Surface long lining
Surface long lines are used mainly in the tuna fishery. They consist of a main line that can be many kilometres long, supported in the water by a series of floats. Off the main line are branch lines up to 50 metres long. Each branch line carries a baited hook. There can be up to 3000 hooks on a longline.
The line is set as the boat moves forward, which can take from 2 to 6 hours. Once the line is fully extended, it is then hauled in. This process can take up to 12 hours.