Interesting and knotty subject. I don't have this problem, luckily. I was told by a relation of mine who has a boat on the Grand Union Canla of having stones thrown at his boat as he passed by Anglers, who screamed at either him or his wife or child, used Obscene threats and complained because the boat could snag their lines which were cast to near the opposite bank. ( If they wanted the bait there, why not fish from the other bank?) There is also a small pond, or lake ( It used to have Paddelos for hire, before they were all either damaged or burnt by the Local Yobs) opposite tha Hospital in Folkestone, in the Town Park. This was always used for models, for many years, indeed there are photos of Regattas being held there between the wars.It is shown on old town maps as the Boating Pond. This has now been claimed by the Angling Mafia, if you attempt to sail when an angler is there you will quite likely be threatened or the model stoned, this only useually happens if the anglers are mob handed.But they will make themselves obnoxious and ruin your day. So what fish are in this lake? not a lot, there are a few Carp and roach, but nothing over 9 or 10 inches long, also there are swans on the lake, which are fed by the local mummies, and can get aggressive while nesting, but are mostly OK. The Anglers claim that they pay for Fishing Rights. The Council deny this and say Model Boats are not banned if they do not disturb the swans.This is good as there have been many cases of children and Mummies being attacked by them when nesting or with their young close by. ( Who cares about swans, there is a plague of the damn things!) I expect you can hear such tales fom many sources.