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Oh, I was told by my local vet that freezing the really any small animal (such as mouse, rat or even fish) was humane because they would just be cold for a minute or so and then fall asleep, and die.
Since fish are cold blooded, it is a natural function to sink into torpor as the temperature drops. I don’t believe they would feel discomfort if frozen, although a mammal most certainly would.
 
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