A longliner is a type of fishing vessel that uses a long line with baited hooks attached at intervals to catch fish. This method is effective for targeting various species, including tuna, cod, and halibut. Longlining can be done in both deep and shallow waters, making it a versatile fishing technique. The longline itself can stretch for miles, with thousands of hooks deployed. While it is efficient, longlining can also lead to bycatch, which includes unintended species like sea turtles and sharks. To mitigate this, regulations and best practices are often implemented to promote sustainable fishing.