This doesn't pass the sniff test. The US has the most capable and dominant naval presence on the planet and they use it. Nothing happens near their territorial waters without their permission and they see it coming long before it happens. The "ghost fleet" fishing incidents -- which are a real concern -- happen to countries with minimal maritime defenses.

You can blame China for many things but this definitely isn't one of them. Episodic fishery collapses are a thing that occurs naturally aside from fishing activity, and the Alaskan fishery is one of the best managed in the world.