They are not going to stop until the last fish is dead

[factsarenotfair]

5. China seizing control of Pacific tuna (article from New Zealand)

China has sent an armada of sophisticated and highly subsidised fishing boats into the South Pacific, including waters north of New Zealand, in a bid to kill off domestic fleets and seize control of the longline tuna fishery, a key fishing industry conference has heard.
...High seas tuna access is controlled by the multinational Western and Central Pacific Fisheries Commission and Dunham says they will ultimately determine quotas by catch histories.

If the Chinese can show they have had more boats fishing for tuna, they will be entitled to the greatest number of quotas.
...
http://www.stuff.co.nz/business/industries/7955188/China-seizing-control-of-Pacific-tuna

I don't think this will stop at the South Pacific.