Hi..just to help out....ice crystals and bursting cells are long after death occurs. Applying ice to your skin is not a comparison. Skin insulates our body and when you do it...you are applying it to a local area. As a human, you can't make that comparison. The size of a fish is so small, that, the rapid drop in temperature is so quick, brain function stops almost instantaneouslyas does the perception of pain. To those that think of the 'painful ice on my skin' scenario, think about the 'unable to move/breathe but conscious scenario'. IMO, that is what happens with the oil of cloves...you have local anesthesia but not loss of consciousness. The two times I have used this, the fish stopped moving instantly and appeared dead. To The -Wolf, no, I'm not an ichthyologist, and I don't present myself to be an expert as such, but certain principals of physiology are constant. As a last example, the first drug used in capital punishment cases is thiopental...followed by an overdose of potassium. Thiopental causes deep unconsciousness, potassium causes cardiac standstill. I'm not convinced the oil of cloves does it. As for the cold water fish, this is a tropical fish forum, and this is what I've been referring to.
In the final analysis here, those people who choose to euthanize their fish, are doing a dignified thing. How you chose to do so should be a matter of availability, ease, and comfort. I think both methods are probably as humane as you can get......SH