Pond Boss Forums GENERAL QUESTIONS Pond Boss Box of Quackers!

It depends on 1) what they eat (obviously fish eaters like mergansers have an affect) and 2) how many there are.

Ducks do introduce fecal matter and hence organic material into a pond, although much less than an equal number of geese do. If you have too fertile water, they could push you over to having a classic Summer fishkill. But 1-2 pairs of (non-fish eating) ducks per acre of water have usually been judged acceptable and not a problem.

I am always happy to see a few mallards on and around my ponds.