Last hours? You've never culled much have you?
Fish in minimal quantities of water - into the freezer - are dead in very short order (but don't forget about them, wives tend to object to fish-sicles). And they don't generally freak out, they are cold blooded - as they get cold they just start getting real slow - then they stop breathing. Done.
Culling FW angels lately, I've taken on a friends tactic - straight into a bucket of ice/water. Dead in seconds.
Andy
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