As a pet owner, having to euthanize a pet is never something you want to have to deal with. However, it may be necessary that you may sometimes have to make the decision to euthanize your pet, especially if you are keeping pet fish. Fish are prone to a number of diseases, many of which can result in a gruesome death for your fish. Euthanizing a pet fish is often sometimes the only course of action you can take to ensure that your fish does not have to experience the more serious complications of a fatal disease. In addition to this, euthanizing a pet fish can sometimes be the best way to control a contagious condition that can sometimes spread to other fish in your aquarium.
WHEN IT’S BEST TO EUTHANIZE A FISH
There are certain diseases that can affect fish that will sometimes progress to the point that they become incurable. An example of this is dropsy, which is usually only visually detected in a fish after their internal organs have already been severely damaged. Since dropsy may be contagious to other fish in the tank, it’s often recommended that you isolate the fish that has become infected. If you notice an epidemic of a lethal disease spreading in your tank, it’s often best to simply euthanize any infected fish as soon as possible, in order to prevent further spreading of the disease.
HUMANE METHOD #1 – ANESTHETIC OVERDOSE
This method uses a substance called Tricaine Methanesulfonate, or TMS. Commercially, this is a substance that goes by the name of MS222 or Finquel. Most pet care supply stores carry this substance, and it can be purchased online for approximately $10 – $25. According to most aquatic fish experts, euthanizing the fish can be accomplished simply by doubling the dose that you would normally use for anesthetizing the fish. Since this substance is FDA approved, it has been shown by many people to be a painless, effective way to humanely euthanize a fish.
HUMANE METHOD #2 – CLOVE OIL AND VODKA
Contrary to popular belief, the use of clove oil alone is usually not enough to safely euthanize a fish. Also, it’s very important to remember that clove oil should not be used at the same time as the vodka.
- Begin by removing the fish from the main tank (if you haven’t already) and placing them in a small container with some tank water. Make note of how much tank water you use to keep your fish, as this is important for maintaining a proper ratio.
- Fill a small jar (such as a baby food bottle) with tank water. Put one to two drops of pure clove oil into the jar, shake vigorously.
- Pour ¼ of this mixture into the fish’s enclosure. After approximately ten minutes, the fish will fall asleep, sinking to the bottom of the container.
- Once the fish is sleeping, add pure white grain alcohol that is approximately 20 to 20% of the total water volume in the fish’s enclosure. Wait 20 minutes.
- Carefully check the fish’s movements after 20 minutes. If there is no movement in the fish’s gills, they have quietly expired. If they still have some gill movement, add more grain alcohol until their movement ceases.

Sun, Nov 1, 2009