The best and most humane way I have read is a mixture of Clove oil and tank water..
Quote:
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Oil of cloves is readily available at most health food stores and is often used as a way to anesthetize koi and goldfish. In a container filled with enough pond water to cover the fish add 1 teaspoon per gallon. If the fish is left in too long it will put the fish into an eternal sleep.
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I found this answer after about 2 minutes looking on the net?
so it is right out the
http://www.ponddoc.com/WhatsUpDoc/Fi...nization.htmre.