Fish feel pain
"I've come to the conclusion that they deserve equal moral consideration with all the other vertebrates -- that includes the furry ones and the feathered ones, as well as the scaly ones. I'm a longtime vegan and vegetarian, and I can talk to other vegetarians who almost laugh at the notion that they're asked, 'You eat fish, don't you?' We draw this line.
"The fact is that they literally and figuratively live below the surface of our consciousness. They're out of view. They have glassy, staring eyes. Well, you don't need to blink when you're in an aquatic medium -- that probably works against them. They make all sorts of sounds underwater, but in the air most of those sounds don't transmit, so we think maybe they're not feeling pain.