Robotic fish detect water pollution

A robotic fish is seen in a tank at the London Aquarium in this October 6, 2005 handout photo made available March 20, 2009. The carp-shaped robots, costing 20,000 pounds ($29,000) apiece, mimic the movement of real fish and are equipped with chemical sensors to sniff out potentially hazardous pollutants, such as leaks from vessels or underwater pipelines. The robots to be used are bigger than those which were seen at the London Aquarium and they measure 1.5 metres (nearly 5 feet) long -- roughly the size of a seal.

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