How To Euthanize A Fish Humanely. In each case, it was going to take anywhere from a few minutes to a few hours for him to pass away. Learn how to euthanize a pet fish using the following steps:
Place the fish in a modest amount of water so that it may recline upright and comfortably. First, anesthetize the fish with clove oil so that it is sleeping and unable to feel pain; Flushing a fish does not kill it quickly.
If you don’t know how to pith a fish, then don’t use this method.
If you have a sick fish that is lying on the gravel unable to move for more than 24 hours it is likely a good idea to euthanize it. While too difficult for most aquarists, stunning a fish, decapitating it and then pithing it (physically destroying the brain with a metal rod) is a humane way to euthanize a fish. Learn how to euthanize a fish with clove oil: Another humane way to euthanize your fish is through the injection of barbiturates, a commonly used sedation and euthanizing type of drug.