Page last updated at 12:29 GMT, Tuesday, 5 May 2009 13:29 UK

The perilous business of tagging

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Gaia Vince reports from the South Ari atoll in the Maldives on the successes and challenges of tagging whale sharks.

Little is known about the breeding and migratory habits of the sharks, the world's largest fish.

Here, the moment that a whale shark is tagged is caught on film.

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