[topkai22]

Embedding surveillance and comms capabilities in fishing fleets is an old trick- there is even a reference in Wikipedia for the Soviets doing it in the 80s (https://en.wikipedia.org/wiki/Spy_ship).

That's not to dismiss it- the PLAN is almost certainly using the fishing fleet to expand its capabilities, and the giant size of the "invisible fleet" has national security implications for the region. The article touches on the use of the fishing fleet to assert Chinese claims to the Spratley islands and other contested regions, which is definitely a concern for regional stability.