I'd assumed even (say) Chinese fishing fleets were capitalist enterprises. Are they government-owned, or are private-party to private-party transfers of fishing-related capital highly restricted?
Who could possibly even know for sure. But I think my point stands, as Vietnam has the 2nd or 3rd largest fishing fleet in the world right now, and for a few decades the Soviet Union was the 3rd largest. Pursuit of profit isn't the only reason for the tragedy of the fisheries held in common.