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May 24, 2016 at 21:11 comment added Ilmari Karonen There are some native fish in Scandinavia, such as the crucian carp (ruda in Swedish), that can survive even in ponds that freeze (nearly) to the bottom in winter. They'll eat pretty much everything, including insect larvae, so they should be at least some help in controlling mosquitoes. Do note that crucian carp tend to outcompete other fish in small ponds, and can be hard to eradicate once present. If your pond already has an existing fish population, think twice before introducing them.
May 24, 2016 at 13:39 comment added Chris And please: Do not release any fish and mess up the eco system of the lake.
May 24, 2016 at 13:38 history answered Resonating CC BY-SA 3.0