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Intestinal Flukes

Trematodes

Intestinal Flukes in Ducks Overview


Intestinal flukes, (Cyathocotyle bushiensis and Sphaeridiotrema globulus) are parasites which infest the duck's lower small intestine and caecae, causing damage. They are transmitted to ducks through eating freshwater snails (Bithynia tentaculata) containing the parasites. Ducks are usually infected late summer or early fall, and may or may not demonstrate clinical signs prior to death. As little as 100 flukes are considered lethal to an adult duck and over 60% of infected snails harbor numbers greater than 100. Usually, ducks will die within 3 to 8 days of ingesting the infested snails.

Symptoms

Lethargy
Weight loss
Decreased egg production
Increased soft-shelled eggs
Worms visible in eggs
Loss of appetite
Blood-stained vents

Diagnosis

  • History - access to snails
  • Clinical signs
  • Fecal exam
  • Necropsy

Treatment

MethodMethod Summary
Praziquantel10-20 mg/kg administered orally, repeat in 10-14 days

Prevention

References

Blogs

Risk Factors

  • Prevent ducks from eating snails

Seasonality

WinterSpringSummerAutumn