[00:07.580]You might think it would be easy for a fish to swim between these small islands
[00:12.360]But not so
[00:15.110]You wouldn't find these little fish in deep water
[00:21.980]The open ocean beyond their shallow reef is, in fact, a huge barrier
[00:27.520]So how did all these fish come to be here
[00:35.460]Colonising new reefs is a challenge faced by fish across the South Pacific but they have a simple solution
[00:44.100]Once a year, thousands of groupers gather on the reefs
[00:48.670]With the coming of the full moon, an extraordinary event unfoylds
[00:59.930]They spawn
[01:02.520]A female darts up and releases millions of eggs
[01:06.150]quickly followed by the males, who jostle to fertilise them