Shark Swims through fish by Michael Gerken (9 images)
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.