Some bony fishes can tolerate high salinity levels. Some species of gobies can tolerate salinity levels as high as 60 ppt. In general, fishes rely on oxygen dissolved in water for respiration. Some species of bony fishes require large amounts of dissolved oxygen. The lungfish must have access to the water's surface.
Most bony fishes have small home ranges.
Food and habitat availability, reproduction, environmental cycles, and temperature change may be causes of migration for some species. Some species of bony fishes migrate great distances. Diadromous bony fish species migrate between fresh and marine environments. Catadromous fishes migrate from freshwater environments to the ocean to spawn. Anadromous fishes migrate from marine environments into freshwater environments to spawn.