Hello Craig my name is ***** ***** I will help you with this
Who owns the actual lake itself please?
Ok, then they are correct. You have a right to fish, but from the side.
If you have constructed something on the lake, then it sits over the lake bed, which is their land.
Unless you had then for 20 years in place then you have no rights.
I am sorry that this is not the answer you want, not the one I want to give you, but I have a duty to be honest.
Can I clarify anything for you about this today please?