You're arguing against... Numbers? By the numbers, China's contribution to the world's wild fishing is proportional to their population (~18% of the world), and most of China's fish supply comes from aquaculture.

The fact that you're focusing on this 18% (mind you, China does control a good chunk of the world's productive fisheries just due to the sheer scale of the rivers in China) rather than the remaining 82%...

Arguing that China is overexploiting global fisheries, frankly, doesn't look at the quantitative data.