Page last updated at 11:51 GMT, Friday, 21 October 2011 12:51 UK

Swimming with whale sharks in Mexico

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Swimming with the world's biggest fish is one of the greatest marine adventures, but concerns have been raised about the impact of increasing numbers of whale shark tourists.

Michelle Jana Chan went to Isla Holbox in Mexico to see how rules and regulations have been changing and what that means for tourists, operators and the whale shark itself.

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