Shark swims through fish by Michael Gerken (8 images)

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A sand tiger shark swims through the middle of a mesmerising spiral of tiny grey fish.
Thousands of the little bait fish form a hypnotic swirling pattern, while the shark elegantly glides through the centre of them.

Although the sea predator is surrounded by fish, he is not actually hunting - and the fish are schooling around him for their own protection.
Photographer Michael Gerken, 49, took these stunning images on shipwrecks off the coast of North Carolina, USA.
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