Unlike the open ocean,
the water here is rich in plankton,
feeding huge shoals of fish and even giant manta rays.
Each sea lion needs over six kilograms of fish a day.
With shoals this size, it shouldn't be too difficult.
But it's not easy picking one fish out of the crowd.
The fish know there's safety in numbers,
so for the sea lions the trick is
to snip the shoal into smaller and smaller balls.
Finally, a fish breaks for cover.
It's what the sea lions have been waiting for.
Crevices in the reef might seem to offer shelter.
But that's no problem for the sea lions,
who simply scare them out with bubbles.
With the sea lions distracted,
the fish regroup and the chase starts all over again.