The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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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

2007년 봄 인천만 갯벌에 있어 폭풍으로 인한 갯벌의 침식작용에 의해 대기 중으로 노출된 바지락 (Ruditapes philippinarum)의 조직병리학적 특성에 관한 연구

  • Park, Kwang-Jae (Tidal Flat Research Institute, National Fisheries Research and Development Institute) ;
  • Yang, Hyun-Sung (East Sea Research Institute, Korea Institute of Ocean Science and Technology) ;
  • Jeung, Hee-Do (School of Marine Biomedical Science, Jeju National University) ;
  • Choi, Kwang-Sik (School of Marine Biomedical Science, Jeju National University)
  • 박광재 (국립수산과학원 갯벌연구소) ;
  • 양현성 (한국해양과학원 동해연구소) ;
  • 정희도 (제주대학교 해양의생명과학부) ;
  • 최광식 (제주대학교 해양의생명과학부)
  • Received : 2013.06.18
  • Accepted : 2013.06.27
  • Published : 2013.06.30
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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.

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References

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