January 5, 2018 - This is what it looks like when coral spawns in the Great Barrier Reef. The timing of spawns depends on water temperature, time of day, and moon phases. Once a year when the water is warm and the moon is full, the coral colonies simultaneously release male and female genetic material. The cells float to the surface and combine into larvae that will eventually turn into new coral colonies.
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See 'Underwater Snowstorm' of Coral Reproducing.