Why does a preserved fish become brown after it's rehydrated?

Question

Why does a preserved fish become brown after it's rehydrated?

Answer

If the skin of the fish is no longer covering it then the likely cause for this is that the oxygen in the air is causing the fish to oxidize. You will likely see that this continues as the fish is left out longer. Fresh lemon juice squeezed onto the fish can help slow this process.

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