Underwater shot of spawning by a species of small-poly stony coral (genus Acropora). - HD Bildbanksvideo

Underwater shot of spawning by a species of small-poly stony coral (genus Acropora). Full shot of colony of small-polyp stony corals and zoom in and close up shot of individual polyps. Acropora is a genus of reef-building corals (the corals build themselves hard skeletons). These corals spawn once each summer for a period of only 10 minutes.