In an experiment in Ireland, goldfish were pricked with a pin. Responses from this painful event were measured in the spinal cord, and in the brain, from the cerebellum through to the telencephalon (forebrain), where it is thought that fish feel pain.
Responses were also found when a heated prod was used.
The speed of the response suggested that the pain nerves were A and C fibres, which are known to be used in pain transmission in people.
The research shows that there is a neural pain pathway from the peripheral nervous system to the central nervous system, including the brain.