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Some food for thought.

http://sfgate.com/cgi-bin/article.cg...NG6C46KRV1.DTL


Farmed salmon, raised in pens worldwide and a staple of the American diet, contain 10 times the level of dangerous chemicals found in wild Pacific salmon, a study concluded Thursday.

Levels of the contaminants studied -- PCBs, dioxins and two banned pesticides -- differed significantly between the farmed and wild salmon primarily because of their diets, according to the new findings, which appear in the latest issue of the journal Science.

...

Wild salmon eat plants, krill, shrimp, anchovies and smaller fish, and migrate thousands of miles in the ocean, away from polluted city and farm runoff [like stripers]. Farmed salmon are fed a concentrated feed high in fish oils and fish meal made from smaller fish that may contain pollutants.

...

"Even the cleanest of the farmed salmon shouldn't be eaten more than once or twice a month'' based on fish safety guidelines developed by the U.S. Environmental Protection Agency for PCBs, said lead author Dr. David Carpenter, a physician and expert on environmental contaminants and human health.

"We're certainly not telling people not to eat salmon. We're trying to tell people what fish are healthy to eat. Wild salmon -- both fresh, frozen and canned -- is very safe,'' he said.