There are those who think fish are emotionless and painless. However, do fish feel emotions?
Fish certainly feel feelings. At least, that's what researchers have found after testing a wide variety of species.
Fish that spend most of their time in the tank's bottom half are likely nervous or depressed.
Many people believe that fish do not experience "depression" or "anxiety" on the same level that humans do.
Because of their presumed lack of a developed nervous system and the inability to communicate pain, fish have long been held to be pain-free.
It's easiest and most responsible to say fish might experience pain for now. They may experience pain, but it would be very dissimilar to the kind of suffering a person would experience.
It seems that fish experience a range of feelings. They do not, however, feel them on a human-typical level.