Thousands of Chinese fishing boats have repeatedly assembled into vast, coordinated formations in the East China Sea, prompting experts to question whether the maneuvers signal preparations by Beijing's maritime militia for potential conflict.

An investigation published Friday by AFP, drawing on automatic identification system (AIS) data and satellite imagery, detailed three major incidents. On December 25, 2025, approximately 2,000 Chinese-flagged fishing vessels gathered about 300 kilometers northeast of Taiwan. They formed two parallel reverse L-shaped barriers, each stretching around 400 kilometers long, and held positions for roughly 30 hours despite near gale-force winds. Cargo ships detoured around the dense clusters or zigzagged through them, according to ship-tracking records.

A second event unfolded between January 9 and 12, 2026. Around 1,400 vessels converged into a rectangular formation over 200 miles long near major shipping lanes off Shanghai. Hundreds of these boats had participated in the December gathering, indicating repeated involvement by the same fleets. The most recent documented assembly occurred in late February 2026, when about 1,200 boats lined up in two parallel formations spanning 400 kilometers for over 30 hours in rough weather.

Data from firms including ingeniSPACE, Starboard Maritime Intelligence, and Global Fishing Watch confirmed the vessels' positions through AIS signals, nighttime satellite images from Unseenlabs, and corroborative patterns with historical fishing activity. The boats followed China's fishing vessel naming conventions and originated largely from Zhejiang province.

Maritime experts dismissed commercial fishing as an explanation, citing the unprecedented scale, geometric precision, rapid muster, and endurance in adverse conditions. "The level of coordination to get that many vessels into a formation like this is significant," said Mark Douglas of Starboard Maritime Intelligence. Gregory Poling of the Center for Strategic and International Studies described it as likely "an exercise to see how the civilians would do if told to muster at scale in a future contingency, perhaps in support of quarantine, blockade, or other pressure tactics against Taiwan."

Analysts pointed to China's maritime militia program, which trains civilian fishermen to augment the People's Liberation Army Navy and Coast Guard in gray-zone operations. These boats could serve as decoys, swarm sensors, or barriers to impede warships or commercial traffic in a Taiwan crisis or disputes over the Senkaku/Diaoyu Islands. The U.S. Defense Department's 2025 report noted Beijing's progress toward readiness for a Taiwan conflict by 2027.

Neither China nor Japan issued public statements on the formations. Japan's Defense Ministry and Coast Guard declined comment, citing operational security. The gatherings occurred near the Sino-Japanese median line and Japan's exclusive economic zone, adding to longstanding tensions in the resource-rich waters.

Such displays mark an escalation from prior militia activities, where smaller groups harassed rivals in the South China Sea or around disputed features. The precision and size suggest advancing command-and-control capabilities for civilian fleets, potentially enabling Beijing to project power without overt military action.