On the Dragon Mastiff Mark One, the middle-aged captain stood on deck inspecting the fishing ship in the not-so-far distance with a cold gaze as it ignored his warning and continued chasing the school of fish.
The sea around China was very large, but to fishing companies like theirs, it still wasn't large enough. For instance, the triangular area between China, Korea, and Japan could be passed through in a bit over a day. If you took away the national waters of Japan and Korea, the fishing locations shrank even further, and many fishing companies competed for the remaining locations.
At any rate, their medium to small sized fishing ships didn't have the ability to go out to the deep seas, and those areas were fought over by the larger companies anyway.
Dragon Mastiff's fleet of five ships, each over thirty meters long, allowed their company to establish some power in the area, and it could be said that they had control of this territory.