I know a lot of people are not very knowledgable about science, but I don't understand why scientists would be surprised that non-human animals feel pain. This very fact shows that humans aren't as much smarter than other animals than we want to think.
WEST LAFAYETTE, Ind. - Fish don't make noises or contort their faces to show that it hurts when hooks are pulled from their mouths, but a Purdue University researcher believes they feel that pain all the same.
Joseph Garner, an assistant professor of animal sciences, helped develop a test that found goldfish do feel pain, and their reactions to it are much like that of humans. A paper detailing the finding was published in the early online version of the journal Applied Animal Behaviour Science.