Environment

Seaweed Raft

A massive 8,000km long blob of seaweed is floating towards Florida, Mexico, and the Caribbean. The Great Atlantic Sargassum Belt - a raft of biomass stretching from West Africa to the Gulf of Mexico - contains scattered patches of seaweed on the open ocean.

It's not a new occurrence, but scientists say that this year’s bloom could be one of the biggest ever recorded. The thick, brown seaweed is already carpeting some beaches in Florida, releasing a pungent smell as it decays and entangling humans and animals who step into it.

Sargassum is a leafy brown seaweed festooned with berry-like air pockets. The seaweed floats on the open ocean and - unlike other marine plants- reproduces on the water's surface. The air-filled structures help to give it buoyancy. Sargassum originates in a vast stretch of the Atlantic Ocean called the Sargasso Sea, well off the southeast coast of the US.

The matted brown mass of seaweed stretches across the ocean and provides breeding grounds, food and habitat for fish, sea turtles and marine birds.