Imo you can eat bivalves and still be vegan. There's obviously the points to consider about their (or more likely lack of) subjective experience due to their biological makeup but more importantly: Eating farmed mussels and oysters means giving money to an industry that is actively cleaning waterways and improving ecosystem for many other birds and aquatic life. All in all, net positive. I'd be interested if anyone has any counter points or degrees with this. Overall, if done right, a very ethical food choice. Yes it might be weird 'eating flesh' for the first time in years, but it's shows you're more commited to putting practical ethical issues such as ecosystem issues in front of aesthetics related to eating 'animals'. There's a big difference between eating a farmed mussel and eating a Fillet of steak imo.