Indian Ocean coral bleaching

The 2020−21 La Niña has ended, having been active since September 2020 and IOD remains in a neutral state.

Conditions are cooling for most parts of the southern region save for eastern Madagascar, La Reunion, and Mauritius where hot conditions have persisted throughout the year. Read more in the alert on the right.

For materials and guidance on responding to coral bleaching and mortality, visit this page. Bleaching alerts from 2009 to date are available further down the page, and more information is available at these links – background, and methods.

Indian Ocean Bleaching observations Dashboard 2016-2021click to open the dashboard

The dashboard shows bleaching records from 2016-2020 and will be updated frequently with observations using reports made via the bleaching report form (right), or at this link –

Data displayed here is updated to the global bleaching database maintained by the NOAA Coral Reef Watch programme.

Access maps for 2016 coral bleaching and mortality observations.

Report coral bleaching

Submit basic observations on coral bleaching through this embedded window, or go to the google-form at this link. All data will be submitted to the global bleaching form supported by the NOAA Coral Reef Watch programme, and made accessible on a WIO regional database under development.

Historical bleaching – 2009 to present

All past bleaching alerts, from 2009 to the current year, are in the window below. Click on the relevant year, or scroll left/right within each year for additional alerts. Alerts are published between January and May each year, with fewer alerts when bleaching risk is low.