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 ?
While many of the researchers involved in the project will continue their studies of red tide and human health, the overall study as originally designed is complete.
Henthorne said there are mitigating technologies which can manage the influence of red tide and which have been successfully demonstrated in the UAE, but not all membrane desalination plants are equipped with this technology yet, she added.
Nevertheless, the question looms as to whether increasing manmade impacts bear some level of blame for aggravating red tides.
If the same happens in manatees, he says, it might explain their disorientation and seeming inability to swim away from a red tide.
During recent years, red tides have contained toxic organisms, but none have been detected at present.
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.
One group consists of Sarasota County lifeguards, who are occupationally exposed to red tide.
Newly developed analytical capabilities were applied to studies of exposure and subsequent body burdens in both laboratory animals and marine mammal, fish, and bird die-offs in the wild that were associated with Florida red tides and their aerosols (Bossart et al.
Not only does Florida's red tide produce at least nine neurotoxins, he says, but the bloom's high nighttime respiration can also suck much of the oxygen from the water.
The technical team from the Centre for Marine Environmental Research in the Ministry of Environment and Water, continue to control and monitor the movement of red tide which has emerged recently on a number of areas around the East coast, said Al Jamali.
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).
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.