>Do you believe it’s fine to kill a bivalve, as they feel no pain? Are you a bivalvegan?

Yes actually! At least I am fairly confident that oysters and mussels feel no pain, as they have no nociceptors. Clams and scallops I am less sure about because they’re motile but I know other welfare-focused vegans who do eat them.

But that’s interesting about barnacles, I didn’t know they were crustaceans—to wikipedia I go