The Great Barrier Reef is one of the seven great wonders of the natural world with the tourist numbers to match.

Image: Business Insider

Despite the large number of visitors, a little seen phenomena at the reef is the spawning when the coral releases gamets into the ocean so they can reproduce.

Occuring according to lunar cycles and water temperature, the event can be hard to see, but photographer Gary Cranitch has witnessed this great event with his camera.

Image: Gary Cranitch via

Published in over 50 publications and contributor to many marine life surveys, not only is Cranitch’s work spectucular, he also provides valuable insight into the health of the coral reef.