QUOTE : Why then, for so long, have humans just assumed -- or perhaps hoped -- that fish feel no pain and are essentially mindless? Balcombe thinks the problem is our inability to read their expressions or emotions. There's no sympathy trigger. 'We hear no screams and see no tears when their mouths are impaled and their bodies pulled from the water,' he writes. 'Their unblinking eyes -- constantly bathed in water and thus in no need of lids --amplify the illusion that they feel nothing.' Many do in fact vocalize when they are in pain, but the sound is designed to be heard under water, and we can't hear it.