Please do not tell folks to put their goldfish (or koi) in the freezer. It is not the most humane way to euthanize them. Clove oil, an anesthetic available at pharmacies, at health food stores and online, is the most humane thing to use. (There are instructions on the Internet, but begin with 10 drops per gallon of water. More clove oil may need to be added after 20 or 30 minutes if the gills are still moving.)
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