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
Oil drilling is always stopped when the price to find and produce it drops below the its foreseeable sale price. The Texas economy collapsed for that reason just after I finished high school there in 1980. Market forces are inescapable.
I don’t understand exactly the effect of mile wide mile deep dragnets, but I do know that massive drift nets are illegal due to their destruction in the best of times. When a cod costs 10 times the price of a farm-raised catfish, talapia, salmon and trout, virtually no one will eat cod. And unless the fishermen can recoup the cost of deploying monster nets for minimal catches, they won't do it for long.
No one denies that overfishing is real. Few think that some degree of regulation is bad, but it appears that the market will find a balance that allows most species to exist in significant numbers. I'm not advocating that approach. I don’t know enough about it, but I don’t' dismiss it in general.