I thought fish were whacked over the head... or does the suffocation happen by having them overcrowded on the boats?

I think farmed fish are sprayed with pesticides and such, so I think it pollutes quite a bit, and they're in their pens so tightly that there's a concentration of refuse. Not pleasant.

We have a couple goats and some chickens, but they're happy, and will have had pleasant lives at the end of them.

Yes, i find it strange to be selectively vegetarian. I prefer to eat meat, but make as many better choices about it as possible, including raising my own.