Abstract
Diclofenac residues have been found in surface water, and thus could present a potential risk to aquatic species. The aim of this study was to assess the impact of diclofenac on the mortality, growth, and development of fish, as well as the impact of the drug on histological changes and selected parameters of oxidative stress in the fish. Subchronic toxic effects of diclofenac at concentrations of 0.015, 0.03, 1, and 3mg/L on embryos and larvae of common carp (Cyprinus carpio) were investigated during a 30-day toxicity test under experimental conditions. Exposure to diclofenac at 3mg/L was associated with increased mortality, increased activity of glutathione S-transferase, and decreased activity of glutathione reductase. Decreases in the levels of thiobarbituric-acid-reactive substances were associated with concentrations ≥0.03mg/L. Based on these results a no observed effect concentration (NOEC)=0.015mg/L and lowest observed effect concentration (LOEC)=0.03mg/L were generated.
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