Of course, the incentive to over-fish and sell the fish outside the set of monitored ports (in the case of Norway, this means outside Norway) remains the same, so that the equilibrium may well involve more over-fishing. Even if it does result in higher over-fishing, the advantage of a better recording of catches is not insignificant. Conservation efforts depend on accurate statistics and biological models that properly reflect stock dynamics (even with accurate statistics on catches, estimation of the underlying stock is still difficult).