Do you know that for a fact or are you just shoolting off your mouth? I've got data that says it's the latter. Aquaculture killed the salmon fishing industry. You can't buy diesel for the boat and compete with farmed salmon sold at $1.25 per pound. There was a record salmon run this year. After the Peacific Decadal Oscillation completed its cycle the numbers came back up. Now if we could just get NMFS to do something about overpopulated pinnipeds, mismanaging the hatcheries, and stop messing with the smolt run trying to make Gray Davis look good, the salmon would be doing great.
I realize this isn't politically correct on FR, where business is always right and enviros ALWAYS wrong, but commercial fishermen wipe out fisheries, unless the government can close it before they can. It's happened, is happening, and will happen, because of the nature of the industry (people don't own plots of ocean, and as a population declines the price for the fish goes up.)