Clove oil is a great way to anaesthetize or euthanize a sick fish humanely. Clove oil can be bought at most pharmacies and is very cheap.
To Anesthetize: Clove oil should be dosed at 1 drop per 1litre of water for small fish and 2 drops per 1litre for larger fish ~4 inches. The fish should not be in the clove oil for more than 1-2 minutes.
To Euthanize: To Anesthetize: Clove oil should be dosed at 3 drop per 1litre of water for small fish and 4-6 drops per 1litre for larger fish ~4 inches. The fish should be in the clove oil until it stops breathing.
The clove oil should be mixed in a separate container of warm water until it creates a milky emulsion. The fish should be put into a container outside of the aquarium. Once mixed add the clove oil to the container with the fish.
Th fish will breathe slower and roll onto its side or back. Once this has happened it is anaethatised and can be worked on. To bring the fish back to consciousness put it into fresh aquarium water and it should recover within 1-5 minutes.
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