>> similarly as some vegans are saying that oysters can be eaten since they're sustainable and clean the oceans
Never heard that argument, but it seems like a misunderstanding. Peter Singer made the point that oysters have no nervous system and are therefore as plant-like as animals can come and probably non-sentient. The fact that oysters clean the oceans would also be a pretty strange argument. That's why there are so chock full of contaminants and pathogens in most places and many countries have special allowances to make them street legal when virtually any other food with the same toxin contents would be banned.
Never heard that argument, but it seems like a misunderstanding. Peter Singer made the point that oysters have no nervous system and are therefore as plant-like as animals can come and probably non-sentient. The fact that oysters clean the oceans would also be a pretty strange argument. That's why there are so chock full of contaminants and pathogens in most places and many countries have special allowances to make them street legal when virtually any other food with the same toxin contents would be banned.