전자저널 > 전자저널 > Copper Toxicity on Survival, Respiration and Organ Structure of Mactra veneriformis (Bivalvia: Mactridae)

Copper Toxicity on Survival, Respiration and Organ Structure of Mactra veneriformis (Bivalvia: Mactridae)

Yun Kyung Shin, Jung Jun Park, Hyun Sig Lim and Jung Sick Lee

Aquaculture Management Division, Aquaculture Research Institute, NFRDI, Busan 619-902, Korea Department of Marine and Fisheries Resources, Mokpo National University, Muan 534-729, Korea Department of Aqualife Medicine, Chonnam National University, Yeo

This study was conducted to find out the changes of survivorship, respiration and organ structure of Mactra veneriformis exposed to copper (Cu). Experimental period was four weeks. Experimental groups were composed of one control condition and three copper exposure conditions (0.025, 0.050 and 0.100 mg/L). The results of the study confirmed that copper induces reduction of survival rate and respiration rate and histopathology of organ structure of the bivalve. In the copper concentration of 0.100 mg/L, mortality was 100% after Cu exposure of 3 weeks. Respiration rate was observed exposure groups lower than control decline by 75%. Histological analysis of organ system illustrated expansion of hemolymph sinus, disappearance of epidermal layer and degeneration of connective tissue layer of the mantle. Also, histological degenerations as epithelial necrosis and hyperplasia of mucous cells are recognized in the gill and it was observed expansion of hemolymph sinus, disruption of epithelial layer, decrease of mucous cell and degeneration of connective tissue layer in the foot. In the digestive diverticulum, it was showed atrophy of basophilic cell and degeneration of epithelial cell in the digestive tubules, and as the concentration of copper increased the accumulation of lipofuscin increased.

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