I don't worry about them in my main pond at all. If I catch a small one I will clip the tail off and feed it to the LMB or CC. If I catch a nice one over 8" I will return it to the water to see if I can grow a big one.
Once you have a good population of LMB, the GSF don't seem to be a problem, at least in our area.
The problem they cause is when they jump the gun on stocking a new pond and end up dominating the pond. Then the fish that get stocked just become expensive snacks for the GSF.
