Norway – Monitoring program 2021: Listeria in salmon slaughterhouses and on salmonids

Mattilsynet

The Norwegian Food Safety Authority has taken listeria samples from 60 slaughterhouses that the Institute of Marine Research has analyzed. The results show that Listeria is present in both the production environment and on fish in some salmon slaughterhouses.

Surveillance program is a measure that the Norwegian Food Safety Authority initiated to gain more knowledge about the segment following a salmonella outbreak in 2019 where 58 became ill after eating exotic dried fruit mixture.

What did we investigate? Listeria in the production environment in the salmon slaughterhouse and from fish that came in and went out of the slaughterhouse.

358 samples from 60 different salmon slaughterhouses (49 establishments and 11 boats):

  • 108 from the production environment
  • 47 from the surface to fish entering
  • 59 from the surface to fish at the last stage of production
  • 144 from raw material at the last stage of production
Period: September 1, 2020 – September 1, 2021
What were we looking for? Listeria monocytogenes
What did we find? Listeria monocytogenes was detected in 22 samples from nine of 49 salmon slaughterhouses (18%), of which 5 had several positive samples.

The 22 positive tests included:

  • 9 samples from the production environment
  • 4 samples of the surface of fish on their way into the slaughterhouse
  • 5 samples of the surface of fish
  • 4 product samples at the last stage of production.

Detection in end product at 6 of 49 (12%) salmon slaughterhouses. The product samples had low concentrations of L. monocytogenes (<10 CFU / g)

None of the slaughter boats had samples with findings of L. monocytogenes .

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