Screening of freshwater fish species for their susceptibility to a betanodavirus.

Diseases of Aquatic Organisms Volume 77 Issue 2 Page 119-125 published_at 2007-09-14
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Title ( eng )
Screening of freshwater fish species for their susceptibility to a betanodavirus.
Creator
Furusawa Ryo
Source Title
Diseases of Aquatic Organisms
Volume 77
Issue 2
Start Page 119
End Page 125
Abstract
Betanodaviruses, the causative agents of viral nervous necrosis in marine fish, have bipartite positive-sense RNA genomes. Because the genomes are the smallest and simplest among viruses, betanodaviruses have been well studied using a reversed genetics system as model viruses. However, studies of virus–host interactions have progressed slowly because permissive hosts for betanodaviruses (basically larvae and juveniles of marine fish) are only available for limited periods of the year and are not suitable for the construction of a genetic engineering system. To obtain a model fish species that are not subject to these problems, 21 freshwater fish species were injected intramuscularly with a betanodavirus (redspotted grouper nervous necrosis virus) and tested for their susceptibility to the virus. Based on their responses, the tested fish were classified into 3 groups: 4 susceptible fish, 10 less susceptible fish, and 7 resistant fish. The susceptible fish, celebes rainbowfish Telmatherina ladigesi, threadfin rainbowfish Iriatherina werneri, dwarf rainbowfish Melanotaenia praecox, and medaka Oryzias latipes, exhibited erratic swimming and eventually died within 10 d post-inoculation. The virus was specifically localized in the brains, spinal cords, and retinas of the infected fish, similar to the pattern of infection in naturally infected marine fish. We believe that these susceptible freshwater fish species could act as good host models for betanodavirus–fish interaction studies.
Keywords
Betanodavirus
Freshwater fish
Model fish
Experimental infection
Medaka
Rainbowfish
NDC
Zoology [ 480 ]
Language
eng
Resource Type journal article
Publisher
Inter-Research
Date of Issued 2007-09-14
Rights
Copyright (c) 2007 Inter-Research.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0177-5103
[ISSN] 1616-1580
[DOI] 10.3354/dao01841
[NCID] AA10443976
[DOI] http://dx.doi.org/10.3354/dao01841