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Acute exposure of embryo, larvae and adults of Danio rerio to fipronil commercial formulation reveals effects on development and motor control

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Abstract

The insecticide fipronil, one of the main pesticides used in Brazil, is often detected in natural aquatic environments, and causes neuronal hyperexcitation by inhibiting GABAergic neurotransmission, leading to putative alterations in behaviour and development. This work sought to analyse the toxicity of formulated Regent® 800WG (80% fipronil) on development (fish embryo toxicity test, FET), morphology, and swimming behaviour of larvae and adults of zebrafish (Danio rerio). FET was performed following OECD236 guidelines at concentrations ranging from 0.002 to 1600 μg.L−1 of formulated Regent® 800WG. Adults were exposed to 0.2, 2 and 20 μg.L−1 of the product for 24 and 96 h, and were submitted to the light-dark, novel tank and swimming endurance tests No lethal parameters were observed in larvae, but in concentrations above 400 µg.L−1, there was shortening of the body axis and decreased swimming behavior. In adults, exposure to the pesticide did not lead to changes in free swimming parameters. However, a marked decrease of swimming endurance was observed at all experimental treatments, although probably not in consequence of energetic depletion, since baseline blood glucose levels and condition factor were similar at all conditions. Furthermore, zebrafish adults did not show their natural preference for the dark environment. The pesticide likely has anxiolytic effects on zebrafish, as well as a compromising effect on locomotor control, illustrating that behavioural changes, which could affect activities on the natural environment, such as escape and predation, may occur even in environmentally relevant concentrations of this pollutant.

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Acknowledgements

The authors thank the State University of Londrina and the Laboratory of Animal Ecophysiology for the technical support. ALRC would like to thank Ana Flávia G Campos and Gustavo W Vituri for their assistance recording behavioural tests; and Vinicius Popolin and Caísa Batista for their support with the FET analyses.

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PCM developed the original idea and experimental design, supervised the experiments and data analyses, and edited the paper. ALRC performed all experiments, all analyses, and calculations, and wrote the paper. JDS reviewed the paper, and contributed to the discussion and data interpretation.

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Correspondence to André L. R. Cuenca.

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The authors declare no competing interests.

Ethical approval

The protocols and experiments here described were approved by the Bioethics Committee of the State University of Londrina, license no. 12766.2018.54.

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Cuenca, A.L.R., Simonato, J.D. & Meletti, P.C. Acute exposure of embryo, larvae and adults of Danio rerio to fipronil commercial formulation reveals effects on development and motor control. Ecotoxicology 31, 114–123 (2022). https://doi.org/10.1007/s10646-021-02497-0

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  • DOI: https://doi.org/10.1007/s10646-021-02497-0

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