Indian Ocean coral bleaching

La Niña conditions persist and are likely to continue to the second quarter of 2021, creating unseasonal overcast conditions at least off Kenya/Tanzania.

Sea surface temperatures in the central Mozambique channel have cooled sharply over the last two weeks though warmer than average SST still prevails across most of the WIO basin. See the full alert 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.