Özet:

Terbium (Tb) is a rare earth element (REE) that can become toxic to aquatic organisms when present in high concentrations in the aquatic environment. There are still not enough studies on the oxidative stress consequences of Tb toxicity in the freshwater ecosystem. In this study, the freshwater creature Pontastacus leptodactylus was used to evaluate the oxidative stress consequences of Tb. The oxidative stress and antioxidant changes caused by Tb at 1, 5 and 25 mg/L concentrations at 24 and 96 hours in P. leptodactylus, were affected by the enzyme activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), catalase (CAT) and thiobarbituric acid (TBARS) and reduced levels of glutathione (GSH) were determined. Results were determined using ELISA kits. SPSS 24.0 package program one-way ANOVA (Duncan 0.05) test was used in the statistical evaluation of biomarker analyses. While no significant change was observed in SOD activity (p>0.05) compared to the control group, significant decreases were observed in CAT and GPx activities (p<0.05); Significant (p<0.05) increases were observed in GSH and TBARS levels. Considering the study data, it is concluded that the TB xenobiotic that penetrates the body of living organisms causes oxidative stress in the organism.

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