Patrols target illegal angling in Lincolnshire
Patrols have been taking place across Lincolnshire over the bank holiday weekend as part of a clampdown on illegal angling.
The Environment Agency said the sport was popular during bank holidays, but anyone without a rod licence would "almost certainly end up in court".
Anyone found coarse fishing in rivers before the season opens on 15 June could also be prosecuted.
The agency said those who fish illegally are "cheating other anglers".
Since January, bailiffs have checked 580 anglers for licences across Lincolnshire, Cambridgeshire and Northamptonshire.
A spokesman said: "All the money the Environment Agency receives from rod licence sales is spent improving fisheries.
"Essential work such as surveying, disease control, restocking, habitat improvement and commenting on potentially harmful planning applications is carried out by fisheries staff, who also carry out enforcement."