Hi Cris,
I find our comments inetesting in that I took a unit based around morals and ethics. We directly looked at why all states animal cruelty acts excluded fish. Several studies have been conducted (involving the firing pace of neurons when stimulated and when not for example) and there is a wide variety of ancedotal evidence to support the theory that fish do not have the advanced nervous system needed to feel pain that 'higher' vertebrates have. I am not saying that it is ok to gut a fish alive simply that it is widely believed that there is a big difference. Take Pavlov's dogs for instance vs say fish that get released and then immediately rehook themselves. Some people debate that this is simply because fish do not have the ability to remeber the event and associate it with the hook - others rebuke this saying that if the fish has not recognition of the 'pain' then it as good as does not feel it.
Let me assure you that a snake, even one which is placed in a fridge for a few hours beforehand would feel everying - just because their neurons are firing at a slower pace does not mean they are numb, but simply that the pain message to the brain is delayed. After the excision the pain would increase due to the highly innervated areas around the head and eye regions.
Hope this helps people understand why this practice is so abhorrant, as it would be in any other animal.
SL