Coral Spawn

For the second time in my 4 month stay there has been a coral spawn. I know very little about it but it shows on the surface of the ocean as black globules about the size of a pea. This is all floating in what looks like an oil slick. The eggs and sperm are released directly into the water in huge quantities. There is enough of this material floating that you can smell it over much of the island. It only lasts a day or 2 and then is gone.