In the vast expanse of the ocean, the process of catching tuna is full of wisdom and challenges, and different fishing methods have their own characteristics.

longline fishing

Longlining is the more common form of fishing. The fisherman prepares a main line 140-150 kilometers long, to which are attached at intervals branch ropes with bait at the end. When the boat arrives at a tuna spot, the main rope is suspended at the surface of the ocean with the help of about 180 buoys, and the bait-rigged branch ropes are lowered to a depth of 200-300 meters. The line is deployed by means of a stern loading machine, which takes about 4 - 6 hours to complete, and usually 3000 hooks are deployed. After waiting about 3 hours for the hooks to be set, the main line is retrieved from the starboard side of the amidships foredeck, and whether or not there is a catch, the stanchions are taken off and coiled up for the next use.

purse-seine fishing

Purse seining is suitable for situations where schools of tuna congregate. Fishing vessels are equipped with advanced radar and sonar equipment to accurately detect schools of fish. Once the school is detected, the boat approaches and starts to release the net, with the head of the net going into the water first and the boat completing the net around the school to encircle it. The boat then tightens the sphincter and bottom ring to give the net a bowl shape, and then uses a power skid to lift the net. When the net reaches the retrieval section, the tuna are picked up with a plunge net, or with the assistance of a large boat, which pulls away the netting from the retrieval section and allows the bucket to pull the fish into the cold brine tanks for freezing. After that, the catches are first frozen in the saturated cold brine tank (-13℃ -18℃), then transferred to the cold (-20℃ -40℃) tank for refrigeration, and then transferred to the transportation vessel for transportation back to the country when the catches are fully loaded.

pole fishing

Pole fishing fishing is common in places such as the Maldives. Fishermen first prepare small silver-colored fish as bait, early in the morning out to sea, with high-power electric lights to attract small fish fishing as bait. Subsequently hung with bait, hooks exposed rod into the sea, tuna chasing bait, because of its fast swimming speed, easy to bite. The fisherman quickly throws the rod and lifts the rod at the moment of biting based on his experience and skill, and immediately puts the caught tuna into the cabin with ice to keep it fresh. Skilled fishermen can catch more than a dozen tuna a minute, and if they are lucky, they can even catch bluefin tuna.