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SESK: Stuff Everyone Should Know · sesk.info/fish-healthy-looking-germs

Can a fish that looks perfectly healthy still spread germs like Salmonella to people?

Yes. Healthy-looking fish can still carry germs.

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  1. No, only sick-looking fish carry germs
  2. Only saltwater fish can
  3. Yes, healthy-looking fish can carry germs ✔

Why: CDC lists Salmonella among germs pet fish can spread and says fish that appear healthy may still spread germs. Washington State University notes these infections often do not make fish look sick.

Huh, didn't know that: CDC also lists aeromoniasis, vibriosis and mycobacteriosis among diseases spread by pet fish.

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Why did the fish get a passport? It wanted to see the seven seas.
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References

Answer: Yes, healthy-looking fish can carry germs. CDC lists Salmonella among germs pet fish can spread and says fish that appear healthy may still spread germs. Washington State University notes these infections often do not make fish look sick.

  1. CDC Healthy Pets: Fish www.cdc.gov/healthy-pets/about/fish.html
    Even though fish appear healthy, they may still spread germs to humans.
    Checked 2026-10-11.
  2. Washington State University IACUC: Zoonoses Associated with Fish iacuc.wsu.edu/zoonoses-associated-with-fish
    Often these infections do not make fish appear ill but can cause serious illness in humans.
    Checked 2026-10-11.
  3. CDC Healthy Pets: Fish www.cdc.gov/healthy-pets/about/fish.html
    Below are certain diseases that can be spread by pet fish.
    Checked 2026-10-11.

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