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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI:

    Japanese amberjack Seriola quinqueradiata and red sea bream Pagrus major susceptibility to infectious hematopoietic necrosis virus (IHNV) isolate

    Takafumi Ito*, Takashi Kamaishi

    *Corresponding author:

    ABSTRACT: Infectious hematopoietic necrosis virus (IHNV) is known as a causative agent of heavy mortalities in farmed rainbow trout. However, there is limited information on the virulence to marine fish species. In this study, Japanese amberjack Seriola quinqueradiata and red sea bream Pagrus major were experimentally infected by intraperitoneal (IP) injection and immersion route, with an IHNV isolate from rainbow trout in Japan, to evaluate the virulence of the virus for these fish species. The cumulative mortality for immersed rainbow trout was 15%. IHNV was isolated from all dead fish and 50% of the sequentially sampled rainbow trout. Japanese amberjack were challenged by IP injection and immersion, resulting in cumulative mortalities of 70% and 0%, respectively. The virus was isolated from all dead fish and 1 out of 3 Japanese amberjack at 9 d post exposure. However, no mortality was observed in either of the red sea bream groups challenged with IHNV. IHNV was not isolated from any of the surviving red sea bream, or from any of the sequentially sampled fish. The titer of Japanese amberjack derived-YTF cells was in the same log range of FHM and RTH-149 cells, but the titers of the red sea bream cell lines SBK and GBRS were lower than the other cell lines, and were significantly different from the FHM and RTH-149 cell lines. These results suggest that Japanese amberjack has a low susceptibility to IHNV, and red sea bream has no or little susceptibility to the virus.