I think the answer to that question is evident, but at what cost?

Are you ready to put down your rod for the 10-20yrs it would take to have harvestable stocks of wild fish? I'll readily admit my selfishness and that I am not.

Are we going to undergo a worldwide campaign to keep people from eating fish? Not likely (although I do like the reports I see of land-based salmon farms).

Not a very likely solution.