They can't trust anything..they are not at that level of development. They sleep...they die. Simple. Brash physical trauma works as does a sharp knife.
I personally disagree with this. While I don't think all fish can feel "trust" I do think that some, like Koi and other long-lived fish can indeed learn to trust someone or something. In a manner, at least.
id rather my nose burn then freeze to death
And that is the key in this issue. It's all a matter of preference. Regardless of HOW you kill them, be it cutting their head off or freezing them or using vodka, the end result is the same: they die.
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