Abstract The Pacific saury ( Cololabis saira ), a key pelagic fish in the Northwest Pacific, exhibits autumn migration modulated by Kuroshio–Oyashio Extension mesoscale features, yet daily fishing ground variability remains unexplained. Traditional reliance on remote sensing data has limited understanding of the three‐dimensional mechanisms governing the fishing patterns. Through integration of continuous mooring observations with satellite data, we reveal how multi‐scale oceanic processes drove an anomalous southward shift of Pacific saury in November 2016. Key findings demonstrate that: (1) Anticyclonic eddies enhanced the Oyashio intrusion, shaping the corridor for the southern fishing grounds; (2) Synoptic winds better explained the daily fishing vessel distributions than chlorophyll‐ a ; (3) Westerly winds enhanced Pacific saury's feeding conditions by intensifying cold tongue–eddy interaction through Ekman transport. This study underscores the importance of synoptic‐scale winds and continuous subsurface observations in understanding the three‐dimensional evolution mechanisms of fishing ground, advocating for expanded mooring establishment for sustainable management.
Zhang et al. (Sun,) studied this question.