Farmed fish (and in many casesAtlantic salmon are farmed) have the potential of escaping and breeding with native fish, which reduces the genetic integrity of the endemic species. Their “pens” also reduce a great deal of chemicals and waste (pollution) into their water systems, and farmed fish harbor disease as well.
Overall, they alter the natural environment a great deal, and more sustainable options should be seeked out when purchasing fish to eat.
Farmed salmon are not as good as wild salmon because farmed salmon contain high levels of PCBs, which are thought to be carcinogens. The high PCB levels are probably a result of the different feed that farmed salmon eat as well as their relatively high fat content.
If you think about, take into consideration the idea of farming a fish. Overcrowded conditions, spread of disease and lack of natural diet are all things that affect farmed salmon that wild salmon have to deal with considerably less. So, the farmed fish don’t have the opportunity to grow as much and also have the aforementioned conditions affecting the quality of their health.
Compared to farm-raised salmon, wild salmon is far more nutritious in terms of fat and protein content, and they contain much more usable omega-3 fatty acids. Also, farm-raised salmon are 8 times higher in Polychlorinated biphenyls (PCB) content, which are a highly toxic class of organic compounds.
The following link further differentiates wild salmon’s virtues:
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