Public Aquarium Accidentally Kills 100 Reef Fish With Botched Fluke Treatment

Posted by on October 3, 2014 - zero

By Leonard Ho

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Dylox is the organophosphate, trichlorfon. Trichlorfon is one of the active ingredients in many over-the-counter fluke/worm medications. While it has been shown effective against monogenetic trematodes (flukes), some monogeneans have developed resistance to this organophosphate. Dylox is also a neurotoxin that can cause serious harm to animals including humans. Fish exposed to high levels of Dylox (or old batches of Dylox) can exhibit nervous system and respiratory problems leading to death. Even low dosages of Dylox can visibly stress fish. For these reasons, it has fallen out of favor as a first-option fluke treatment.

On the other hand, praziquantel is extremely gentle on fish and rarely causes significant distress or death. Overdosing with praziquantel almost requires willful intent because very large dosages are required to harm fish. It’s also proven to be a highly effective anti-trematode treatment for both freshwater and saltwater fish, although BioPark Aquarium staff reported praziquantel failed to cure their fish of flukes.

Learning from Tragedy

This unfortunate event reminds aquarists that when improperly administered, the cure can sometimes be worse than the disease.

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