Paying fishermen subsidies not to fish may be the only method of preserving a fish population and allowing it them to continue producing so that the world does not deplete the fish population, or end the entire industry.

It may make more sense to pay fishermen not to fish than it does to pay farmer not to grow.

Renewable resources affect our food supply as much or more than it does our energy supply.

Or, prohibiting fishing except as leisure activity and entertainment could reduce overfishing that will deplete the fish population at current rates, and allow the oceans to cleanse themselves without human help. Sometimes natural resources are better than man made or man manipulated resources.