Hi Nik,

We have mosquito fish as well. Seldom do fry get through, even with
lots of lilies and plants in the pond. With 20+ koi and goldfish in
our pond, it is a good thing they don't make it! We sometimes have a
few new ones...but seldom.

Our mosquito fish handle the winters easily...even 3/4 inch of ice.
Any winter diminution of numbers is quickly made up. They do, of
course also eat their own fry. We keep them in all of our water; berm
ponds, water fall pools and filter barrels. No skeeters.

Jim