The purpose of the cattails or other shoreline cover would be to make it so that the pond could only be fished by boat. My thoughts were that I would keep a boat there chained and padlocked to a tree. Only those who I give a key will be able to utilize the boat and most others won't be willing to carry one in for a 1/4 mile.
A friend of mine suggested planting Hawthorn trees around them, but I'm not sure I wanted to introduce a tree like that anywhere close to a farm field.
Trespassing is a major problem around here.