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Environmentally relevant pesticides induce biochemical changes in Nile tilapia (Oreochromis niloticus)

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Abstract

The high demand for food consequently increases the entry of agricultural residues into water resources, and this phenomenon can affect non-target organisms in different ways. Environmentally relevant pesticide effects (per se or in combinations) are scarce in the scientific literature. Therefore, the aim of this study was to investigate: (1) the presence of pesticide residues in an important Brazilian source of water supply and power generation (Jacuí river), during 1 year of monitoring. (2) in a laboratory study verify the effects of the most frequently, herbicide, fungicide, and insecticide found in Jacuí river (individualized or in a mixture) on biochemical parameters in different tissues of Oreochromis niloticus. Twenty pesticide residues were detected in superficial water samples, and two of them are banned in Brazilian territory. Atrazine (0.56 µg L−1), azoxystrobin (0.024 µg L−1), and imidacloprid (0.11 µg L−1) were the most frequently herbicide, fungicide, and insecticide, respectively, found in the river and were used in the laboratory assay. O. niloticus exposed to the pesticide mixture exhibited more biochemical effects than individualized exposure groups. This response can be a result of the combined pesticide effects, culminating in an additive or synergistic effect, depending on the biomarker. In individual exposure groups, atrazine presented the most pronounced alterations, followed by azoxystrobin and imidacloprid. Overall, pesticide exposure increased levels of oxidative stress parameters, reduced antioxidant enzyme activities, and induced acetylcholinesterase activity. These findings highlight the threat to aquatic organisms which may be exposed to a miscellaneous of toxic compounds in the environment.

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Acknowledgements

This study was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. Vania Lucia Loro received a research fellowship from CNPq (National Research Council), process number: 309314/2017-8. Aline Teixeira Marins received a doctoral fellowship from CAPES. The authors thank the agronomist Rodrigo Roso, Pedro Henrique Pinto Leão, and Renata Teixeira Marins for technical support.

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Correspondence to Vania Lucia Loro.

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The authors declare no competing interests.

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This study was approved by Animal Care Committee at University Federal of Santa Maria, under number: 5537261016.

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Marins, A.T., Severo, E.S., Cerezer, C. et al. Environmentally relevant pesticides induce biochemical changes in Nile tilapia (Oreochromis niloticus). Ecotoxicology 30, 585–598 (2021). https://doi.org/10.1007/s10646-021-02368-8

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  • DOI: https://doi.org/10.1007/s10646-021-02368-8

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