Epizootiological study on mass mortality of the cultured scallop <i>Chlamys farreri</i>

ZHANG Wei-zhu; WU Xin-zhong; SUN Jing-feng; LI Deng-feng

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ZHANG Wei-zhu, WU Xin-zhong, SUN Jing-feng, LI Deng-feng. Epizootiological study on mass mortality of the cultured scallop Chlamys farreri[J]. Haiyang Xuebao, 2006, 28(5): 90-100.

Citation:

ZHANG Wei-zhu, WU Xin-zhong, SUN Jing-feng, LI Deng-feng. Epizootiological study on mass mortality of the cultured scallop Chlamys farreri[J]. Haiyang Xuebao, 2006, 28(5): 90-100.

ZHANG Wei-zhu, WU Xin-zhong, SUN Jing-feng, LI Deng-feng. Epizootiological study on mass mortality of the cultured scallop Chlamys farreri[J]. Haiyang Xuebao, 2006, 28(5): 90-100.

Citation:

ZHANG Wei-zhu, WU Xin-zhong, SUN Jing-feng, LI Deng-feng. Epizootiological study on mass mortality of the cultured scallop Chlamys farreri[J]. Haiyang Xuebao, 2006, 28(5): 90-100.

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Epizootiological study on mass mortality of the cultured scallop Chlamys farreri

1.
Biology Department of Chuzhou University, Chuzhou 239000, China;College of Animal Sciences, Zhejiang University, Hangzhou 310029, China
2.
College of Animal Sciences, Zhejiang University, Hangzhou 310029, China;South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
3.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2005-04-25
Rev Recd Date: 2005-11-23

Abstract

Abstract

A systemic epizootiological study on mass mortalities of the cultured scallop Chlamys farreri was carried out during the period of 2001~2003.The results showed that the accumulated mortality rate of the cultivated scallop Chlamys farreri was very high, more than 90% from April to October, and the dead peak occurred on 24 August,being about 71%.The results on investigation of environmental factors revealed that the higher water temperature, more than 23℃,might be a serious stress factor to the cultured Chlamys farreri.Several suspect pathogens infecting the scallop were found such as rickett sia-like organism (RLO),mycoplasma-like organism (MLO) and virus-like particle (VLP).The results of histological observation showed that rickett sia-like organism inclusions were common, histological widespread infectiveagent.The averaged prevalence was from 20% to 90% among cultured scallop populations with averaged sizes of 2.5~6.1 cm.The highest infection intensity of RLO in host tissues was aver aged 31 inclusions persection.The result of experiment sinfected by purified RLOs showed that RLO was a serious pathogen to the scallop.It is inference that RLO infection was positively correlated with mortality rates of the cultured populations and might be the main pathogen responsible formass mortalities of the cultured population of scallop on the basis of the observation of intensity of natural infection, histological pathology and artificial infection experiment.
- Chlamys farreri,
- epizootiology,
- rickettsia-like organism,
- mycoplasma-like organism,
- virus-like particle,
- infection experiment

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