In the US they are farmed in closed recirculating systems and they require less fishmeal than other carnivores, meaning farmers get a lot of fish for how much feed they put in. They have a sweet, mild taste and delicate texture, comparable to Chilean seabass.
http://www.oneworldoneocean.com/blog/entry/the_green_list_us_farmed_fish
However, PCBs persist in the environment. Fish absorb PCBs from contaminated sediments and from their food. Wild Salmon vs Farm Raised Salmon David Suzuki Foundation: In January 2001, BBC News produced a program Warnings from the Wild, The Price of Salmon. The program cited a pilot study conducted by Dr Easton with David Suzuki Foundation.
http://www.healthcastle.com/wildsalmon-farmraisedsalmon.shtml
1 Farm Raised salmon are fatter: farm raised salmon are generally bigger in size and contain more fat than wild salmon. 2  PCBs are stored in fat and remain there for an extended period of time, therefore farm raised salmon contain more PCBs.
http://www.healthcastle.com/wildsalmon-farmraisedsalmon.shtml
Tuna and salmon, for example, need to eat up to five pounds of fish for each pound of body weight. The result is that prey (fish like anchovies and herring) are being fished to the brink of extinction to feed the world’s fish farms.
http://www.mindbodygreen.com/0-11561/9-things-everyone-should-know-about-farmed-fish.html
The study found that farm raised salmon and the feed they were fed appeared to have a much higher level of contamination with respect to PCBs, organo-chlorine pesticides and polybrominated diphenyl ethers than did wild salmon. It concluded that it seems that contamination in farm fish comes from the feed.
http://www.healthcastle.com/wildsalmon-farmraisedsalmon.shtml
Meghan MacGillivray | October 03 2012. While experts agree certain types of fish should be avoided due to overfishing or habitat damage, there are many delicious and eco-friendly alternatives. Here are a few of our favorites from the Green List. Check out our Know Your Seafood infographic for more options. US Farmed tilapia, catfish, barramundi, striped bass and rainbow trout. There are several fish species that thrive in a farm setting, and despite fish farming occasionally having a bad name, it can be done in a sustainable way.
http://www.oneworldoneocean.com/blog/entry/the_green_list_us_farmed_fish
Here’s one solution to the farmed fish dilemma: vote with your pocketbook and eat less seafood or give it up completely. Get your omega-3’s from flax, hemp, soy, or walnuts – all without cholesterol or mercury.
http://www.mindbodygreen.com/0-11561/9-things-everyone-should-know-about-farmed-fish.html
4. Farmed fish are loaded with disease, and this spreads to wild fish populations. Farmed fish are packed as tightly as coins in a purse, with twenty-seven adult trout, for example, typically scrunched into a bathtub-sized space.
http://www.mindbodygreen.com/0-11561/9-things-everyone-should-know-about-farmed-fish.html
On the other hand, recent media reported that some fish and farm raised salmon contain toxic substances. We will discuss a few major reports and some background information about farm raised salmon and PCBs so that you can make a sound decision.
http://www.healthcastle.com/wildsalmon-farmraisedsalmon.shtml
This article looks at aquaculture and its long-term effects on fish, people, and other animals. With this industry regularly touted as a paragon of food production, whether you eat seafood or not, you should know these nine key facts about farmed fish. 1. Farmed fish have dubious nutritional value.
http://www.mindbodygreen.com/0-11561/9-things-everyone-should-know-about-farmed-fish.html
which fish are farm raised
Salmon is the farm raised fish. Salmon fish is farm raised. Salmon fish are farm raised.