Indian Ocean coral bleaching

07 January 2019 – Indications are for a reasonably hot 2019 bleaching season in the Western Indian Ocean, with moderate to high bleaching expected, and first occurrence of bleaching around Madagascar. All monitoring programs, conservation areas and groups invested in coral reefs should initiate early observations to determine the first onset of bleaching in their area and report to the links below.

See the full alert in the pdf at 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.


Bleaching observations map – 2017

The map shows 2017 bleaching recorts, but will be updated with 2019 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.