In reply to Post #1000
The fisheries and Environment Agency has a duty of care towards people using the lakes and rivers of the uk.
If the fishery that you use has a problem with rodents please complain as this will force them to take measures to control the problem.
As pest control can be a extra cost to the owners many will not want to take the matter serious and turn a blind eye but it is their responsibility to reduce numbers of vermin which cause spread of disease as they are liable if complaints have been made and no action taken.