Comment by Gravityloss

We had a small garden pool at the summer cottage, emptied every winter. Pretty soon after filling it was full of mosquito larvae. Didn't see any dragonfly larvae, I assume the eggs only hatch in the spring so the emptying makes it impossible for their life cycle.

We caught some fish and put them in there. They quickly ate the mosquito larvae. In the fall the pool was emptied and the fish released back to the lake.