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Diseases of Aquatic Organisms

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DAO 156:39-45 (2023)  -  DOI:

First report of Perkinsus olseni infections in blood cockles Tegillarca granosa on the south coast of Korea

Young-Ghan Cho1,3, Jeong-Hwa Kim1, Hee Jung Choi2, Gwang-Il Jang2, Yun-Kyeong Oh2, Soon-Jeong Lee2, Sung-Youl Hong2, Mun-Gyeong Kwon2, Kwang-Sik Choi1,*

1Department of Marine Life Science (BK21 FOUR) and Marine Science Institute, Jeju National University, 102 Jejudaehakno, Jeju 63243, Republic of Korea
2Aquatic Disease Control Division, National Fishery Products Quality Management Service, Busan 46083, Republic of Korea
3Present address: Tidal Flat Research Center, National Institute of Fisheries and Science, Gunsan 54001, Republic of Korea
*Corresponding author:

ABSTRACT: The protozoan parasite Perkinsus olseni has become a focus of attention since it has been responsible for mass mortalities and economic losses in a wide range of bivalve hosts globally. The P. olseni host range along the south coast of Korea may extend beyond what was previously understood, and blood cockles in the Family Arcidae are also suggested to be potential hosts of P. olseni. In the present study, we applied histology and molecular techniques to identify Perkinsus sp. infections in the blood cockles Tegillarca granosa, which have been commercially exploited on the south coast of Korea for several decades. Histology and molecular techniques, including genus-specific immunofluorescence assay, species-specific fluorescence in situ hybridization, and phylogeny based on the ribosomal DNA internal transcribed spacer region revealed that T. granosa is infected by P. olseni, although the prevalence was low (0.5%). Histology revealed massive hemocyte infiltrations in the mantle, gill, and digestive gland connective tissues, indicating that the infection exerts negative impacts on the host cockles.

KEY WORDS: Perkinsus olseni · Blood cockle · Tegillarca granosa · Histopathology · ITS rDNA

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Cite this article as: Cho YG, Kim JH, Choi HJ, Jang GI and others (2023) First report of Perkinsus olseni infections in blood cockles Tegillarca granosa on the south coast of Korea. Dis Aquat Org 156:39-45.

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