THE seaweed coming ashore on beaches along Trinidad's east coast and Tobago, is the result of a natural phenomenon happening thousands of kilometers away in the North Atlantic Ocean.

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Coastal mystery solved

....a natural phenomenon happening thousands of kilometres away

By Sue-Ann Wayow sue-ann.wayow@trinidadexpress.com

THE seaweed coming ashore on beaches along Trinidad's east coast and parts of Tobago, is the result of a natural phenomenon happening thousands of kilometres away in the North Atlantic Ocean.

For the past three weeks, bathers have found the shoreline
between Manzanilla and Guayguayare covered in a think mat of
seaweed, which had made it impossible to go swimming, and
which has also fouled the nets of fishing boats.

The beaches along the east coast were all but deserted last weekend.
Institute of Marine Affairs (IMA) acting director Dr. Donna-May Sakura-Lemessy said the seaweed was a brown macroalgae known as Sargassum, originating in the Sargasso Sea.

The Sargasso Sea is located in the middle of the Northern Atlantic Ocean. Sakura-Lemessy said during this time of year, strong prevailing winds, storm activity and spiraling currents disperse the weed throughout the region.

As currents intersect with the edges of the Sargasso Sea, they break off parts of the larger Sargassum mat that covers more than three million squared kilometres, she said.

Sakura-Lemessy said: "The currents carry the seaweed along with them, eventually sweeping it eastwards into the Caribbean islands where local currents carry it ashore. This is a natural phenomenon that occurs cyclically, but some years are worst than other. In 2011, the same phenomenon was experienced. Unfortunately, once ashore Sargassum is slow to decompose resulting in foul smells and it is aesthetically unpleasant to beach goers."

She said: "There isn’t much use for the Sargassum as it does not make for an economically feasible fertilizer. Most countries hire teams or volunteers get together and rake up the seaweed. Some hotels in Tobago for example Bluewaters Inn, hire a backhoe on mornings, which rakes the seaweed and buries it beneath the sand."
"If it is not causing a hazard and it is not hazardous. There is nothing much we could do with it. Usually you could bury it into the sand and then it will decompose and move back out into the sea or you could just leave it to decay except when you have that great mass, it would probably smell a little bit," Sakura Lemessy said.

Minister of the Environment and Water Resources Ganga Singh said he was unaware of the seaweed along the coast but would have liaised with IMA and the Environmental Management Authority (EMA) to find out more.
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