[javanix]

I wonder if the fish actually ended up helping with the mosquito population?

[wooyi]

Yes they would. Tilapia fries would definitely eat mosquito larvae in the water. There were likely smaller species like guppies that would totally keep the mosquitos in check.

[dredmorbius]

They can and do. "Mosquito fish" are a frequent mosquito abatement measure.

Put them in _any_ standing water. Old tires are a notorious mosquito breeding ground: small, hard to individually find, hold water, don't degrade.