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277 results on '"Kwon, Mun Gyeong"'

6. MONITORING OF OIE-LISTED PARASITIC PATHOGENS IN THE PACIFIC OYSTER (CRASSOSTREA GIGAS) ON THE SOUTH COAST OF KOREA USING SPECIES-SPECIFIC PCR

Author

Shin, Jong-Seop, Kim, Hyoun Joong, Hwang, Jee Youn, Kwon, Mun Gyeong, Cho, Young-Ghan, and Choi, Kwang-Sik

Subjects
United States. Food and Drug Administration -- International economic relations -- Surveys, Aquaculture industry -- International economic relations, Shipping industry -- International economic relations -- Surveys, Crassostrea -- Surveys, Mariculture -- Surveys, Disease transmission -- Surveys, Oysters -- Surveys, Pathogenic microorganisms -- Surveys, Biological sciences, Zoology and wildlife conservation
Abstract

Outbreaks of oyster diseases caused by the World Organization for Animal Health (OIE)-listed protozoan pathogens have been a global concern for several decades. With the wide application of species-specific and sensitive polymerase chain reaction (PCR) techniques, it is now well known that even the Pacific oyster, insusceptible to Perkinsus marinus, Bonamia ostreae, Bonamia exitiosa could act as a carrier host. Furthermore, one of the transmission pathways of oyster pathogens includes anthropogenic activities, such as the discharge of ballast water or hull attachment during international maritime shipping. In this survey, OIE-listed pathogens, including B. ostreae, B. exitiosa, and Marteilia refringens were screened in the Pacific oysters growing in small bays off the south coast of Korea using PCR with OIE-recommended species- or genus-specific (Bonamia) primers. The survey sampled 1980 oysters from 35 sites in small bays in the south, where more than 95% of the national productions are yielded. The PCR screening indicated that none of the oysters screened in this study were positive for B. ostreae, B. exitiosa, P. marinus, and M. refringens. This study first investigated the OIE-listed protozoan pathogens in the Pacific oysters culturing in Korea, and the results indicated that the Pacific oysters raised on the south coast of Korea are free from those OIE-listed pathogens. For secure and sustainable oyster farming on the south coast, however, regular monitoring of such invasive oyster pathogens is recommended, as the international maritime trade activities are increasing in Korea. KEY WORDS: Crassostrea gigas, OIE-listed protozoan parasite, PCR assay, Korea, INTRODUCTION Oysters have been one of the essential global aquaculture resources, contributing 10.9% of the world production in 2020 (FAO 2022). Despite its rapid growth in the world aquaculture, there [...]

Published
2022
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7. Enhancing viral detection in aquaculture water through virus-microplankton associations and plankton net concentration

Author

Lee, Yoonhang, primary, Kang, Hyo-Young, additional, Roh, HyeongJin, additional, Yun, Dongbin, additional, Park, Jiyeon, additional, Lee, Ju-Yeop, additional, Heo, Young-Ung, additional, Hong, Sung Youl, additional, Jang, Gwang-Il, additional, Kwon, Mun-Gyeong, additional, Han, So-Ri, additional, Kim, Sung-Hyun, additional, Park, Chan-Il, additional, and Kim, Do-Hyung, additional

Published
2024
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47. Detection of Macrobrachium rosenbergii Nodavirus (Mr NV) of White Tail Disease (WTD) in Apparently Healthy Giant Freshwater Prawn, Macrobrachium rosenbergii in Korea.

Author

Jang, Gwang Il, Kim, Bo Seong, Kim, Su Mi, Oh, Yun Kyeong, Kim, Jae Ok, Hwang, Jee Youn, Lee, Soon Jeong, Hong, Sung Youl, and Kwon, Mun Gyeong

Subjects
MACROBRACHIUM rosenbergii, SHRIMPS, FRESH water, STRIATED muscle, ABDOMINAL muscles, AMINO acid sequence
Abstract

White tail disease (WTD) is caused by the Macrobrachium rosenbergii nodavirus (MrNV) and an extra-small virus (XSV). MrNV belongs to the Nodaviridae family. While the role of XSV in the pathogenicity of WTD remains unclear, MrNV is considered to be a significant factor in the disease. To study WTD infection in giant freshwater prawns (Macrobrachium rosenbergii), adult and post-larval (PL) prawns were collected from three giant freshwater prawn farms in Gyeongsangnam-do, Korea in 2021. Although the adult and PL prawns did not display any gross signs of WTD, MrNV was detected in both adult and PL in this study. However, XSV was not detected in both prawns. Phylogenetic analysis revealed that the capsid protein gene sequences of MrNV obtained in this study were robustly clustered with the MrNV group, and were clearly distinguished from Alphanodavirus and Betanodavirus groups of the family Nodaviridae. Although Zenker's necrosis and myolysis were observed histopathologically in the abdominal striated muscle of adult and PL prawns, no gross signs associated with white tail were observed because of local lesions. [ABSTRACT FROM AUTHOR]

Published
2022
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