If you want to maximize health benefits from fish, you want to steer clear of farmed fish, particularly farmed salmon fed dangerous chemicals. Wild salmon gets its bright pinkish-red color from natural carotenoids in their diet. Farmed salmon, on the other hand, are raised on a wholly unnatural diet of grains (including genetically engineered varieties), plus a concoction of antibiotics and other drugs and chemicals not shown to be safe for humans.
This diet leaves the fish with unappetizing grayish flesh so to compensate, they’re fed synthetic astaxanthin made from petrochemicals, which has not been approved for human consumption and has well known toxicities. According to the featured article, some studies suggest it can potentially damage your eyesight. More details are available in yesterday’s article.