According to a joint report by the FAO and UNEP, an estimated 640,000 tons of fishing gear are left in the oceans each year, accounting for one-tenth of all marine litter. These nets, sometimes called “ghost” fishing nets, can often be found on and around shipwrecks. These nets remain in the marine ecosystem for hundreds of years. Many marine animals are captured and killed in the nets, and this has a negative effect on marine ecosystems.