Question

Which fish disease is not listed in OIE list ?

• A. Infection with viral haemorrhagic septicaemia virus
• B. Infection with Gyrodactylus salaris
• C. Infection with Aphanomyces invadans
• D. Infection with Ichthyophthirius multifiliis

Hint:

The WOAH (OIE) list includes major transboundary pathogens of concern (like VHS, EUS, and Gyrodactylosis), but excludes highly common, globally ubiquitous parasites like Ich (Ichthyophthirius).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The World Organisation for Animal Health (formerly OIE, now WOAH) maintains a standardized register of transboundary animal diseases of global socioeconomic and ecological significance.
This aquatic disease list dictates international quarantine regulations and import-export health certifications.

Step 2: Detailed Explanation:
Let us examine the status of each of the listed pathogens on the WOAH (OIE) list:
1. Infection with viral haemorrhagic septicaemia virus (A): VHS is a highly contagious, regulated rhabdovirus of finfishes listed as a significant transboundary disease.
2. Infection with Gyrodactylus salaris (B): This ectoparasitic monogenean trematode of salmonids can decimate wild salmon populations, and is strictly listed as a regulated disease.
3. Infection with Aphanomyces invadans (C): This oomycete fungus is the primary causative agent of Epizootic Ulcerative Syndrome (EUS), which is a major, highly destructive listed disease of freshwater and brackishwater finfishes.
4. Infection with Ichthyophthirius multifiliis (D): Commonly known as "Ich" or "white spot disease" of freshwater fishes, this is a highly common ciliated protozoan parasite found in freshwater systems globally. Because of its cosmopolitan distribution and lack of strictly defined transboundary quarantine barriers, it is not included on the official WOAH (OIE) list of reportable diseases.

Step 4: Final Answer:
Therefore, infection with Ichthyophthirius multifiliis is not listed in the OIE list.