
Farmed fish are usually fed an unnatural diet, and are subject to overcrowding, disease, such as sea lice, and are fed antibiotics. Farmed fish also have higher levels of cancer-causing toxins like PCBs and dioxin.
Ask your fish monger to buy wild fish and remember not all wild fish are good for the environment either. There are some regions over fish or use destructive methods to catch fish resulting in habitat destruction.
You can download a pocket guide to help you decide at the Environmental Defence Fund’s website here, http://www.edf.org/documents/1980_pocket_seafood_selector.pdf

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Looking forward to your comments, Barry.