Beijing’s use of civilian fishing vessels as a quasi-military instrument is not new, but the scale of recent activity in the waters north of Taiwan has moved the People’s Armed Forces Maritime Militia (PAFMM) from a nuisance force into something closer to a strategic asset under active development.

The clearest signal came earlier this year, when remote-sensing analysis detected more than a thousand Chinese-flagged fishing vessels converging into tight, linear formations in the East China Sea. The pattern first appeared over Christmas, with roughly 1,700 boats arranging themselves into adjacent L-shaped lines off the coast near Ningbo. It recurred in early January, this time holding position for more than 30 hours and stretching across roughly 200 miles of open water. A third, even larger muster reportedly approached 2,000 vessels.