Headline: Coordinated Fleet Formations of Chinese Fishing Vessels Observed in East China Sea
Subhead: Satellite data reveals thousands of vessels in strategic formations near Shanghai shipping lanes, sparking debate over military intent.
Key Observation
In late December 2024 and early January 2025, large groups of Chinese fishing vessels formed coordinated formations in the East China Sea. Ship-tracking data and satellite imagery analyzed by multiple sources indicate that these operations involved thousands of vessels.
Operations and Vessel Movements
According to ship-tracking data, approximately 2,000 Chinese fishing vessels assembled into two parallel formations, each extending roughly 290 miles, on December 25, 2024. A second operation around January 11, 2025, involved approximately 1,400 vessels forming a rectangular barrier spanning over 200 miles. Both gatherings occurred near major shipping lanes branching from Shanghai.
Data from Starboard Maritime Intelligence, analyzed by The New York Times and independently confirmed by Jason Wang of ingeniSPACE, showed that some cargo ships in the area either circumnavigated or navigated through the dense vessel formations.
Analysis of Vessel Purpose and Composition
Analysts from the Center for Strategic and International Studies (CSIS) and other research institutions stated that the vessels were "almost certainly not fishing" and were likely "state-directed." Gregory Poling, director of the Asia Maritime Transparency Initiative at CSIS, suggested the operations could be an exercise to test civilian mobilization or a "muster" exercise.
Andrew S. Erickson, a professor at the U.S. Naval War College, stated the formations could be interpreted as a signal of "opposition to Japan" or practice for potential confrontations.
In a separate analysis of Chinese vessels in the South China Sea, Poling described the fleet as a "maritime militia," a state-funded fleet acting as a "third maritime force" alongside the People's Liberation Army (PLA) Navy and China Coast Guard. According to CSIS, the daily average of such vessels in the South China Sea increased from 100 in 2021 to over 241 in 2025. Analysts stated that 70–85% of these vessels are operated by civilians under China's Military-Civil Fusion policy.
Competing Explanations
Different sources offered various explanations for the formations. Chung Ting Huang from Taiwan's Institute for National Defense and Security Research stated the gatherings could be rehearsals for a blockade or part of "cognitive warfare." Poling offered alternative explanations, including "muster" exercises during the Lunar New Year period or vessels waiting out bad weather. Chinese state media quoted fisherman Chen Yanping who said such gatherings occur due to different fishing seasons.
President Xi Jinping praised the maritime militia in 2013, calling one force a "model unit" after a confrontation with the Philippine Coast Guard.