Because Nagasaki Prefecture's sea area is located farther north than other areas in Japan, the sea temperature is lower and it takes longer for tuna to grow. In addition, Nagasaki Prefecture and the Nagasaki Tuna Farming Council are working together to promote the production of high-quality tuna, and producers in the prefecture are going through a trial-and-error process under the guidance of the Nagasaki Prefectural Fisheries Experiment Station to produce tuna that meets the needs of consumers.