[SIZE=larger]Clove Oil (contains eugenol)[/SIZE]
[SIZE=larger]Clove oil is a sedative which at high doses, can be used to euthanase small fish. Unlike veterinary anaesthetics, clove oil is readily available from most chemists. Around 400 mg of clove oil per litre of aquarium water is sufficient to cause death in exposed fish. The clove oil should be mixed with a little warm water first before adding it to the water and fish slowly. Do not add all at once as fish get excited - add the clove oil mix over a 5 minute period.[/SIZE]
[SIZE=larger]When exposed to clove oil at this concentration fish quickly lose consciousness, stop breathing and die from hypoxia. Please note that the concentration of the solution must be appropriate and the fish must remain in the solution for at least 10 minutes.[/SIZE]
[SIZE=larger]Studies have found clove oil to be similar to the anaesthetics MS-222 and Benzocaine hydrochloride.[/SIZE]