2012 Fiscal Year Final Research Report
Study on impact and pathobiology of Perkinsus infection in wild Manila clam for recovery of Manila clam resources
| Project/Area Number |
22380106
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Keywords | アサリ / Perkinsus / 病害 / 資源 |
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| Research Abstract |
Experimental challenge of Manila clam with the protozoan Perkinsus olseni revealed that this protozoan was lethal to the host and that the lethal infection intensity to Manila clam was around 106 cells/g soft tissue weight. Three-year monitoring of the infection level of the protozoan and the dynamics of a host population was carried out at one location in Ariake Bay where Manila clam population has dramatically decreased since late 1970s. This monitoring demonstrated that the infection prevalence reached 100 % and the population sizes of Manila clams decreased when the highest infection intensities reached the lethal infection intensity experimentally obtained. The results strongly suggested that infection with the protozoa was the major factor for the depletion of Manila clam resources.
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