Wintering schools originate in the wintering grounds of bony fishes. Various species of bony fishes may congregate into areas with appropriate environmental conditions for survival during the winter months. These schools often disband after the winter season. Bony fishes have sharply contrasting territorial behavior. Among the slowest-swimming bony fishes are the eels.
Many bony fishes spend most of their time lying on the ocean bottom.
The caudal fin is the fin most commonly associated with swimming, but many species rely on other fins for propulsion. D. Sound production. Many bony fishes produce sound, sometimes in association with reproductive, social, territorial, or aggressive behavior. Depending on the species, a bony fish can produce sound by rubbing its teeth together, vibrating its swim bladder, or by flexing and contracting muscles. E. Symbiotic relationships.