What does deep sea fishing mean?

Deep sea fishing is a type of fishing that is done in deep water, typically in the ocean. It is usually done from a boat and involves the use of heavy-duty fishing gear and tackle. Deep sea fishers typically target large, predatory fish such as tuna, marlin, and swordfish, although other species such as deep-sea cod and halibut may also be caught. Deep sea fishing can be a challenging and rewarding experience and is often considered a sport.