碩士 / 國立臺灣大學 / 動物學研究研究所 / 94 / There are 20 Penaeid shrimp viruses described at present. Some of them caused huge mortalities of cultured shrimp locally such as MBV in mid 1980’s, YHV and WSSV in early 1990’s and TSV in late1990’s. Shrimp viral diseases in Taiwan catch our attention since the prevalence changed during the two sampling time. Based on the Manual of Diagnostic Tests for Aquatic Animals (OIE, 2003), we screened 40 frozen samples collected during 1994-1995, one batch of formalin-fixed and paraffin-embedded (FFPE) samples gathered in 1995 and 117 live samples from 2004-2005. 86% of shrimp had MBV in 1994-1995 and remarkably reducing to 42% in 2004-2005. Between the collection period, the variation is not remarkable either in the prevalence of shrimp that had WSSV, YHV and TSV or in infecting intensity of these three viruses except MBV. Multiple infections were common wherein more than 83% of samples carried at least 2 viruses simultaneously in 1994-1995 and 50% in 2004-2005. 36% of shrimp had multiple infections caused by MBV, YHV and WSSV, and 38% had MBV and YHV in 1994-1995. 24% of the shrimp samples had simultaneous infection caused by WSSV and YHV in 2004-2005. Conclusively, this is the first time that simultaneous and multiple infection caused by four shrimp viruses(MBV, WSSV, YHV and TSV) was investigated in hatchery-reared tiger shrimp in Taiwan. The investigation is also the first to use FFPE shrimps to detect the viruses. The third genotype of YHV should be the most serious virus in tiger shrimp cultured in Taiwan. This is also the first report that Taiwan hatchery-reared tiger shrimp carried MBV, WSSV and YHV simultaneously. Acoording to our investigation, YHV should have been existing in Taiwan since 1994 and TSV in 1995 which is earlier than previous reports.
| Identifer | oai:union.ndltd.org:TW/094NTU05312025 |
| Date | January 2006 |
| Creators | Mu-Hua Li, 李牧樺 |
| Contributors | 宋延齡 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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