Nobody likes to be around a moody mackerel or an abalone with an attitude.
Yes, a fish has a central nervous system and yes, he or she can feel the pain of a hook in his or her mouth. I like them pan-fried in a light batter. Some people say that they can hear a lobster squealing as it is put into a boiling pot. Some people can also hear a goldfish clear its throat from across a crowded room. Remember, in those days they didn't come with rubber bands around the claws.