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.

red tide

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 ?
The current red tide began along the coast of Zhoushan in the eastern province of Zhejiang, which recorded 27 red tides last year, the official said.
The red tide only affected the Kalba area and the Sewa is monitoring the water in Khorfakkan to ensure it is safe for public use.
Blooms of the dinoflagellate Karenia brevis are responsible for what are commonly referred to as Florida red tides.
He said fishermen and municipal officials had been finding large number of dead fish since the red tides spread along the Ras Al Khaimah Aa coastline during last week, which has now stretched to some areas of Umm Al Quwain.
There's been no stopping a red tide or any other algal bloom as it's buffeted by winds and shuttled by currents.
According to Mote Marine Laboratory, the first recorded incidence of red tide occurred off the coast of Venice, Florida, in the fall of 1947.
As a result of the multiplicity of effects demonstrated by this combination of metabolically relevant structural modifications, receptor binding pharmacology, and single-channel kinetic studies, it was postulated that Florida red tide potency in situ would be a complex phenomenon and the toxicologic consequences of red tides would be based on the amounts and activities of the brevetoxins present (Baden and Tomas 1988; Steidinger and Baden 1984).
Key words: brevetoxins, harmful algal blooms (HABs), Karenia brevis, red tides, sensitive populations.
If you're an asthmatic and there's red tide in town, now is not the time to cheat on your medicine," says Kirkpatrick, who's concerned about those who don't have good health insurance and are forced to stretch one month's medication into two or more months to save money.
While the authorities are controlling the red tides, the ministry has also signed a partnership agreement with a fishing company, Mubarak, to study, protect and boost the fish stock in Umm Al Quwain.
1998), and other marine species during red tide blooms.
People who eat shellfish contaminated with a toxin produced in red tides can become paralyzed or even die.