This brings back such bad memories...
Do not read this thread. Ok, the real answer is that many of us have Gams in our pond. I added them primarily for mosquito control. There seems to be pros and cons related to them.
Pros:
They do seem to control mosquitos (at least they seemed to have a significant impact at my place).
Their breeding habits puts rabbits to shame. DIED added I think 11 to his pond and he now has schools in the thousands.
Cons:
They may eat the eggs of other fish or at least I recall a discussion of that (I'll try to find the link).
What is the purpose for adding the Gams? Mosquito Control, forage base, both?
Fun quote from a wise and all knowing Heybud:
It is better to have loved a gam and lost than to never have loved one at all.