Causative agent: Ligula intestinalis, Bothriocephalus, Spirometra and others — intestinal cestode parasites
Fish tapeworms (cestodes) are internal parasites that live in the intestinal tract of aquarium fish, feeding on nutrients and slowly starving their host. In Australian aquariums, tapeworms are most commonly introduced through live foods such as Tubifex worms, Daphnia, or other aquatic invertebrates that act as intermediate hosts in the tapeworm's life cycle. A heavily infected fish will often continue eating normally while visibly losing weight, as the tapeworms intercept the nutritional value of the food. In advanced cases, worm segments may be visible in the fish's faeces, or the abdomen may appear lumpy or distended. Praziquantel is the treatment of choice worldwide and is available in Australia through Aristopet Fluke & Tapeworm Tablets. Administering medication through medicated food is the most effective delivery method, ensuring the drug reaches the parasites directly in the intestinal tract. Hobbyists who source live foods should always use trusted suppliers to minimise the risk of introducing tapeworms.
Symptoms
- •Weight loss and wasting despite eating
- •distended or lumpy abdomen
- •visible worm segments in faeces
- •loss of appetite
- •lethargy
- •secondary infections
Treatment
- •Praziquantel (most effective)
- •fenbendazole
- •medicated food treatment preferred for best absorption
- •treat for full 2+ week cycle
Australian Medications
- •Aristopet Fluke & Tapeworm Tablet
- •praziquantel powder via aquarium suppliers
Commonly Affected Fish
- •All freshwater fish
- •goldfish, koi, and cichlids commonly affected
- •some marine fish
Important Notes
Most commonly introduced via live foods (Tubifex, Daphnia). Medicated food is more effective than water dosing for internal worms.