Epizootiological study on mass mortalities of the cultured scallops <i>Argopecten irradians</i>

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

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ZHANG Wei-zhu, WU Xin-zhong, LI Deng-feng, SUN Jing-feng, ZHANG Yang, YANG Xia. Epizootiological study on mass mortalities of the cultured scallops Argopecten irradians[J]. Haiyang Xuebao, 2005, 27(5): 137-144.

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ZHANG Wei-zhu, WU Xin-zhong, LI Deng-feng, SUN Jing-feng, ZHANG Yang, YANG Xia. Epizootiological study on mass mortalities of the cultured scallops Argopecten irradians[J]. Haiyang Xuebao, 2005, 27(5): 137-144.

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Epizootiological study on mass mortalities of the cultured scallops Argopecten irradians

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

Received Date: 2004-10-23
Rev Recd Date: 2005-05-13

Abstract

Abstract

A systemic epizo otiological study on mass mortalities of the cultured sea scallop Argopectenirra dians was carried out during the period of 2001~2002.The results show that the mortality rate of the juvenile population of A.irradians is about 60% from June to October,with the death peak occurring in June.The results on investig ation of environm ntal factors revealed that the lower water temperature might be the serious stress factor to the cultured juvenile populations of A.irr adians.Several suspicious pathogens infecting the scallop were found such as rickett sia-like or ganism(RLO),my coplasma-like organism(M L O).The results of histological observation showed that rickettsia-like org anism inclusions were common,histological widespread infective agent.The averaged prevalence was from 15%~80% among cultured juvenile populations with averaged sizes of 0.5~5 cm.The highest infection intensity of RLO was from averaged 11.5 to 16 inclusions persection during the death peak of juvenile populations.An inference is made from the above analysis that RLO infection is positively correlated with mor tality rates of juvenile populations and may be the main pathogen responsible for mass mortalit ies of the cultured juvenile populations of scallop,A.irradians on the basis of the obser vation of intensity of RLO infection and hostpathology.
- Argopecten irradians,
- epizootiology,
- rickettsia-like organism,
- mycoplasma-like organism,

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References(21)

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