this post was submitted on 12 Sep 2024
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The original article. Bivalves' nervous systems can be summarized as follows:
It's first and foremost incorrect to call yourself vegan if you eat oysters; the commonly accepted definition by the Vegan Society is just objectively contravened here. But semantics aside, as noted in the article, the question becomes "is there something wrong with it?" I definitely think there is. Bivalves are still shown to proactively avoid noxious stimuli in the way a more developed nervous system might, and while the existing research is too sparse to definitively call it "pain", this feels like yet another step in a long, storied history where humans decided animals didn't feel pain until researchers stepped in and found out yes, they definitely do (see, e.g., fish). It's easy not to eat them, and it's pretty ridiculous to treat the waiting period for more robust scientific literature as a "grace period" instead of something that should be treated with caution. Getting it out of the way, because it's often presented in bad faith, the whole "plant pain" argument is absurd on its face, both because a basic understanding of entropy still means veganism would be the way to go even taking that asinine premise at face value (vastly more plants per calorie for meat than simply via directly eating plants), and more importantly, plants lack a nervous system at all. They don't feel pain, and the argument exists 5% to be sincerely believed by nutjobs and 95% to soothe cognitive dissonance felt by people who pay to have animals feel pain.
Honestly, bivalves were the last thing I gave up before becoming fully vegan, even after dairy and eggs, mainly, as you've pointed out, due to their very simple CNS. I found the "we don't know yet, and it's better to be safe" argument, as well as the fear of being purity checked by other vegans, convincing enough to stop eating them. Being vegan already makes you a bit of a social pariah, so I don't need the trouble from both sides.
However, I personally believe that sentience and consciousness exist on a spectrum which is also roughly correlated to CNS complexity. That spectrum dictates how much a living thing is capable of suffering, and hence how much moral consideration they should be afforded.
"Vegans" eating bivalves is so incredibly low on my list of things I care about, it might as well be nonexistent. Let anyone who only eats produce from a veganic farm throw the first insult.
Regarding your last paragraph, I broadly agree. I've said before that I could see this becoming a weird wedge issue in the far future where humans have finally reached a broad consensus against exploiting mammals, birds, fish, etc. for food but where maybe now the main ethical cause is against the exploitation of insects. And within those who oppose insect exploitation, you hypothetically have a split over whether the line is at animals or whether it's at having a CNS.
For right now, I think it's very low on the list of priorities because "Does a cheeseburger justify perpetuating unimaginable suffering on an unfathomable scale? Discuss, and if you say 'no', then you're an extremist weirdo." is where the Overton window is at right now. Nonetheless, going around telling a major newspaper to write a human interest story on you advocating the position that eating animals is vegan unambiguously deserves pushback.
As an aside, oysters are not bivalves, they are brachiopods. Brachiopods do have a nervous system - some even have eyes.
What's the difference and how do you tell a brachiopod from a bivalve? It's the plane of symmetry. In bivalves the plane of symmetry is where the shells (also known as valves) join. So bivalves have two identical shells. Whelks and razor shells are bivalves. Brachiopods also have two shells, but the shells are normally quite different. The oyster for example has one big concave shell and one small flat one on top. The big shell has a hole at the apex (just next to the hinge) and a root-like anchor grows from it to bind the brachiopod to the matrix on which it lives. Brachiopods have an axis of symmetry from this root/foot that vertically separates each shell into two mirrored parts.
It's always been my understanding that oysters are bivalves.