Do Manganese and Iron in Association Cause Biochemical and Genotoxic Changes in Oreochromis Niloticus (Teleostei: Cichlidae)?

• Published in: Bulletin of environmental contamination and toxicology 2022-04, Vol.108 (4), p.708-715
• Main Authors: Passos, Larissa Souza, Coppo, Gabriel Carvalho, Pereira, Tatiana Miura, Teixeira, Barbara Chisté, Bona, Alliny Magalhães, Merçon, Julia, Lopes, Taciana Onesorge Miranda, Chippari-Gomes, Adriana Regina
• Format: Article
• Language: English
• Subjects: Animals; Aquatic Pollution; Bioassays; Biochemistry; Biota; Comet assay; DNA damage; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Erythrocytes; Exposure; Genotoxicity; Heavy metals; Iron; Manganese; Metal concentrations; Metals; Oreochromis niloticus; Pollution; Soil Science & Conservation; Tilapia; Toxicity; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 0007-4861; 1432-0800
• DOI: 10.1007/s00128-021-03382-6

The present study aimed to evaluate the toxicity of the association between Fe and Mn in Oreochromis niloticus through genotoxic (micronucleus test and comet assay) and biochemical (CAT and GST enzymes) assays. The tested treatments were T1 = control group (without metal addition), T2 = 2.60 mg L −1 of Fe + 0.2 mg L −1 of Mn, and T3 = 4.40 mg L −1 of Fe + 3.49 mg L −1 of Mn, during 96-h bioassays. All animals exposed to the metals showed a significant increase in erythrocyte micronucleus frequency and DNA damage. The hepatic GST activity increased two times in animals exposed to T3 compared to the control group. The results indicate that Fe + Mn caused genotoxic and biochemical changes in exposed fish. Therefore, excess metals in ecosystems, even those essential for organisms, can be dangerous for the local biota due to the risk associated with high concentrations of these metals.