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A school of mechanical, battery-powered robots in the shape of fish will be released into a Spanish port to help monitor pollution there, scientists said Friday.

The 5-foot-long robots work by mimicking the swishing movements of a fish's tail, according to University of Essex robotics expert Huosheng Hu, whose team is manufacturing the machines.

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Schools of robotic fish could be sent into the Thames to produce a 3D pollution map of the river.

Researchers at the University of Essex in Colchester are working on the robofish as part of a £2.5million EU-funded project to find new ways of monitoring water waste.

Each fish will be about 50cm long, 15cm high and 12cm wide. They will be packed with pollution sensors that can electronically 'sniff' harmful chemicals in the water.

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