The Environment Agency is concerned about anglers who disturb and force out breeding birds. Anglers damage rushes and reeds. They also regularly hook swans, and then can cause further suffering when trying to retrieve their hooks and line.
".. disturbance of vulnerable areas, such as concentrations of breeding birds or areas of bankside vegetation."
DISTURBED BIRDS MAY DESERT THEIR EGGS OR YOUNG
"Breeding birds depend upon their nests being quietly concealed and they may desert their eggs or young if they are disturbed. Anglers can also force wintering and moulting wildfowl flocks out of important feeding and roosting areas. Rushes and reeds can be badly damaged by regular trampling."
SWANS AND OTHER BIRDS HOOKED
"Never attempt to restrain an injured swan or any other large bird or animal by holding on to line it may be caught in or hooked to. This can cause severe injury and traumatise the animal even more.