Parasitic infection in the Pacific oyster, Crassostrea gigas, reared by intertidal rack culture in Wando Coast, Korea
Woo-Geon Jeong and Sang-Man Cho
Department of Seafood and Aquaculture Science& Institute of Marine Industry, Geyongsan National University, Chonchidaeguk-gil 38, Tongyeong 53064, Korea Faculty of Marine applied biosciences, Kunsan National University, Deahak-ro 558, Gunsan 54150, Korea
In the tidal flat oyster rack culture introduced in 2010, we investigated the parasitic infection from November 2015 to June 2017. The water temperature and salinity were ranged from 7.32℃ to 27.18℃ and from 27.6 psu to 32.7 psu, respectively. From the two serial growth experiments, commercial market sized oysters can be achieved within 18 months, one size group from the 2015 population with 88.67 ± 7.52 mm in shell length, 79.74 ± 13.33 g in total weight in August 2016 and, and the another from the 2016 population with 93.77 ± 12.11 mm in shell length, 78.99 ± 20.84 g in total weight in June 2017, respectively. Sex ratio represented at 1:1 ratio being closed to mature season but some intersex oysters were observed in immature period. Parasitic infection was ranged from 26 to 100% in prevalence and from 1.6 to 4.0 in intensity, which being associated with water temperature and gonad development index. Using the PNA clamping PCR, the parasite was identified as Apicomplexa which including Perkinsiosis pathogen in manila clam. There is no evidence which Apicomplexa can negatively affect cultural performance of oyster but more elaborated studies are necessary to maintain the sustainability of the rack oyster culture in Wando coast, Korea.
  
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