Zinc Exposure in Cyprinus carpio: Study Reveals Toxic Effects on Biochemical Parameters

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Research from Wasit University has shed light on the effects of zinc exposure in Cyprinus carpio, a common carp species. The study found that exposure to zinc concentrations exceeding 150 mg/L for 96 hours led to significant increases in liver enzymes, malondialdehyde, and glutathione peroxidase activity, while also causing a decrease in catalase levels. Moreover, gene expression of metallothionein (MT) increased in treated groups, indicating exposure to metals and environmental stresses. These findings suggest that biochemical parameters and gene expression in Cyprinus carpio can serve as reliable markers of cellular and humoral immune responses.

Key Takeaways:

  • The study demonstrated that zinc concentrations exceeding 150 mg/L for 96 hours led to significant increases in liver enzymes, malondialdehyde, and glutathione peroxidase activity in Cyprinus carpio.
  • Exposure to zinc caused a decrease in catalase levels, which plays a crucial role in antioxidant defense mechanisms.
  • Gene expression of metallothionein (MT) increased in treated groups, indicating exposure to metals and environmental stresses.
  • The research highlighted the importance of biochemical parameters and gene expression in Cyprinus carpio as reliable markers of cellular and humoral immune responses.
  • The study's findings suggest that zinc exposure can have toxic effects on aquatic organisms, such as Cyprinus carpio.

Statistics:

  • 150 mg/L: The median lethal concentration of Zn for 96 hours.
  • 10 mg/L, 30 mg/L, and 50 mg/L: Safe concentrations of Zn exposure.
  • 75, 100, 125, 150, and 175 mg/L: Concentrations of Zn exposure used in the study.
  • 3 and 6 weeks: Time periods studied for zinc exposure effects.
  • 392.8% and 441.2% increase: Increases in alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels, respectively.
  • 231.4% increase: Increase in malondialdehyde (MDA) levels.
  • 319.2% and 417.8% increase: Increases in glutathione peroxidase (GPX) activity, respectively.
  • 146.4% increase: Increase in metallothionein (MT) concentration.

Sources:

  • Effect of water pollution by zinc on common carp (Cyprinus carpio) biochemical parameters and glutathione peroxidase and metallothionein gene expression. Journal of Degraded and Mining Lands Management, 2025,12(4):8315-8324.
  • Wasit University Researchers Detail New Studies and Findings in the Area of Metalloproteins [Effect of water pollution by zinc on common carp (Cyprinus carpio) biochemical parameters and glutathione peroxidase and metallothionein gene expression]. Life Science Weekly. July 15, 2025; p 4547.