12-17-2012, 10:12 AM
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I have fish tranquilizers for shipping fish. I get add four of the tablets to a cup of water, and add the fish. Although its not a 'lethal level" of tranqualiser, extremely sick fish seem to die after an hour or so. Just to be absolutely sure, I place the cup of tranquiliser and 'dead' fish into the freezer for 24 hours.
Basically, if a fish hasn't eaten or improved in two-three days, I euthanize.
Sorry about your fish. If you have access to clove oil and vodka, it's the preferred method. I would mix up "fish anaesthetic". 1 part clove oil, 8 parts vodka, should do the trick, and add 1 drop to the fish's cup. If still alive in 10 minutes, add another drop. For more comfort, add a drop of hydrogen peroxide to the fish's cup. (adds oxygen)
If you're able, wrapping it in a wet cloth, holding its body securely and slamming it on a table (or decapitation at the base of the spine) is widely used. It is technically faster and possibly more humane than clove oil & vodka.
If both of these are not possible, then freezing can work. Add a cup of plain aquarium water to the freezer, and freeze until a 'skin' of ice forms (maybe an hour). break and remove the surface ice, add the fish, and place back in the fridge or freezer. The shock off hitting the cold water should kill it instantly, but placing the fish in the freezer after makes sure its not just a deep hibernation.
Last edited by redchigh; 12-17-2012 at 10:26 AM..