One of the major concerns has been for coral reefs in the lagoon - which are sometimes called the rainforests of the sea - because of the diversity of life found in them.

Around 25% of fish in the ocean depend on healthy coral reefs, according to the National Oceanic and Atmospheric Administration of the US.

They protect coastlines from storms and erosion. Coral reefs and the marine ecosystems are the major pillars of Mauritian tourism which is a big part of the country's economy.