I admit that I did not read the article...
If a scientist could prove that fish feel (or don't feel) pain, I would not understand his explanation.
All I can say is that animals do feel pain. I know this by their reactions to uncomfortable situations that they get in. Pull on your dog's ear good and hard: he/she will return the pain to your hand or at least yelp and cry. Is it the same pain as humans? - close enough! Do I feel sympathy? - some, not enough to keep me from feeding myself, but surely enough to not go around pulling dog's ears...
Genesis 9:3 - Every moving thing that lives shall be food for you. And as I gave you the green plants, I give you everything.
