Asian carp leaping out of the water
Media playback is unsupported on your device
Video

'Monster' carp threat to Great Lakes

The US city of Chicago is considering drastic measures to prevent giant fish infesting North America's Great Lakes.

Authorities are thinking of blocking the city's canal system to stop Asian carp entering Lake Michigan.

Such a move could cost up to $18bn (£11bn) and cause huge economic disruption to the city.

Pallab Ghosh reports from Chicago.

Go to next video: Will carp burgers take off in Chicago?