Great Barrier Reef bleaching occurred on over 90 per cent of reefs this summer, report reveals

It is the fourth mass bleaching event in seven years on the reef and the first to occur under La Niña conditions. (Supplied: ARC Centre of Excellence for Coral Reef Studies)

More than 90 per cent of coral reefs surveyed on the Great Barrier Reef suffered some form of bleaching this summer, according to a new report.

The Great Barrier Reef Marine Park Authority annual snapshot details how the 2021-22 summer led to a mass bleaching event of coral.