I grew up doing a lot of diving, I'd put myself into the ocean, there were sharks and other dangers, but I caught my own fish and I never ever felt bad about it. I could selective take what I needed, I'd never take a mother / pregnant fish if I could help it. I could tell most of the time.

You also get to see how the wild world works, and most fish would prefer to be taken by a skilled spear fisherman than have their face mauled off by a squid, at least as far as I could tell.

Unfortunately we live in a world with 9 billion people on it, which means we don't have the room to grow and harvest all our own food. In my opinion, that's the issue. Sourcing all our food "ethically" is basically not possible.

I'd much prefer to be producing and hunting my own food.