Um, no, it'll mean more drastic measures to capture those remaining fish. The higher price will help cover the costs of more expensive means of production. That means drag nets miles wide and 4,000 feet down if that's what it takes. Real world example: the oil business. Are more wells running when oil is $15 a barrel, or $30? The higher the unit sales price, the more units will be offered up (potentially driving the price down) but in the case of fish, they can spoil before being sold.
Just as the enviromentalist whackos are fools to instantly assume the planet is dying, people who believe there can never be an environmental catastrophe aren't exactly thinking clearly themselves. Overfishing is real, folks, and the free market might not come to the rescue in time.
LTS
Wouldn't higher prices only encourage more fishermen to hit the seas hoping for huge revenues, thus making the shortage even worse?
Pay fifty bucks a pound for pigeon, and watch how fast NYC develops a pigeon shortage...