If the yellow stain looks slimy or is accompanied by a foul odor, spoilage is likely. Bacteria thrive in moist, protein-rich environments like fish.
Signs: Sour smell, slimy texture, discoloration beyond yellow (gray or brown).
Impact: Spoiled salmon can cause foodborne illness and should never be consumed.
3. Fatty Tissue Separation
Salmon’s belly and skin contain concentrated fat deposits. Over time, these areas may develop a yellow tint as fat separates or oxidizes.
Impact: If the fish otherwise smells fresh and feels firm, it may still be safe, though flavor and texture could be compromised.
