Leo, isn't the danger from too much tilapia or any other fish the amount of mercury or other toxins which accumulate in it from the water? I am going to have my water tested, but a water treatment guy in my neighborhood said that we have very low levels of contaminants here because it is very wooded and has never had any energy production or large-scale farming in the area.

Fish n chips, thanks for the link. Mnfish, thanks for the numbers. Maybe I'll have to lower my expectations to 1 fish per week. RC, I think that BG might be a good idea with maybe 1 or 2 LMB to keep them in check. Does anyone know how much food a bug zapper over the pond could realistically provide in a wooded area?