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Botulism in fish: a review.

Francisco A Uzal1, Eileen Henderson1, Javier Asin1

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Fish botulism, primarily caused by Clostridium botulinum type E, affects freshwater fish, causing neurological signs. Affected fish can lead to secondary botulism outbreaks in birds.

Keywords:
Clostridium botulinum type Ebotulismfishflaccid paralysis

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Area of Science:

  • Veterinary Medicine
  • Aquatic Animal Health
  • Food Safety

Background:

  • Published information on fish botulism is limited.
  • Freshwater fish are known to be susceptible to botulism.
  • Saltwater fish botulism is largely anecdotal.

Purpose of the Study:

  • To review the current literature on fish botulism.
  • To summarize the clinical signs, etiology, and diagnosis of fish botulism.
  • To discuss the potential sources and implications of fish botulism.

Main Methods:

  • Literature review of published studies on fish botulism.
  • Analysis of reported cases, clinical signs, and etiological agents.
  • Discussion of diagnostic approaches and disease transmission.

Main Results:

  • Clostridium botulinum type E is the primary cause of reported fish botulism.
  • Clinical signs include loss of equilibrium, abnormal swimming, and dark pigmentation.
  • Fish botulism can cause secondary outbreaks in fish-eating birds.

Conclusions:

  • Diagnosis relies on clinical signs and confirmation via botulinum neurotoxin (BoNT) detection.
  • The exact source of BoNT in fish remains unconfirmed.
  • Understanding fish botulism is crucial for aquatic health and food safety.