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Why can histamine continue to accumulate in chilled fish?

  • A.Cold converts trimethylamine into histamine over time
  • B.Preformed enzyme stays active near refrigeration temperature
  • C.The fish itself begins producing histamine once it is cold
  • D.Chilling raises the free histidine content of the flesh

Answer: B

Correct answer: Preformed enzyme stays active near refrigeration temperature

This is the sting in the tail of histamine control. Even after chilling stops the bacteria growing, the histidine decarboxylase they have already produced continues to work, slowly, at refrigeration temperature. Fish that has been temperature-abused and then chilled therefore keeps accumulating histamine, which is why the abuse cannot be undone.

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