KUALA LUMPUR, 8 MAY 2023 – Reef Check Malaysia (RCM) is concerned that current unseasonal weather conditions might lead to widespread coral bleaching over the next few weeks.

RCM together with scientists from University Malaya (UM) and University Malaysia Terengganu (UMT), are monitoring the mass coral spawning event that happens around this time of year.

Coral spawning describes the act of corals releasing gametes into the ocean, which then settle to form new coral colonies, and eventually new reefs. So-called “mass” coral spawning occurs when numerous species spawn at the same time, a phenomenon that occurs on cues from the lunar cycle and water temperature.

Corals spawn by releasing their gametes into the ocean

Coral reefs in Tioman Island usually spawn around the full moon of April and October/ November. However, RCM’s team has observed that corals at some of their monitoring sites did not spawn until yesterday, a month later than expected.

“The erratic weather we have been experiencing could have delayed the spawning this year. The worrying part, however, is the water was 31C last night. If it remains this hot, we are definitely going to be hit by bleaching this year,” shared Alvin Chelliah, Senior Progamme Manager of Reef Check Malaysia.

When corals are stressed, they expel the algae (zooxanthellae) living in their tissues which leads to them losing their colour and exposing the white calcium carbonate skeleton underneath – hence the term “bleaching”. They not only lose their colour, they also lose their main source of nutrients, which comes from the zooxanthellae. Mass coral bleaching events may result in the death of coral colonies and affect the wellbeing of marine life and industries that depend on healthy coral reefs.

Coral bleaching happens when corals lose their colour

“Coral reefs are extremely sensitive to the growing impacts of climate change. Marine life are not the only losers due to the loss of our coral reefs. Marine-based tourism could suffer and so will the local businesses and community in the area. No coral reefs means there will be no habitat, nursery, and food for fish. Fishermen will suffer and there are also implications for our food supply” stressed Julian Hyde, General Manager of Reef Check Malaysia.

The last mass coral bleaching event happened in 2010 when Malaysia’s coral reefs suffered major damage, with an estimated 5-10% of corals dying. Based on RCM’s annual surveys, it took five years for the coral reefs to recover.

RCM has also stated their recommendations on how to better protect our coral reefs in their annual survey report here.

For more information on Reef Check Malaysia, you may visit them on their website, Facebook and Instagram or contact them at hello@reefcheck.org.my.

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