SOFT corals have begun to spawn the Great Barrier Reef, with a snowstorm of sperm and eggs released into the water outside Cairns.
The main event of the annual biological phenomenon is expected to be triggered tonight and tomorrow, as hard corals simultaneously release their sex cells for mass fertilization.
Marine biologists were based on Sunlover Moore Reef pontoon last night to capture video at night time.
Calypso Production's Stuart Ireland, which has filmed coral goods every year since 1996, resembled the event to swim through an up and down snow storm.
"The booklet varies from small to small pink and mauve balls that represent either eggs or tied eggs and sperm, while cloudy white cuts or smokers represent individual male colonies," he said.
"I like chasing down the individual colonies, it's like playing with the dots.
"Streams and realtopography make this extremely challenging.
"Often you will find the language flowing through the water, but can not trace it to the release colony, or the colony may have just finished."
He said that the special event showed that the Great Barrier Reef was resilient despite
challenges that humans and climate change had thrown in the world heritage area.