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Fish families implicated in histamine poisoning are characterised by a high content of

  • A.free histidine
  • B.trimethylamine oxide
  • C.fat
  • D.calcium

Answer: A

Correct answer: free histidine

Scombroid poisoning is confined to fish with a naturally high free histidine content - tuna, mackerel, bonito, sardine, mahi-mahi and their relatives. Without the substrate the bacteria cannot make the toxin, which is why cod and other white fish are not implicated however badly they are handled.

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