Oxidized Fat
Salmon is naturally rich in healthy fats—part of what gives it that melt-in-your-mouth texture. But those fats can oxidize over time, especially if the fish has been frozen for an extended period or wasn’t stored airtight. Oxidation causes the fat to change color, often turning yellow or even slightly brown. Think of it like an apple slice left out too long—it browns, but it’s not necessarily spoiled. Similarly, oxidized fat may affect appearance and flavor slightly, but it doesn’t mean the salmon is unsafe—as long as there are no other signs of spoilage, such as a sour odor, slimy texture, or off taste.
Freezer Burn
Another common cause? Freezer burn. If salmon isn’t tightly sealed before freezing, moisture can escape, leading to dry, discolored patches—sometimes yellow, sometimes whitish. While freezer-burned areas might be a bit tough or bland, they’re not dangerous. Simply trim them away, and the rest of the fillet is usually perfectly fine to cook and enjoy.
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