Conservationists call for prosecution of whale shark riders

Footage, believed to originate in Venezuela, shows two men standing on back of rare giant shark while being pulled by a speedboat

Conservationists have called for the prosecution of two men filmed "surfing" on the back of a rare whale shark while being towed by a speedboat.

The three-minute video shows two men standing on the whale shark, the largest fish in the world, as people on board laugh and cheer them on. The pair then appear to taunt the giant fish as it continues to follow the boat.