The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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A report on the mass summer mortalities of the farmed Pacific oysters, Crassostrea gigas and Bay scallops Argopecten irradians in the local waters of Goseong Bay, Korea

  • Han, Jong Cheol (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Jo, Qtae (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Park, Young Cheol (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Park, Tae Gyu (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Lee, Deok Chan (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Cho, Kee-Chae (Southeast Sea Fisheries Research Institute, NFRDI)
  • Received : 2013.09.13
  • Accepted : 2013.09.27
  • Published : 2013.09.30
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Abstract

Mass mortalities of farmed shellfish, mostly in summer season, thus named mass summer mortalities, have been a global issue in shellfish aquaculture. The 2013 mass summer mortalities in the confined waters of Goseong Bay, Goseong, Korea were quite a unique and intensive for two farmed species, the Pacific oysters, Crassostrea gigas, and bay scallops, Argopecten irradians. The mortalities were progressive from the bottom of the suspended oysters and caged scallops in the waters, reaching up to 80% for the oyster and 95% for the scallop in about 20 days after the first occurrence, early August, 2013. We monitored a wide range of environmental factors, including water temperature, dissolved oxygen (DO), salinity, turbidity, acidity (pH), organic and inorganic matters, chemical oxygen demand (COD), suspected pathogenic agent, and phytoplankton composition throughout the water column where the two species were suspended or caged. Our survey concluded that the hypoxia or anoxia might be a major cause of the mortalities. Here, we detailed the mortalities and ways to arrive at the conclusion.

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References

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