A study on the effects of an artificial oil-spill on the ultrastructural changes in the digestive glands of Crassostrea gigas
Je Cheon Jun, Se-Won Kang, Moon-Ki Baek, Ji Eun Jeong, Yun Kyung Shin, Young Je Park, Yeon Soo Han and Yong Seok Lee
Aquaculture management Division, NFRDI, Busan 619-705, Korea Department of Parasitology, College of Medicine and UHRC, Inje University, Busan, 614-735, Korea Sea Green Industry Institute, Bucheon, Gyeongi-do, 420-851, Korea Department of Agricultural B
The unwanted artificial oil-spill has severely contaminated the coastal environment in the world. Level of contamination has so far been monitered by various indicator species including mussel, oysters, flounder, and cockle. In this study, we decided to use the oyster as a model organism to observe the morphological changes being exposed to the artificial oil-spill in the coastal areas in Taean, Korea. The oysters were collected from four local sites (Sindu-ri, Uiwang-ri, Jonghyeon-dong, Ansan and Uihang-ri) exposed to various levels of pollution after an oil spill in Taean. Microscopic analysis of the hepatopancreatic microstructure in the digestive gland from the collected oysters show that the swelling, whorl, and destruction phenomenon of the nuclear membrane, a well-known microstructure induced by heavy metal exposure, was observed. Nuclear body (Nb), another typical characteristic of contamination or infection were also observed in some samples. Necrosis was observed in tissue samples collected from the area with a high degree of oil pollution. In addition, parasite-like particles (virus, perkinsus) were observed in most samples. Taken together, these results suggest that oil contamination in the oyster habitats influences the cytopathological changes in Crassostrea gigas.
  
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