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Diseases of Aquatic Organisms

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DAO 133:247-252 (2019)  -  DOI: https://doi.org/10.3354/dao03352

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First report of black-heart disease in Kumamoto oyster Crassostrea sikamea spat caused by Polydora lingshuiensis in China

Ling-Tong Ye1, Lin Wu1,2, Jiang-Yong Wang1,*, Qiong-Zhen Li3, Jun-Liang Guan3, Bang Luo3

1Key Laboratory of Aquatic Product Processing; Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs; South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, PR China
2Shanghai Ocean University, Shanghai, 201306, PR China
3Guangxi Academy of Fishery Sciences, Guangxi Nanning, 530021, PR China
*Corresponding author:

ABSTRACT: A black-heart disease caused by polydorid infestation is reported for the first time in Kumamoto oyster Crassostrea sikamea Amemiya, 1928 spat in a pond at Beihai city, Guangxi province, China, with a prevalence of 100% and a cumulative mortality rate of 50% within 2 mo. In heavily infected oyster spat, blisters extended toward the center of the inner shell surface, around the adductor muscle scar area to form a large black area occupying approximately 50% of the area of the inner shell surface. Morphological analysis identified the pathogen as Polydora lingshuiensis Ye et al., 2015, which was reconfirmed by comparison of its corresponding 18S rRNA and mitochondrial CO1 gene sequences with those in the GenBank database. The mean abundance of mud blisters was significantly higher in live spat than in dead spat, suggesting that P. lingshuiensis preferentially infests live oyster spat. Additionally, P. lingshuiensis larvae were detected in the inlet near the dam, which suggests that the source of P. lingshuiensis larvae infecting the spat may be larvae entering the ponds through the water current from the sea.


KEY WORDS: Black-heart disease · Crassostrea sikamea · Oyster spat · Polydorid


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Cite this article as: Ye LT, Wu L, Wang JY, Li QZ, Guan JL, Luo B (2019) First report of black-heart disease in Kumamoto oyster Crassostrea sikamea spat caused by Polydora lingshuiensis in China. Dis Aquat Org 133:247-252. https://doi.org/10.3354/dao03352

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