RED TIDE, SHELLFISH - USA (02): (TEXAS) OYSTER
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Date: Wed 14 Dec 2011
Source: The Florida Independent, USA Today report [edited] <http://floridaindependent.com/60885/algae-outbreak-shuts-down-texas-oyster-industry>
A widespread toxic algae outbreak has shut down oyster season across the Texas coast and caused health problems for many nearby residents.
Fueled by Texas' ongoing drought, the algae -- known as _Karenia brevis_ -- [one of the causative agents for red tide. - Mod.TG] thrive in warm, salty water and have spread through the bays and islands along Texas' 350-mile coast [560 km], says Meridith Byrd, a marine biologist for the Texas Parks and Wildlife Department. The algae could cause nausea, vomiting, and diarrhea in humans and are harmful to fish but not fatal to people, she says.
State health officials took the rare step of closing the entire coast for oyster harvesting -- all 17 586 acres [7117 ha] of oyster beds -- before the season opened 1 Nov 2011. The state has shut down the entire coast before, most recently in 2000, according to state health officials. But the size of the current bloom coupled with the state's ongoing drought and lack of rain could make it one of the biggest and most destructive in history, Byrd says. The bloom so far has killed
4.5 million fish, she says.
In Florida, algae blooms have caused health problems for residents and, in towns that rely on water to fuel their business, have hurt the bottom line.
The Texas bloom appears different from those in Florida and is likely caused by red tide that, due to the drought, is creeping ever-closer to oyster beds near the shore.
A parasite known as "dermo", which has fast been spreading through Texas coastal waters, is also becoming a major threat to the industry.
And it isn't just the shellfish industry that's hurting. One hardware store owner told USA Today that the closures are costing his business at least USD 4000 a month. Restaurants, fueling stations, and fishing equipment suppliers have also been negatively impacted.
The Texas bloom is only the latest in a string of events negatively affecting the state's USD 30 million oyster industry. In 2005, Hurricane Katrina devastated the Gulf Coast area, and remains the costliest natural disaster the country has ever seen. Last year's [2010] gulf oil spill only made matters worse -- especially for the fishing industry, which is still grappling with consumer's concerns over the safety of Gulf of Mexico seafood.
[Byline: Virginia Chamlee]
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Communicated by:
ProMED-mail from HealthMap alerts
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[This article is confusing.
Red tide is the name of a situation caused by one or more dinoflagellates, of which _Karenia brevis_ is one of the more prevalent organisms. _Karenia brevis_ has been known by other names:
_Ptychodiscus brevis_ and _Gymnodinium breve_. This organism, by any of these names, produces brevetoxins and its derivatives.
Dinoflagellates are marine single-celled, photosynthetic organisms that can "bloom".
Dermo is the common name for an oyster disease caused by the protozoan parasite _Perkinsus marinus_, a single-celled organism that has many different life stages. It thrives in water when the temperature is between 25 and 30 deg C (77 and 86 deg F). Or, stated another way, generally between May and October in the warm Gulf of Mexico waters.
While the organism is frequently found there, it can thrive in any marine waters that meet its temperature requirements and have oysters for it to infect.
Dermo infects the digestive system of the oyster causing a rather slow death, over the course of 1 or 2 years. It impairs the oyster's ability to feed, to reproduce, and to live.
So in reality, there may be 2 problems. Both problems have profound impact on the oyster industry. However, red tide does not cause dermo and dermo does not cause red tide. They are 2 separate events that happen to affect oysters. - Mod.TG]
[Texas and the Gulf of Mexico can be seen on the HealthMap/ProMED-mail interactive map at <http://healthmap.org/r/1mfK>. - Sr.Tech.Ed.MJ]
[see also:
Red tide, fish - USA (03): (FL) 20111202.3513 Red tide, fish - USA (02): (TX) 20111104.3283 Red tide, fish - USA: (TX) 20111026.3180 Red tide, shellfish - USA: (MA) alert 20110506.1400 2010
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Paralytic shellfish poisoning - USA: (ME) warning 20100714.2353
2007
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Paralytic shellfish poisoning, human - USA (ME) 20070802.2508 Red tide, aquatic mammals - USA: (FL) 20071231.4199 Manatee deaths, red tide - USA (FL) 20070403.1129
2006
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Red tide, shellfish - USA (WA) 20060824.2388
2005
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Red tide - USA (TX) 20051002.2886
Red tide - USA (FL) (06) 20050925.2829
Red tide - USA (FL) (05): sea turtles 20050819.2437] .................................................sb/tg/mj/dk/ll
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