Yes, Melissa, there are getting to be more places where you can buy fish that are sustainably grown and caught. Personally, I shop for fish for my fish tacos in an Oriental grocery store and usually buy a fish that is swimming in a tank. After the fishmonger kills and dresses it to my directions, I take the whole thing home and I use the fillets for the tacos and the rest for fish stock. I even sometimes bury the fish heads and tails in my garden like the Native Americans did and plant corn or squash!
These fish tacos are also extremely good with tofu, and you can get firm tofu that can be cut into strips and broiled or fried, seasoned, and sprinkled with sesame seeds, which is very delicious!!
Personally, I eat all kinds of meat and plant foods, with reverence, and only what I need. I love animals, but I love plants just as much!!