DAO 83:169-179 (2009)  -  DOI: https://doi.org/10.3354/dao02021

Susceptibility of pike Esox lucius to a panel of Ranavirus isolates

Britt Bang Jensen1,2,*, Annette Kjær Ersbøll1, Ellen Ariel2,3

1Department of Large Animal Sciences, Faculty of Life Sciences, University of Copenhagen, Grønnegårdsvej 8,
1870 Frederiksberg C, Denmark
2Department of Fish, Poultry and Fur Animals, National Veterinary Institute, Technical University of Denmark, Hangøvej 8, 8210 Århus N, Denmark
3School of Veterinary and Biomedical Sciences, James Cook University—Douglas Campus, Townsville,
4810 Queensland, Australia

ABSTRACT: In order to study the pathogenicity of ranaviruses to a wild European freshwater fish species, pike Esox lucius fry were challenged with the following Ranavirus isolates: epizootic haematopoietic necrosis virus (EHNV), European sheatfish virus (ESV), European catfish virus (ECV), pike-perch iridovirus (PPIV), New Zealand eel virus (NZeelV) and frog virus 3 (FV3). The fry were infected using bath challenge at 12 and 22°C. Significant mortalities were observed at 12°C for EHNV, ESV, PPIV and NZeelV. Background mortality was too high in the experiments performed at 22°C for any conclusions about viral pathogenicity at this temperature to be drawn. Viruses could be re-isolated from samples from all challenged groups, and their presence in infected tissue was demonstrated using immunohistochemistry. The findings suggest that pike fry are susceptible to EHNV, ESV, PPIV and NZeelV and can be a vector for ECV and FV3. Statistical analysis of the factors associated with positive virus re-isolation showed that the number of fish in the sample influenced the outcome of virus re-isolation. Moreover, the likelihood of positive virus re-isolation significantly differed among the 6 viral isolates. The temperature from where the sample was taken and the number of days after infection were not associated with the probability of a positive virus re-isolation.


KEY WORDS: Ranavirus · Pike · Epizootic haematopoietic necrosis virus · European sheatfish virus · European catfish virus · Pike-perch iridovirus · New Zealand eel virus · Frog virus 3


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Cite this article as: Bang Jensen B, Ersbøll AK, Ariel E (2009) Susceptibility of pike Esox lucius to a panel of Ranavirus isolates. Dis Aquat Org 83:169-179. https://doi.org/10.3354/dao02021

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