Water Gardening: Mosquito fish and goldfish, 1 by MrJohn

MrJohn wrote:
TARogers -
How to get rid of tadpoles:

We put a new pond in at the neighborhood elementary school last summer. Before we could buy plants or fish, a teachers son drop two perch in about 1.5 inches long as a "gift". We found one dead in the skimmer a few days latter and never saw the other one again and presumed it was dead also. Later we put a dozen tadpoles in when we stocked with goldfish. We never saw them again, nor did we see any frogs. This spring a sharp-eyed student spotted a "black" fish (as opposed to gold). It was a five inch perch! The little bugger had been hiding for 8 months after eating all our tadpoles.... Needless to say, we removed him/her to the wild.

So that's one way to get rid of tadpoles.