Health experts tell us to eat fish for its omega-3 fatty acids, which are heart-healthy and help decrease the risk of cardiovascular disease. Salmon in particular is known for being high in omega-3s. However, if you want to be ecologically conscious, you should check into how your salmon arrived at your grocery store before you purchase it.
When salmon is dubbed "sustainable," that means that catching it won't put a dent in the salmon population and that the biodiversity of the fish habitat isn't negatively impacted. Environmentalists agree that wild Alaskan salmon is your best choice ecologically, since this type salmon isn't overfished and catching it won't negatively impact the salmon population or the biodiversity of the ocean.
On the other hand, farmed Atlantic salmon causes many problems for environment and fish populations, and here's why: In fish farms, thousands of fish are crammed into small areas, resulting in an accumulation of feces and the easy spread of disease. Because many of these fish farms are ocean based, the waste spills out into the surrounding waters and disease can be spread to the wild fish population. If the farmed fish are fed any sort of chemicals or hormones, those also leak into the surrounding waters via fish excrement. In some cases, the pollution is so bad that researchers have actually noted the rotting of the ocean floor [source: GoVeg.com].