Studies on epizootic iridovirus infection among red sea bream, Pagrus major (Temminck & Schlegel), cultured in Taiwan

Studies on epizootic iridovirus infection among red sea bream, Pagrus major (Temminck &... Since 1993, an epizootic viral disease has occurred in net‐cage cultured red sea bream, Pagrus major (Temminck & Schlegel), in Peng‐hu Island located on the south‐western coast of Taiwan. The diseased fish exhibited abnormal swimming and were lethargic, but few visible external signs were observed. The cumulative mortality because of the disease sometimes reached 50–90% over 2 months. Histopathogical studies of the affected fish showed enlarged basophilic cells in the gill, kidney, heart, liver and spleen. These necrotic cells were Feulgen‐positive and stained blue using Giemsa. Transmission electron microscopy revealed icosahedral virions in the cytoplasm of the necrotic cells. The viral particles consisted of a central nucleocapsid (75–80 nm) and envelope, and were 120–150 nm in diameter. These results suggest that the virus belongs to the Iridoviridae. Using polymerase chain reaction (PCR), approximately 570 bp fragments were produced from the viral DNA using as a template 1‐F and 1‐R primers derived from red seabream iridovirus (RSIV) from red sea bream in Japan. Similar results were also obtained using nested‐PCR with different primer sets (1‐F, 2‐R and 2‐F, 1‐R). Although the size and some features of epizootics of this virus differed from RSIV in Japan, it shows close genetic affinities with the latter and it is suggested that RSIV has been introduced to Taiwan. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Diseases Wiley

Studies on epizootic iridovirus infection among red sea bream, Pagrus major (Temminck & Schlegel), cultured in Taiwan

Journal of Fish Diseases, Volume 26 (3) – Mar 1, 2003

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Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7775
eISSN
1365-2761
DOI
10.1046/j.1365-2761.2003.00441.x
Publisher site
See Article on Publisher Site

Abstract

Since 1993, an epizootic viral disease has occurred in net‐cage cultured red sea bream, Pagrus major (Temminck & Schlegel), in Peng‐hu Island located on the south‐western coast of Taiwan. The diseased fish exhibited abnormal swimming and were lethargic, but few visible external signs were observed. The cumulative mortality because of the disease sometimes reached 50–90% over 2 months. Histopathogical studies of the affected fish showed enlarged basophilic cells in the gill, kidney, heart, liver and spleen. These necrotic cells were Feulgen‐positive and stained blue using Giemsa. Transmission electron microscopy revealed icosahedral virions in the cytoplasm of the necrotic cells. The viral particles consisted of a central nucleocapsid (75–80 nm) and envelope, and were 120–150 nm in diameter. These results suggest that the virus belongs to the Iridoviridae. Using polymerase chain reaction (PCR), approximately 570 bp fragments were produced from the viral DNA using as a template 1‐F and 1‐R primers derived from red seabream iridovirus (RSIV) from red sea bream in Japan. Similar results were also obtained using nested‐PCR with different primer sets (1‐F, 2‐R and 2‐F, 1‐R). Although the size and some features of epizootics of this virus differed from RSIV in Japan, it shows close genetic affinities with the latter and it is suggested that RSIV has been introduced to Taiwan.

Journal

Journal of Fish DiseasesWiley

Published: Mar 1, 2003

References

  • Iridovirus‐like infection associated with high mortalities of striped beakperch, Oplegnathus fasciatus (Temminck et Schlegel), in southern coastal areas of the Korean peninsula
    Jung, Jung; Oh, Oh
  • Genetic similarity of iridoviruses from Japan and Thailand
    Miyata, Miyata; Matuno, Matuno; Jung, Jung; Danayadol, Danayadol; Miyazaki, Miyazaki

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