This is why you just shoot them in the head with a harpoon when you take them out of the water
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rule #1: be kind
I remember there was a study done on how to best slaughter swine (pigs).
The methods that were investigated included: a mechanical hit on the head, suffocation in CO2, and some other measures.
What was found was not only that the suffocation method caused significant stress in the animals, but also that the meat collected this way tasted way worse than meat collected through other slaughtering methods.
this could be relevant in this case: if fish suffocate slowly to death, meat producers might have a financial incentive to change that, to be able to sell better-quality meat, possibly at a higher price. anyways, it would make for good advertisement. that is why meat-producers (fish-producers) should take this seriously.
I have a crazy idea here. Now hear me out, this is gonna sound like a wackadoodle idea, but,...... how about we don't murder the animals? Crazy, I know.
But I’m hungry
And the reason we still use CO2 slaughter instead of something like Nitrogen is because.... They already have machines built for CO2 and just don't want to pay the cost of changing practices.
Pure greed and laziness.
They just know people will buy the meat no matter how much the animals were abused so why would they bother? Even those who see themselves as animal lovers happily look the other way with every purchase. The industry has all the incentives to be exceptionally cruel so of course it is.
Also co2 is easier because you can fill a pit with it, nitrogen will just float about and disperse.
Stress is a hell of a drug
So what you're saying is that Kurt Cobain was wrong and it's actually not OK to eat fish because they do, in fact, have feelings?
Something in the way…