Coral spawning

Each autumn Ningaloo stages one of nature’s great spectacles: a mass coral spawn, where hundreds of colonies release their gamete bundles at almost the same moment. Triggered by the moon, water temperature and fading daylight after a full moon, the release sends millions of tiny pink and orange spheres drifting up like an inverted, slow-motion snowfall. By morning they gather into slicks on the surface.

It isn't just spectacle — it's the engine of the ecosystem. The sudden flood of nutrients drives a plankton bloom that helps bring whale sharks and manta rays to the reef, so the spawn is the unofficial starting gun for whale-shark season.

Because Ningaloo is a fringing reef that hugs the shore, the spawn happens within reach of the beaches — but it’s at night, over only a few nights a year, so it takes timing and a little luck. Many visitors see the daytime slicks rather than the night-time release.