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Spatial distribution of Todarodes pacificusfishing areaThe yellow areas in Fig. 8 were extracted by 2-levelslicing methods (see ‘Materials and methods’) and representfishing-vessel lights, particularly those fishingfor Todarodes pacificus. The fishing areas were mainlyaround the Tsushima Strait in January, extending toUlleung Island along the east coast of Korea and theOki Islands near the Japanese coast. February andMarch showed similar spatial patterns in fishing area.Their extent, however, seemed smaller than in January.In April, fishing areas spread into 2 branches at latitude36°N, longitude 127°E, with 1 branch locatedalong the east coast of Korea and the other alongJapan’s Honshu Island. The patterns visible in Aprilintensified in May, especially in Korean waters. InJapanese waters, the fishing areas in May extendedfrom the Oki Islands to Sado Island.In June, a squid fishing area formed along the northernedge of Yamato Rise, and the northern edge of thesquid fishing areas along the Japan coast had extendedto the western Tsugaru Strait and to waters offsouthwestern Hokkaido. In July (Fig. 8), fishing areascontracted and disappeared along the Japanese coastfrom the Tsushima Strait to the western Tsugaru Strait,and reappeared in northern areas off the Hokkaidocoast. Although the fishing areas in August generallyresembled those in July, the fishing area along theHokkaido coast disappeared in August. Septembersaw an increase in fishing areas, especially around theYamato Rise, the east coast of Korea and Japanesewaters from Tsushima Strait to the Oki Islands. Notethat September fishing areas spread continuously fromUlleung Island to the western Tsugaru Strait andacross the Yamato Rise.
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