I bought salmon a week ago and wanted to make it for dinner today. When I took it out of the refrigerator, it had a yellow stain on it. What is it? | June 18, 2025

A yellow stain on salmon, especially if it’s been stored for a week in the refrigerator, could be a sign of oxidation or spoilage. Here are a few potential causes for the yellow stain:

1. Oxidation

• Salmon, like many types of fish, contains fatty acids, particularly omega-3 fatty acids, which can oxidize when exposed to air. This process can sometimes result in a yellowish hue on the flesh, especially if the salmon has been stored for a while.
• While oxidation doesn’t necessarily mean the salmon is spoiled, it can affect the flavor and texture of the fish, making it less appetizing.

2. Spoilage or Bacteria Growth

• If the yellow stain appears to be more of a discoloration or looks slimy, this could indicate bacterial growth. Spoiled fish may develop off smells, textures, and colors, including yellowing.
• Bacterial contamination can also cause a change in color, and the fish may have a strong, unpleasant odor. If it smells “off” or sour, it is likely spoiled and should not be consumed.

3. Fatty Tissues in Salmon

• Salmon has a high fat content, particularly in certain parts of the fish (like the belly or skin), and sometimes the fat can separate or become more prominent with age. This can lead to a yellowish tint, especially near these fattier sections. If this is the case, and the fish otherwise looks and smells fine, it might still be safe to eat, although the texture and taste may be altered.

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