Corals are born in a number of different ways, but most often by mass spawning: all of the individuals of a single species on one night a year, releasing all the eggs they've made that year into the water column, packaged into bundles with sperm cells.
Koraller föds på många olika sätt, men oftast genom massreproduktion: där alla individer av en art, under en natt varje år, släpper ut alla ägg  de producerat under året i vattnet, paketerat i knyten med spermier.