Yes I am restricted to the triploid grasscarp in my area,theyre kinda expensive and with all the bear raccon wildcats feral cats eagles and whatnot I was hoping something cheaper could do the job,just in case they ended up as a snack.I have to assume the grasscarp survive the winters around here ok as they are in a lot of local ponds.I cant really run air bubblers as the pond is about 100 yards from the house.I guess Ill look into the grasscarp,as I wouldnt know where to get Megalobrama amblycephala or if they are even legal in my area.Might throw a few gf in the pond anyway just to see how they do.