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 ?
Red tide is a natural phenomenon which has been documented in Florida's waters for hundreds of years.
There are three additional possible syndromes to worry about as well from different varieties of red tide - neurotoxic, diarrheic and amnesic shellfish poisoning.
One theory holds that red tides are fueled by phosphorus- and nitrogen-bearing plant nutrients brought to the region by local rivers or carried there from the Mississippi River by ocean currents.
After identifying the most potent of the red tide toxins, the UNC Wilmington researchers discovered two anti-toxins--a man-made compound called [beta]-Naphthoyl-brevetoxin, and brevenal, a natural compound produced by the organism itself--that can block the effects of the red tide toxin on the respiratory system.
Red tides, oceanic algae that paralyze fish and threaten the seafood industry, grew in area by 83 percent in 2004 as pollution conditions worsened in the East China Sea, China's State Environmental Protection Administration said Thursday.
This relationship suggests that prey cell volume does not have an affect on ingestion by the larvae of red tide dinoflagellates.
Bolton's defensive problems are mounting as Paul Warhurst joins the list of absentees, and they could find it hard to resist the Red tide.
But target figures to cut nitrogen and phosphorus, which become nutrients for phytoplankton, will be set to curb the problem of eutrophication and to prevent the occurrence of red tide, the officials said.
From 1976 until 1994 there was an hiatus of red tide blooms.
Donnie Marshall, head of the US Drug Enforcement Administration, said the investigation - dubbed Operation Red Tide - 'is a textbook example of the new multi-agency, multinational law enforcement cooperation needed to thwart organised crime in the 21st century'.
The same red tide swells near the end of the exhibition in Deluge II, 1975, which shows the recumbent painter sticking his brush up Into a red sea of heads, bottles, shoes, legs, frames, and books.
Schaeffer's S&P 500 Index Hot Stocks for Friday, August 11, 2006: PMC-Sierra Manages to Ride Above Fed's Red Tide