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Pathologic condition of the stranded Manila clam Ruditapes philippinarum by storm-originated sediment erosion in spring 2007 in Incheon Bay off the west coast of Korea
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  • Journal title : The Korean Journal of Malacology
  • Volume 29, Issue 2,  2013, pp.147-154
  • Publisher : The Malacological Society of Korea
  • DOI : 10.9710/kjm.2013.29.2.147
 Title & Authors
Pathologic condition of the stranded Manila clam Ruditapes philippinarum by storm-originated sediment erosion in spring 2007 in Incheon Bay off the west coast of Korea
Park, Kwang-Jae; Yang, Hyun-Sung; Jeung, Hee-Do; Choi, Kwang-Sik;
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 Abstract
In Incheon bay, mass mortalities of Manila clam associated with winter storms have been reported. In the present study we have monitored pathologic condition of the clams stranded on the tidal flats by the winter storms occurred in late March to early April in 2007. The field surveyed indicated that mortality of the Manila clam in the study areas ranged 10-15%. Condition index, a ratio of tissue weight to the shell weight, of the stranded clams was significantly lower than the non-stranded normal clams collected from the same locations (p < 0.05), indicating that the stranded clams were comparatively in poor physiological condition. Perkinsus olseni, the protozoan parasite was observed most of clams used in the analysis and the infection prevalence ranged 77-90%. The infection intensity of P. olseni determined using Ray's fluid thioglycollate medium (RFTM) cultivation and the 2M NaOH digestion assay indicated that the clams collected during late March and early April in 2007 involved 67,182-1,124,727 P. olseni cells/g tissue. The infection intensity of clams from Gung-Pyeung was significantly higher than the intensities observed from Dae-Bu and Young-Heung (p < 0.05). No clear correlation was found between the infection intensities of P. olseni in the non-stranded normal clams and the stranded clams. The stranded Manila clams were also infected with trematode parasite with the prevalence ranged 5 (Young-Heung) to 12.5% (Dae-Bu). The trematode-infected clams exhibited castrated follicles in the gonad, a typical sign of trematode infection. It was believed that mass mortality of Manila clam observed in this study was associated with the poor physiological condition as indicated by CI, although impacts of the parasite infection cannot be ruled out.
 Keywords
Ruditapes philippinarum;winter storm;stranding;mortality;pathologic condition;
 Language
Korean
 Cited by
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서해안 바지락 양식장의 서식환경과 서식밀도의 변화,박광재;송재희;최윤석;안경호;

한국패류학회지, 2013. vol.29. 3, pp.207-216 crossref(new window)
2.
Hebei spirit호 유류유출과 서해안 바지락 양식장의 변화,박광재;김수경;강덕영;송재희;

한국패류학회지, 2015. vol.31. 3, pp.213-220 crossref(new window)
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Changes in density and culture conditions of the Manila Clam Ruditapes philippinarum on the West coast of Korea, The Korean Journal of Malacology, 2013, 29, 3, 207  crossref(new windwow)
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Oil spill of Hebei spirit and Change of Manila Clam, Ruditapes philippinarum beds in the West coast of Korea, The Korean Journal of Malacology, 2015, 31, 3, 213  crossref(new windwow)
3.
Effects of environmental and biological conditions on the recruitment and growth of the Manila clam Ruditapes philippinarum on the west coast of Korea, Ocean Science Journal, 2017, 52, 1, 91  crossref(new windwow)
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