Deep-sea fishing involves catching fish and other marine life in the open ocean, typically at depths greater than 30 meters (about 100 feet). This type of fishing targets species such as tuna, swordfish, and shark, which are often found far from shore. Fishermen use specialized boats and equipment, including longlines and trawls, to reach these deeper waters. The practice can be commercial or recreational, with many fishermen seeking to provide fresh seafood for markets or enjoy the thrill of the catch. However, deep-sea fishing raises concerns about overfishing and its impact on marine ecosystems, prompting discussions about sustainable practices.