Sharks do not have swim bladders. Habitat Sharks live in all seas. One kind even lives in the Arctic Ocean. Most live in mild or warm oceans. There are large numbers of sharks in tropical areas.
Many sharks migrate up rivers.
Some sharks live at the bottom of deep underwater canyons. Others live in shallow reefs only a few feet from the shore. Large sharks are found between 100 feet deep and the surface. Large sharks don't like to come close to shore. The largest sharks are filter feeders.