An estimated 73 million sharks around the world are killed every year, primarily for their fins, which are used in the Asian delicacy shark fin soup. Too often, fishermen slice off the valuable fins and discard the bodies at sea. This wasteful practice is known as "finning". Finning was banned in all U.S. waters in 2000, but loopholes in the law hamper effective enforcement. As a result of this high demand and lax fishing limits, many shark species, including hammerheads and makos, are now threatened with extinction.