As a recreational fisherman, I see the importance of healthy, wild fish stocks--I often take the side against commercial fisherman for several reasons. Commercial fisherman seek to pack their own pockets, with little concern about having a sustainable inudstry in the future. In North Carolina, it is common to find dead or fungus-ridden drum (one of my favorite sportfish) as a result of gill nets. In the ocean, pelagic fish, such as Blue Fin Tuna and Broadbill Swordfish, are nearly extinct due to commercial fishing. Commercial fishing is the only food industry that takes food from wild stocks--all other food industries produce food through agriculture (think cattle, bison, and now even deer). And due to this, there are many externalities to commercial fishing that they commercial fisherman never pay for. To solve this problem, aquaculture came along.
Aquaculture sounds great to the recreational angler, fish that don't come from their fishing stocks but rather a stocked pond. There have been many issues though with aquaculture, I haven't heard anything about this environmental degredation until I read this article. It seems as if aquaculture is fine on a small scale, but as farms increase the pollution becomes unmanagable. Another main issue raised with aquaculture is the fact that to produce 1 lb of fish, on average it takes 3 lbs of ground fish as feed. These three pounds of ground fish often come from commercial fisherman, making aquaculture an even worse problem than standard commercial fishing. Some farms practice sustainable methods of harvesting, for instance farm rasing anchoves to then feed the farm raised salmon--however, this method is expensive.
Looking at these facts, along with the fact that seafood consumption has greatly raised in the past few years (can't find the numbers for this right now, but I think it has doubled in the past 10 years) provides very few options for the future. Hopefully a miraculous new method can be found to raise fish that doesn't hurt fish stocks or pollute the environment.
I understand that the commercial fisherman is as hard of worker as you can find, but the besiege upon them is warranted--especially from the standpoint of the recreational fisherman.