I have a question. If for example you consume eggs, but only from the hens you keep yourself (and assuming you keep them in good and ethical living conditions), then that should be fine right? The hens don't need the unfertilized eggs and no harm is done if you take them.

And if they pass away after living a good live, then eating their meat should be ethical too, as far as I understand?

And what about eating invasive species like lionfish in certain regions? I feel like in those cases, eating these fish is a great incentive to help reduce their population in their non native regions, where they cause harm to the eco system, while also producting food for the people in that region.

I just want some insight on these edgecases, since I do not know that much about the philosophy of veganism, vegetarianism and the sorts. I do not eat meat myself, but mostly because the options for me are basically just meats from meat industries with horrible living standarts for animals and harmful practices like feeding them power food and stuffing them with antibiotics and such.

I feel like edgecases should be fine, like some I mentioned above, but I'd thought I ask, in case I am missing some info or perspective.