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Clostridium botulinum in fish.

H H Huss, A Pedersen

    Nordisk Veterinaermedicin
    |May 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Clostridium botulinum type E spores are prevalent in Scandinavian and Baltic Sea fish, particularly demersal species. This bacterium was virtually absent in North Atlantic fish, suggesting marine sediment as a potential origin.

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    Area of Science:

    • Food Safety and Microbiology
    • Marine Biology and Ecology
    • Environmental Health

    Background:

    • Clostridium botulinum is a bacterium that can cause serious illness.
    • Understanding its presence in marine environments is crucial for public health.
    • Previous studies have not comprehensively assessed its incidence in various fish populations.

    Purpose of the Study:

    • To determine the prevalence of Clostridium botulinum in fish from Scandinavian waters, the North Sea, and the North Atlantic.
    • To identify specific fish types and geographical locations with higher incidences.
    • To investigate potential sources and transmission routes of Clostridium botulinum type E.

    Main Methods:

    • Analysis of gut samples from 1407 fish caught in specified marine regions.

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  • Microbiological examination for the presence of Clostridium botulinum.
  • Differentiation of contamination sites (gut, surface, gills) and fish types (demersal, pelagic).

    • Main Results:

    • Clostridium botulinum incidence was highest in fish from Scandinavian coastal waters and the Baltic Sea (4-43%), decreasing towards the North Sea (0-8%) and North Atlantic (negligible).
    • Demersal fish (cod, flatfish) showed higher gut contamination rates than pelagic fish (herring).
    • Only type E was detected; contamination was absent in freshwater fish, and pelagic fish contamination was mainly external.

    Conclusions:

    • Clostridium botulinum type E spores appear to originate from marine sediments in coastal and Baltic waters.
    • Fish, particularly demersal species, act as significant carriers, spreading spores through the marine environment.
    • The findings highlight geographical and ecological factors influencing the distribution of this pathogen in edible fish.