Up Methods of Harvesting Tuna POLE AND LINE is one of the principal means used to catch TUNA commercially. Fishermen on the boat drop lines with barbless hooks into the school of fish, and bring them aboard as they are hooked. Forty percent of the world's commercial TUNA is caught this way.
Weights carry one edge of the seine deep into the water.
When the fish are surrounded, the bottom of the seine is drawn together or pursed, so that the fish are trapped and hauled aboard the boat. Branch lines attached to the long line are sunk with baited hooks to depths of 55 to 150 meters. It may take as many as 20 hours to set a line, and longer to retrieve it with its catch. This site is optimized to work with msie 4 or above Please click here for Terms and Conditions of use regarding this site.