Surveillance being carried out on British river
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Patrolling for poachers on British rivers

22 September 2013 Last updated at 09:35 BST

The number of fish being poached from British rivers has increased dramatically in recent years, according to the Environment Agency.

It has stepped up its surveillance of waterways across the country and has launched covert fishery patrols to try and stop potential poachers in their tracks.

Judy Hobson reports.