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2006: Behaviour: All Other Animals - Highly Commended

Alexander Mustard Enlarge image Snappers in synchrony

Alexander Mustard (United Kingdom)

Snappers in synchrony

Swimming off the edge of a coral atoll into the big blue is exciting for a diver. But it's less exciting for fish high on the menu of local predators. Guraidhoo Corner off South Malé Atoll, in the Maldives, is outside the reef and attracts many reef sharks. Paddletail snappers in this exposed environment respond to anything bigger than them, including a human diver, by bunching into a tight, defensive ball. 'The shape of the formation continually morphed as the fish jostled for position,' says Alex. 'I waited for the fish to create different shapes and took a series of frames. When they formed this perfect sphere, I knew I had an interesting picture.'

Nikon D2X with 17-35mm AFS lens; 1/100 sec at f6.3; 100 ISO; Subal underwater housing.

This photograph is available to buy as a print.

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