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Message: <blockquote data-quote="Dave Jay" data-source="post: 127320" data-attributes="member: 27677">This debate is never-ending in the fish keeping world. People are steering away from freezing and turning more to CO2, using soda water as the source. Personally for fish I think that would be stressful too, essentially suffocating. Clove oil is recommended by the rspca, as is spiking(spike through the brain).The method I had used for years is cooling in the fridge until comatose, then freezing to kill, in that way there is no stress or pain from fluids freezing, they have already slowed down and slipped into a comatose state before being exposed to freezing temperatures.(edit- I should state that the fish were bagged as though to travel, therefore the water would gradually cool down)I have tried carbon dioxide with a pigeon and there was a lot of thrashing about before death, not something I would care to repeat, far from slipping quietly away as I was advised.I haven't been faced with having to euthanase an invert yet, but I have accidentally killed crickets through leaving them in the fridge too long. Some revive when warmed up, but when left too long in the fridge the majority have actually died from the low temps. I guess when faced with it, I'll probably use the fridge then freezer method unless I find something better.</blockquote>