Fish feel pain they possess the nerve endings which send impulses to their brain which they sense. The more damaging the stimuli the more frequent the impulses to the brain are and the more unpleasant it is for the fish. This pathway is not an untested theory it is how it actually works. Fish can see they have eyes, fish can smell they have noses, fish can feel pain they have a central nervous system with a sense of touch. What is in qusetion is do fish process this pain stimulus intellectually and emotionally in the same way as higher organisms (like humans) do? Given their small brains and w