“As predicted last month, the Sargassum amount in each region but the east Atlantic increased in April.

“The increases in the Gulf of Mexico and western Caribbean Sea were typical as in most previous years, but total amounts in the eastern Caribbean Sea and west Atlantic reached surprisingly high levels – they were both 200 per cent higher than their historical records in April. Similarly, the total amount in all regions combined was 150 per cent higher than the historical record in April.

Furthermore, this total amount was 40 per cent higher than the all-time high in June 2022, which makes 2025 a new record year.

“Most of these increases are due to both local growth and physical transport, but the exact reasons behind these new historical records need to be investigated.

“Corresponding to these increases, Sargassum beaching events have been reported around the Caribbean and along the southeast coast of Florida.”

The NOAA said May is expected to see continued increases in most regions.

The NOAA said Sargassum inundation will continue to occur in most of the Caribbean nations and islands as well as along the southeast coast of Florida.