Great Barrier Reef’s baby boom holds the key to its protection

In one of the most extraordinary natural phenomena on the planet, corals simultaneously reproduce once a year, releasing enough spawn to produce trillions of baby corals.

This spawning event, happening right now, provides scientists with an opportunity to fast-track world-leading research to help the Great Barrier Reef resist, adapt to and recover from the impacts of climate change. 

Minister for the Environment Sussan Ley said, “The Morrison Government’s $150 million Reef Restoration and Adaptation Program includes world-leading scientific research into spawning and ‘Coral IVF’ to strengthen and restore reefs.

“This time of year is an exciting one for everyone on the Reef but particularly for our scientists,” Minister Ley said.

“Latest reports on the Reef show that we are seeing strong increases of hard coral cover but there are still significant threats from rising sea temperatures and we are working with the Great Barrier Reef Foundation and Marine Scientists to ensure the resilience of the Reef.”

Great Barrier Reef Foundation Managing Director Anna Marsden said, “Climate change is the greatest threat to our Reef. In addition to reducing emissions, we need to pioneer new solutions to create a toolbox of techniques that can be used to help protect the reefs we have left, restore lost reefs and help corals adapt to warming ocean temperatures.

“From Lizard Island in the far north to Townsville and Heron Island further south, scientists are busy collecting spawn as part of the world’s largest collaborative effort to protect an ecosystem from climate change, the Reef Restoration and Adaptation Program,” Ms Marsden said.

Southern Cross University Distinguished Professor Peter Harrison was part of the small team of researchers to discover mass coral spawning 40 years ago.

He is on Lizard Island with research partners, Australia’s national science agency CSIRO and QUT to carry out a novel coral larval restoration technique that he’s spent many years developing and refining.

“We’re excited to be scaling up the coral larval restoration process on the Great Barrier Reef collaborating with research partners at Lizard Island, and our aim to optimise large-scale larval production directly on the Reef,” Professor Harrison said.

“We are trialling new methods to capture coral spawn slicks, grow many millions of larvae in different larval culture pools floating in the lagoon at Lizard Island, and then test different methods to deliver and settle healthy larvae onto reef sites damaged by mass bleaching events, which no longer have enough live corals present”.

“The timing of these projects coincides with the 40th anniversary of the discovery of the mass coral spawning on the Great Barrier Reef, and that discovery now enables us to efficiently collect coral spawn and culture larvae from many species to scale up coral restoration processes,” Professor Harrison added.

CSIRO Senior Research Scientist Dr Christopher Doropoulos is leading the research on Heron Island.

“Research on coral spawning plays an important role in aiding innovative approaches to help restore damaged parts of the Reef. Understanding how coral responds to different interactions and disturbances during all stages, from coral reproduction to coral larvae development and settlement, is helping us predict and test coral recovery at larger scales,” said Dr Doropoulos.

“Our trials at Heron Island have been really promising so far and we are now testing and optimising some of these methods at Lizard Island to help scale-up restoration efforts for larger areas of the Reef that need it.”