Trevor Ng
Red tide is a higher-than-normal concentration of microscopic algae that produce toxins affecting the central nervous system of fish and making shellfish dangerous to eat. The toxins may also irritate people's respiratory systems. In Florida, red tide is caused by the Karenia brevis species, which can discolour the water red or brown. Red tide has been detected in waterways and beaches around Tampa Bay and along Gulf Coast beaches as far south as Marco Island. It has also been detected as far north as Pasco County and as far south as Monroe County, briefly reaching some islands in the Florida Keys.
| Characteristics | Values |
|---|---|
| What is a red tide? | A higher-than-normal concentration of a microscopic alga (plant-like organisms). |
| What causes red tide? | Pollution, leaking sewer systems, septic tanks, and fertilizer runoff from farms. |
| How does it affect the environment? | It can kill fish, birds, and manatees, and make shellfish dangerous to eat. |
| How does it affect humans? | It can cause respiratory irritation and coughing, sneezing, and tearing. |
| Where is it found? | Red tide is found in Florida, primarily on beaches on Florida's western coast and beaches in the Gulf of Mexico. |
| How often does it occur? | Red tide occurs nearly every summer along Florida's Gulf Coast. Low levels of red tide are found in the Gulf of Mexico year-round. |
| How is it monitored and studied? | Scientists at the National Ocean Service monitor and study red tide to provide communities with advance warnings and help them deal with adverse effects. |
| What can people do to protect themselves? | People can wear masks to filter out marine aerosol particles, keep windows closed, and use air conditioning to reduce exposure to red tide toxins. |
| Is it safe to eat seafood during a red tide? | Commercially-bought shellfish are safe to eat as they are tested for red tide toxins. Recreationally harvested shellfish, fish, crabs, and shrimp can be eaten in affected areas as toxins are not absorbed in edible tissues. |
| What is being done to mitigate red tide? | Local governments are implementing fertilizer black-outs during rainy summer months, and new technologies like specialized clay are being tested to mitigate blooms. |
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What You'll Learn
- Red tide is caused by a higher-than-normal concentration of a microscopic alga, Karenia brevis (K. brevis)
- K. brevis produces a toxin that can affect the central nervous system of fish and cause respiratory irritation in people
- Red tide has been known to affect beaches in the Gulf of Mexico, including those in Florida and Mexico
- The occurrence of red tide cannot be predicted, but scientists can provide a forecast of where a bloom will move using wind and water current data
- Efforts to mitigate red tide include the use of specialized clay and enacting fertilizer black-outs during rainy summer months to reduce pollution
Red tide is caused by a higher-than-normal concentration of a microscopic alga, Karenia brevis (K. brevis)
Red tide is a higher-than-normal concentration of a microscopic alga, Karenia brevis (K. brevis). This species of algae is found almost exclusively in the Gulf of Mexico, from Mexico to Florida, and has been documented as far back as the 1700s. K. brevis is a photosynthetic, single-celled organism that produces a toxin that can affect the central nervous system of fish and other vertebrates, causing them to die. At high concentrations, known as a bloom, these organisms can discolour the water a red or brown hue.
K. brevis is a dinoflagellate, which means it has two flagella that allow it to move through the water in a spinning motion. Dinoflagellates are also major producers of oxygen in the ocean. However, when supplied with excess nutrients, they can multiply uncontrollably, becoming a harmful algal bloom (HAB) that smothers nearby ocean life. These blooms can deplete the water of dissolved oxygen, creating a "dead zone" where fish and other creatures that breathe underwater cannot survive.
The occurrence of a red tide cannot be predicted, but scientists can forecast its movement using wind and water current data. Red tides can be transported around the Gulf of Mexico and even into the Atlantic Ocean by coastal waters and winds. While there is no direct link between nutrient pollution and the initiation of red tides caused by K. brevis, once transported inshore, these blooms can use man-made nutrients for their growth.
The effects of a red tide depend on its movement and concentration. In addition to causing the death of marine life, red tides can also lead to respiratory irritation in humans, especially those with severe or chronic respiratory conditions. K. brevis produces brevetoxins, which can become airborne and cause coughing, sneezing, tearing, and an itchy throat. These toxins can also accumulate in shellfish, leading to neurotoxic shellfish poisoning in humans who consume contaminated shellfish.
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K. brevis produces a toxin that can affect the central nervous system of fish and cause respiratory irritation in people
Red tide has been affecting Gulfport, Florida, with reports of low levels of K. brevis off the coast of Williams Pier in June 2021. K. brevis, or Karenia brevis, is a species of algae that causes red tide blooms, which can have detrimental effects on marine life and human populations.
K. brevis produces a toxin known as brevetoxin, a neurotoxin that can cause respiratory irritation in humans and harm the central nervous system of fish. Brevetoxins are released when K. brevis cells are broken open by wave action, creating an aerosol that carries the toxins onshore in sea spray. This can lead to respiratory issues such as eye, nose, and throat irritation for people in coastal areas. While K. brevis is typically found in low and harmless concentrations, during a red tide bloom, the population grows unchecked, resulting in harmful algal blooms (HABs).
The Florida Fish and Wildlife Conversation Commission and Pinellas County conducted water quality testing in June 2021, revealing low to very low concentrations of K. brevis south of Clearwater, with medium concentrations at Clearwater Beach, Honeymoon Island, and Fred Howard Park. While there were no reported fish kills related to red tide in the past week, large-scale fish kills are known to occur due to K. brevis, impacting various fish species, including large predatory fish such as sharks.
Brevetoxins can be fatal to fish, marine mammals, birds, and corals. They also pose a threat to the fishing industry and economy, with shellfish harvested from affected areas potentially containing brevetoxins, leading to neurotoxic shellfish poisoning (NSP) in humans. The Florida Department of Health advises residents to avoid harvesting or consuming shellfish or distressed or dead fish in red tide locations and to keep pets away from the water, sea foam, and dead sea life.
To minimize the impact of red tide, Pinellas County has implemented a ban on fertilizers containing nitrogen and phosphorus, as these nutrients can worsen red tide blooms. Additionally, residents are encouraged to use tools like the Red Tide Respiratory Forecast Tool to check for respiratory irritation levels before visiting the shore.
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Red tide has been known to affect beaches in the Gulf of Mexico, including those in Florida and Mexico
Red tide is a harmful, mostly saltwater algae bloom that has been known to affect beaches in the Gulf of Mexico, including those in Florida and Mexico. It is caused by a type of algae called Karenia brevis, which produces a toxin that can be harmful to marine life and cause respiratory irritation in humans. While red tide is most commonly found in the Gulf of Mexico, it can occasionally reach other areas, such as the Northern Gulf Coast states or Florida's Atlantic coast.
In the past, red tide has been reported to affect the beaches in Gulfport, Florida, with varying levels of intensity. For example, in June 2021, low levels of red tide were detected in Gulfport, while medium levels were found in Ft. DeSoto. By July 2021, red tide cleanups by the City of Gulfport and Pinellas County Public Works had slowed down following a decline in fish kills. However, the effects of red tide were still present in the area, with residents advised to avoid harvesting or consuming shellfish or distressed/dead fish and to keep their pets away from the water.
The Florida Fish and Wildlife Conversation Commission and Pinellas County conduct regular water quality testing to monitor the presence of red tide. They also provide resources and guidelines for residents, such as the Red Tide Respiratory Forecast Tool, which helps individuals sensitive to red tide plan their beach visits accordingly. Additionally, the county had implemented a ban on fertilizers containing nitrogen and phosphorus, as these nutrients can worsen red tide blooms.
The City of Gulfport also takes proactive measures to manage red tide incidents. The city manager, Jim O'Reilly, reported that staff meets daily to discuss government-based red tide monitoring reports and information from local boat captains to plan appropriate actions, such as cleanup operations or posting usage warnings for public areas.
While red tide can have negative impacts on marine life and cause respiratory issues, it is important to stay informed and follow the guidelines provided by local authorities to minimize risks and safely enjoy the beaches in the Gulf of Mexico and affected areas in Florida and Mexico.
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The occurrence of red tide cannot be predicted, but scientists can provide a forecast of where a bloom will move using wind and water current data
Red tide is a higher-than-normal concentration of a microscopic alga (plant-like organisms). In Florida, the species that causes most red tides is Karenia brevis (K. brevis). This organism produces a toxin that can affect the central nervous system of fish. At high concentrations (called a bloom), the organisms may discolour the water a red or brown hue. The water can even remain its normal colour during a bloom.
The occurrence of a red tide cannot be predicted. However, scientists can provide a forecast of where a bloom will move using wind and water current data. They can also monitor the concentration of the red tide organism by collecting water samples routinely and in response to blooms. Red tide movement and concentration are important because the effects of a red tide, such as dead fish and human respiratory irritation, depend on these factors. The information provided by forecasting and monitoring allows people to make informed decisions about their beach plans.
Red tides can last as little as a few weeks or longer than a year. They can even subside and then reoccur. The duration of a bloom depends on physical and biological conditions that influence its growth and persistence, including sunlight, nutrients, salinity, and the speed and direction of wind and water currents. Red tides most often form in late summer and early fall and persist through winter to spring.
In Florida, red tide has been detected in waterways and beaches around Tampa Bay and along Gulf Coast beaches as far south as Marco Island. It has also been detected as far north as Pasco County and as far south as Monroe County, even reaching some islands in the Florida Keys. Beach visitors are advised to check the most recent red tide map, air quality forecast, and other updates from local officials before making plans.
Red tides can have devastating effects on the marine environment and marine life. Many locations have experienced fish kills and the injury or death of larger marine life, including dolphins and manatees.
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Efforts to mitigate red tide include the use of specialized clay and enacting fertilizer black-outs during rainy summer months to reduce pollution
Red tide, caused by a higher-than-normal concentration of a microscopic plant-like organism, has been affecting Florida and the Gulf of Mexico for centuries. Karenia brevis, also known as K. brevis, is the species responsible for most red tides in this region. While red tides typically occur in the fall and winter months, summer blooms have become increasingly common, causing significant ecological and economic damage.
To mitigate the impact of red tides, researchers and local governments have been exploring various strategies, including the use of specialized clay and fertilizer black-outs. The City Council of Venice, Florida, passed a resolution encouraging residents to refrain from using lawn fertilizer, recognizing that nutrient pollution from fertilizers can contribute to red tide formation. However, scientists have cautioned that a total ban on fertilizer use could have unintended negative consequences for the environment, including limiting plant growth and weakening root systems.
One promising approach to red tide mitigation is the use of specialized clay. Scientists have been testing a modified clay mineral that, when dispersed on the ocean surface, binds with red tide cells and their toxins, carrying them to the seafloor. This process, known as clay flocculation, has been shown to effectively remove both intact red tide cells and dissolved toxins from the water. In addition, clay treatments have been found to have minimal impact on commercially valuable blue crab populations, making it a promising tool for controlling red tides without causing significant ecological disruption.
The development of highly effective clays and the success of clay flocculation in other countries, such as China and Korea, have renewed interest in this mitigation technology for use in the United States. Researchers are also experimenting with other innovative tools and compounds, such as ozonation technologies and barley extract, to minimize the toxic effects of red tides without altering the delicate balance of the Gulf ecosystem.
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Frequently asked questions
Red tide is a higher-than-normal concentration of a microscopic alga (plant-like organisms) that produce toxins. These toxins can kill fish and make shellfish dangerous to eat. They also make the surrounding air difficult to breathe.
Red tide has been detected in waterways and beaches around Tampa Bay and along Gulf Coast beaches as far south as Marco Island. It is recommended to check the most recent red tide map for the latest information.
Red tide can occur at any time, but in Florida, it typically blooms in the late summer or early fall.
The effects of red tide include dead fish and respiratory irritation in people. In severe cases, it can also cause larger marine life such as dolphins and manatees to become injured or die.
Commercially available shellfish are safe to eat during a red tide as they are tested for toxins before being sold. Recreationally harvested shellfish, however, should be avoided during this time. Fish and shrimp are also safe to eat as the toxin is not absorbed into their edible tissues.
