"Shocking" coral bleaching off the west coast of Australia

The Ningaloo Reef is part of a World Heritage marine park. The latter is actually known for its glowing corals.

The exact extent of the damage has not yet been determined by the environmental authorities, said marine scientist Quigley. However, it could be the worst mass bleaching in the region for years.

"The warm oceans have really cooked the corals this year," the scientist told the AFP news agency. "It wouldn't be wrong to use the word 'unprecedented'."

Coral bleaching occurs when water temperatures rise. The corals then shed microscopic algae living on them in order to survive. If the water temperatures remain high, the corals turn white and die.