Coral spawning is vital for the Great Barrier Reef’s reproduction.
Each year corals synchronise the release of trillions of eggs and sperm. The baby coral polyps created during the spawning event drift to the bottom and take hold, helping a reef to grow or rebuild.
We sent a camera to film the annual spawning event at Lizard Island late last year, but there was almost nothing to see. The spawning was reduced by coral bleaching, an impact of climate change.