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From The Aquarium Wiki

Euthanasia is the deliberate ceasing of an animals life functions in a painless way so as to relive the suffering of the animal when medical aid has not helped.

In the aquarium hobby various methods are used. Here is a current list.

[edit] Recommended

In order of merit

• Anaesthetics (Finquel, Tricaine methanesulfonate (TMS), Benzocaine hydrochloride, MS-222, etc.)
• Carbon dioxide (via airstone, Sodium bicarbonate (Bicarbonate of soda, baking soda), Health salts (Alka-Seltzer))
• Clove oil

[edit] Not recommended

All these methods stress or hurt the animal before it dies.

• Freezing or boiling
• Alcohol
• Physical violence (Sudden blunt trauma, Decapitation, Pithing, etc.)
• Flushing down the toilet

• Certain species of fish and amphibians can survive in extremely low oxygen environments so the use of CO2 may not be a quick method for anaesthetizing.

[edit] Links

• Wikipedia
• The Gab on Euthanasia
• FishDoc on Euthanasia Treatments
• Euthanasia guidelines PDF file from the American Veterinary Medical Association’s (AVMA)
• RSPCA and the use of CO₂
• The Krib on Euthanasia
• Fish Slaughter, Killing, and Euthanasia
• University of Washington Policy for the Euthanasia of Fish Species
• Euthanasia for Amphibians
• Don't Flush That Fish!