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| The effect of raising water temperature to 33°C in Penaeus vannamei juveniles at different stages of infection with white spot syndrome virus (WSSV) Rahman, M.M.; Corteel, M.; Wille, M.; Alday-Sanz, V.; Pensaert, M.B.; Sorgeloos, P.; Nauwynck, H.J. (2007). The effect of raising water temperature to 33°C in Penaeus vannamei juveniles at different stages of infection with white spot syndrome virus (WSSV). Aquaculture 272(1-4): 240-245. dx.doi.org/10.1016/j.aquaculture.2007.07.228
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622
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Properties > Water properties > Temperature > Water temperature Penaeus vannamei Boone, 1931 [WoRMS] Marien/Kust |
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Shrimp inoculated with HD or LD of WSSV Thai-1 and kept continuously at 27°C till euthanasia were 100% viral antigen positive from 12 (HD) or 24 hpi (LD). Shrimp inoculated with WSSV Viet were 100% positive from 24 (HD) and 48 hpi (LD). Shrimp kept at 27°C, showed clinical signs from 24 (HD) or 24–36 hpi (LD) with both strains. Cumulative mortalities reached 100% with WSSV Thai-1 at 60 (HD) or 84–144 hpi (LD) and with WSSV Viet 100% at 216 hpi (HD) or 90% at 240 hpi (LD). Switch of temperature to 33°C from 0, 12 or 24 hpi was effective in reducing mortality of shrimp inoculated with the LD of both strains and with the HD of WSSV Viet. The switch to 33°C from 24 hpi with the Thai strain (HD) and from 48 and 96 hpi with the Viet strain (LD or HD) had no effect or even accelerated the mortality rate (80–100%). All shrimp were viral antigen positive at death and euthanasia (one shrimp LD WSSV Viet) when kept continuously at 27°C. All dead and euthanized shrimp kept at 33°C from 0 or 12 hpi were viral antigen negative. With 33°C from 24, 48 or 96 hpi, all dead shrimp were viral antigen positive and euthanized shrimp were negative. This study showed that 33°C is effective to prevent disease, reduce mortality and block WSSV replication, but only in the early stages of infection. |
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