Epizootic haematopoietic necrosis virus: epidemiology and uncertainty

Nguyen T., . and Dixon R., . and Hyatt A., . and Whittington R., . and Li L., . Epizootic haematopoietic necrosis virus: epidemiology and uncertainty. pp. 1235-1255. ISSN 0116-6514

Epizootic haematopoietic necrosis virus (EHNV) was the first virus isolated from fish in Australia and the first iridovirus associated with systemic infection and epizootic mortality. It is one of only five diseases of finfish that are notifiable to the Office International des Epizooties (OIE). The EHNV causes epizootic mortality in wild redfin perch (Perca fluviatilis) and a fatal disease of low prevalence in farmed rainbow trout (Oncorhynchus mykiss) while related viruses (European sheatfish virus SV/European catfish virus ECV) cause epizootic mortality in sheatfish (Silurus glanis) and catfish (Ictalurus melas) in Europe. Being an indiscriminate pathogen EHNV lacks host specificity but displays considerable variation in virulence in different species of finfish. Detection of EHNV in rainbow trout can be difficult because the mortality rate may barely rise above background levels. However EHNV can be detected in affected fish among routine mortalities and may be associated with specific antibodies in a small proportion of older fish. Sampling to detect EHNV for certification purposes should be based on examination of routine mortalities rather than random samples of live fish. Further studies are needed to identify the environmental reservoir of the ranaviruses found in finfish because fish may be accidental hosts. The natural reservoir could be among the amphibians and reptiles because redfin perch sheath fish and catfish seem to be too susceptible and rainbow trout too resistant to account for the ecological persistence of the virus. This research will assist in the critical assessment of the role of legal and illegal trade in food fish ornamental fish reptiles and amphibians in the trans-border spread of these viruses.

Full text available from: Official URL: http://www.asianfisheriessociety.org/publication/d...

Abstract

Epizootic haematopoietic necrosis virus (EHNV) was the first virus isolated from fish in Australia and the first iridovirus associated with systemic infection and epizootic mortality. It is one of only five diseases of finfish that are notifiable to the Office International des Epizooties (OIE). The EHNV causes epizootic mortality in wild redfin perch (Perca fluviatilis) and a fatal disease of low prevalence in farmed rainbow trout (Oncorhynchus mykiss) while related viruses (European sheatfish virus SV/European catfish virus ECV) cause epizootic mortality in sheatfish (Silurus glanis) and catfish (Ictalurus melas) in Europe. Being an indiscriminate pathogen EHNV lacks host specificity but displays considerable variation in virulence in different species of finfish. Detection of EHNV in rainbow trout can be difficult because the mortality rate may barely rise above background levels. However EHNV can be detected in affected fish among routine mortalities and may be associated with specific antibodies in a small proportion of older fish. Sampling to detect EHNV for certification purposes should be based on examination of routine mortalities rather than random samples of live fish. Further studies are needed to identify the environmental reservoir of the ranaviruses found in finfish because fish may be accidental hosts. The natural reservoir could be among the amphibians and reptiles because redfin perch sheath fish and catfish seem to be too susceptible and rainbow trout too resistant to account for the ecological persistence of the virus. This research will assist in the critical assessment of the role of legal and illegal trade in food fish ornamental fish reptiles and amphibians in the trans-border spread of these viruses.

[error in script]

Item Type:	Article
AGROVOC Term:	Epizootics
AGROVOC Term:	Viruses
AGROVOC Term:	Perca fluviatilis
AGROVOC Term:	Oncorhynchus mykiss
AGROVOC Term:	Silurus
AGROVOC Term:	Ictalurus
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Antibodies
AGROVOC Term:	Certification
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7835

Actions (login required)

View Item