Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Finally, the Fish Kill Took Place!

Definately, if the flap opens for the water to get out, carp can get in by swimming upstream. You'll probably not find any live Gizzards, they will die with lower doses of Rotenone than common carp. If she's still seeing carp, then I would have them come out and hit it again. If you can get the carp population down, even tho they're not 100% eliminated, if you can get a good predator base in before the spawn next Spring, you may be able to keep them in check for a longer period of time.

If you can find someone that knows how to fish for carp, and is willing to do so this year, the more you can get out before they spawn next Spring, the better.