagellates produce toxins that contaminate shellfish, making them unsafe to eat, and can kill fish.
Environment Harmful algal bloom A body of sea water with high concentrations of dinoflagellates, in which massive algal proliferation imparts a reddish colour to the surface, first described in the Gulf of Maine—US
Management Supportive
Under optimal salinity, temperature and nutrient conditions, marine algae, Gonyaulax catanella and G tamarensis proliferate, producing saxitoxin—a potent neuromuscular toxin that blocks voltage-dependent sodium channels in neurons; not all red tides are toxic and some outbreaks of ‘red tide disease’ occur without the red tide; Gymnodinium breve causes red tide off Florida and in the Gulf of Mexico, but evokes milder neurotoxic reactions—e.g., paraesthesias, abnormal temperature sensation, ataxia, nausea, vomiting and diarrhoea. Saxitoxin concentrates in clams and shellfish—but not in lobster or finned fish; birds, mammals, humans feeding on the shellfish rapidly develop neuromuscular blockade with intense centripetal paresthesias, nausea, vomiting, diarrhea, later vertigo, numbness of face and scalp, sensory loss, dysphagia, dysarthria, intention tremor; if severe, intoxication may cause flaccid quadriplegia or respiratory paralysis and death
Infectious disease A popular phrase from the 1950s that died in the 1960s, for the increased prominence of gram-negative—i.e., ‘red’—bacterial infections, attributed to the indiscriminate use of the first antibiotic, penicillin—which is most effective against gram-positive cocci for most infections—resulting in a relative increase in incidence of gram-negative bacterial infections, causing a ‘red’ shift

red tide

(red tīd)
A natural phenomenon resulting from higher than normal concentrations of the microscopic algae Gymnodinium breve in seawater. When the causative organism is extremely concentrated, seawater can turn a reddish-brown color.

red tide

a bloom of DINOFLAGELLATES which literally turns the sea red. The toxins produced by them, concentrated in shell-fish which may feed upon them, can be fatal to humans.
References in periodicals archive ?
Jon Thaxton, senior vice president for community investment for Gulf Coast Community Foundation, has studied red tide extensively and speaks to groups about it.
"This year has been an anomalous year for red tide," Shay said, but the algae's reach to the east coast, "it happens.
* Making additional biologists and scientist available to support local government's response to red tide and protect wildlife - this is in addition to the staff deployed by Scott.
The Ministry employs latest technologies, such as remote sensors, satellite imagery and digital modelling to locate a red tide and to predict its occurrence to take precautionary measures to reduce its adverse effects.
To stem further problems, the ministry said it is following its National Plan for Red Tide Management by satellite monitoring of the marine environment in cooperation with the Regional Organization for the Protection of the Marine Environment.
Research on the Prediction Method of Red Tide. Red tide is caused by the comprehensive action of multiple factors, such as the sudden proliferation and accumulation of some plankton [8].
She sprang into action when manatees paralyzed by the red tide started arriving.
Red tide is a common name for a phenomenon known as an algal bloom (large concentrations of aquatic microorganisms) when it is caused by a few species of dinoflagellates and the bloom takes on a red or brown color.
The red tide is the first to be detected in the East China and Yellow seas this year.
The phenomenon known as a red tide is actually the result of an algal bloom, an event in which marine or fresh water algae accumulate rapidly in the water.Red tide seriously threatens marine organisms.
Red tide refers to about 60 potentially deadly oceanic biotoxins.
During the red tide event, NCHD issued several beach advisories, beginning September 25, alerting the public to the health risks of exposure to brevetoxins, especially for persons with preexisting respiratory conditions.