There are three main categories of salmon you'll find when you're shopping for fresh salmon at your local fish market or grocery store. First, the salmon may be fresh wild salmon, caught by fisherman. Secondly, the salmon may be carefully cultivated in salmon farms. This is very common all over the world. But the Pacific Northwest is not one of the places you'll likely find farmed Salmon (farmed salmon is most commonly Atlantic salmon), and wild salmon fishing is very strictly regulated. Thirdly, both wild and farm salmon can be sold frozen, or may have been previously frozen (often while at sea) and then thawed by the market. All three are potentially edible salmon, but you need to know how to buy salmon, and why you might want to avoid farmed salmon.