WA Reefs Cooked: Record Bleaching Devastates Coastline

Western Australia's coral reefs endured the most widespread bleaching event on record between August 2024 and June 2025. Approximately 2000 kilometers of these vital ecosystems were destroyed as ocean temperatures soared. Persistent heat stress remained for 80 to 160 days along vast stretches of the coastline, a critical finding detailed in a recent global coral reef assessment.

The Pilbara region's reefs experienced extreme bleaching and mortality exceeding 75 percent. Even the renowned Ningaloo Reef, the world's longest fringing reef, recorded its most severe bleaching event to date, with 30 to 70 percent of its coral communities damaged. Scientists note that recovery from such severe bleaching typically takes five to ten years, but the frequency of these events is increasing.

This event is particularly concerning as it impacted previously pristine areas like Ningaloo and Rowley Shoals that had not faced severe bleaching multiple times before. Scientists are concerned about potential future impacts from predicted weather events, noting that background temperatures are rising rapidly, making it difficult to predict the extent of damage.

While climate change is a primary stressor, other factors like flood events, cyclones, and dredging also affect WA reefs. Despite the concerning global decline in coral cover, experts emphasize that recovery is still possible if conditions allow corals sufficient time to recuperate between stress events.