Do Siamese fighting fish fight? March 14, 2012 by Pamela Landy · Filed Under: Animals The males of the fighting fish species do indeed fight. They nip each other’s fins and show off their extended gill covers and intensified colors. Their battles are exciting enough that the Thai have domesticated the fish for use in contests. Related PostsHow do you tell the age of a fish?How old is the species of fish known as the coelacanth?What kind of fish is a sardine?Do fish sleep?How do archer fish shoot their victims?