Science

Caribbean shores choked by record amount of seaweed that’s killing wildlife and cutting off tourism

Forget sea monsters and tidal waves. Beachgoers and fishermen alike are having their summers ruined by something far less cinematic: record amounts of foul-smelling ‘sargassum’ seaweed that have inundated huge swaths of Atlantic Ocean shoreline.

The amount of algae found in the tropical, central west and east Atlantic – as well as the Caribbean Sea and Gulf of Mexico – was up to 24.2 million tons in June. That’s an increase from 18.8 million tons a month prior and a record high.

‘If you put all this biomass side by side, the entire area is equivalent to six times of Tampa Bay,’ Chuanmin Hu, a researcher from the University of South Florida who studied the phenomenon, told DailyMail.com.

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The amount of algae found in the tropical, central west and east Atlantic – as well as the Caribbean Sea and Gulf of Mexico – was up to 24.2 million tons in June. Sargasso seaweed is seen above in the North Sound Cayman Islands

'If you put all this biomass side by side, the entire area is equivalent to six times of Tampa Bay,' Chuanmin Hu, a researcher from the University of South Florida who studied the phenomenon, told DailyMail.com. Lakes Beach (above) is covered in sargassum in St. Andrew along the east coast of Barbados

‘If you put all this biomass side by side, the entire area is equivalent to six times of Tampa Bay,’ Chuanmin Hu, a researcher from the University of South Florida who studied the phenomenon, told DailyMail.com. Lakes Beach (above) is covered in sargassum in St. Andrew along the east coast of Barbados

The gigantic amounts of sargassum on beaches and close to the shore have put a damper on tourism and the Caribbean’s vital fishing industries. 

The Sargassum Monitoring Network’s most recent update, shown here, reveals that there are currently 18 beaches in Mexico with excessive amounts of seaweed.

The situation has gotten so bad that in July, U.S. Virgin Islands Governor Albert Bryan Jr. declared a state of emergency. 

In a statement, Bryan said ‘the seaweed overrunning our beaches also brings the potential for disruption to businesses and other negative financial impacts to our economy.’

For those hoping for seaweed-free Caribbean beaches in future summers, Hu said not to set your expectations too high and that massive sargassum blooms in the waters are likely a 'new normal.'

For those hoping for seaweed-free Caribbean beaches in future summers, Hu said not to set your expectations too high and that massive sargassum blooms in the waters are likely a ‘new normal.’ 

A day later, President Joe Biden declared a state of emergency in the territory, citing the threat that clogs of sargassum in the U.S. Virgin Islands’ desalination plants pose to the territory’s fresh water supply.

Once washed ashore, rotting sargassum not only smells terrible but also poses a health problem, with researchers saying it can emit toxic gases that can give humans heart palpitations, shortness of breath, dizziness and other symptoms.

In a 2019 paper for the journal Science, a team of researchers found that sargassum, which was usually more predominant in northern parts of the Atlantic, had become increasingly common in the south since 2011. Hu said there are several reasons as to what sparked that spread, including unusually strong winds and currents the year before.

The southern portion of the Atlantic, with its ample sunshine and nutrient-rich waters, proved to be a fertile ground for sargassum, leading to the current crisis.

Although it wreaks havoc to land-based industries, the United Nations Environment Programme says the seaweed itself isn’t a problem, since it can provide a happy habitat and feeding ground for a variety of sea creatures ranging from crabs to dolphins to an assortment of eels and fish. 

Rather, it’s ‘the large floating mats clogging fishing gear and impeding navigation at sea, and the mass stranding on coastlines and ensuing decomposition that is highly detrimental to people, ecosystems, and economies.’

Hu agreed sargassum largely poses no problem while at sea, but said there is some evidence that the vast amounts of seaweed could pose a problem if huge amounts of it were to die and sink to the bottom of the ocean, where it could smother coral reefs and other environments.

For those hoping for seaweed-free Caribbean beaches in future summers, Hu said not to set your expectations too high and that massive sargassum blooms in the waters are likely a ‘new normal.’ 

Hu noted that sargassum has many uses, from being turned into fertilizer, bricks and tennis shoes to being tossed in a salad – so perhaps there’s some type of opportunity in this crisis.

A mat of Sargasso weed made its way into the north sound and has clumped together along the coast of the North Cayman Islands

A mat of Sargasso weed made its way into the north sound and has clumped together along the coast of the North Cayman Islands

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