How to humanely kill a fish?

How to Humanely Kill a Fish. Three Methods: Preparing an Aquarium Fish for Euthanasia Preparing a Euthanasia Bath Killing Physically Community Q&A. If your aquarium fish is seriously ill, it's more humane to kill it than to let it suffer. A fresh-caught fish will inevitably feel some pain, but there are ways to minimize this and kill it quickly. read more

Many fish keepers advocate using clove oil to anesthetize fish. You must anesthetize them first with the clover oil and dispatch the fish with another method – you can also give them such a strong concentration of clove oil that the clove oil alone will kill them. read more

The following methods are not suitable for killing fish as they do not result in a rapid or humane death: chilling with ice in holding water, carbon dioxide in holding water; chilling with ice and carbon dioxide in holding water; salt or ammonia baths; asphyxiation by removal from water; bleeding out without stunning. read more

Injecting barbiturates into the fish’s bloodstream is another humane way to kill fish as they will slip into unconsciousness first and then on to death. The problem with this method is you will find it difficult, if not impossible, to get your hands on it since it's a controlled substance. read more