Today I took my three Tanichthys albonubes, white cloud mountain fish, from the indoor aquarium in which they overwinter, and put them in my outdoor fish pond. It's just a round rubber horse trough, probably only about 15 gallons, but they thrive in there all summer eating mosquito larvae. These three fish are the survivors of about a dozen that I bought about eight years ago. They much prefer life outdoors, getting fat and sassy from all that live food.. I won't see much of them until the fall, when I drain the tub to find them and bring them in.
There are many, many mosquitoes in the yard, so those fish will not go hungry.