Venomous fish have evolved many ways to inflict pain
There may be compounds in fish venoms that have medicinal uses

SEA OF HURT A venomous reef stonefish (Synanceia verrucosa) is camouflaged as a rock in the Indian Ocean. Stings from the spines of this species are very painful.
REINHARD DIRSCHERL/SCIENCE SOURCE
Biologist Leo Smith held an unusual job while an undergraduate student in San Diego. Twice a year, he tagged along on a chartered boat with elderly passengers.