What is coral spawning? Some species of coral reproduce by ejecting large quantities of eggs and sperm into the water. When this happens, the eggs and sperm fertilize in the water. In some areas, mass coral spawning events occur on one particular night per year and scientists can predict exactly when this will happen. Trillions of eggs and sperm are simultaneously released into the water in one of the most astounding acts of synchronicity in the natural world! #coralreefs #animals #nature #under