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Título

Fipronil and 2,4-D effects on tropical fish: Could avoidance response be explained by changes in swimming behavior and neurotransmission impairments?

AutorAparecida Moreira, Raquel; Araújo, Cristiano V. M. CSIC ORCID CVN ; Silva Pinto, Thandy Junio da; Menezes da Silva, Laís Conceição; Veloso Goulart, Bianca; Viana, Natália Prudêncio; Montagner, Cassiana Carolina; Fernandes, Marisa Narciso; Gaeta Espindola, Evaldo Luiz
Palabras clavePesticides
Danio rerio
Hyphessobrycon eques
Habitat disturbance
Acetylcholinesterase
Fecha de publicaciónene-2021
EditorElsevier
CitaciónChemosphere 263: 127972 (2021)
ResumenBrazil is the largest producer of sugarcane, a crop largely dependent on chemical control for its maintenance. The insecticide fipronil and herbicide 2,4-D stand out among the most commonly used pesticides and, therefore, environmental consequences are a matter of concern. The present study aimed to investigate the toxicity mechanisms of Regent® 800 WG (a.i. fipronil) and DMA® 806 BR (a.i. 2,4-D) pesticides using forced and non-forced exposures through an integrative approach: firstly, to assess whether contamination by fipronil and 2,4-D can trigger the avoidance behavior of the fish Danio rerio (zebrafish) and Hyphessobrycon eques (serpae tetra or mato-grosso). Additionally, the effects on fish were analyzed considering the swimming behavior together with a biomarker of neurotoxicity, the activity of acetylcholinesterase (AChE). In avoidance tests with pesticide gradients, D. rerio avoided the highest concentrations of the two compounds and H. eques avoided only the highest concentration of 2,4-D. The swimming behavior (distance moved) was reduced and AChE was inhibited when D. rerio was exposed to fipronil. The 2,4-D affected the swimming (maximum speed) of H. eques, but AChE was not altered. Avoidance response seemed not to have been affected by possible effects of contaminants on swimming behavior and Ache activity. This study showed the importance of knowing the avoidance capacity, swimming behavior and neurotoxic effects of pesticides on fish in an integrated and realistic context of exposure in environments contaminated with pesticides and can be useful as ecologically relevant tools for ecological risk assessment.
Versión del editorhttps://doi.org/10.1016/j.chemosphere.2020.127972
URIhttp://hdl.handle.net/10261/254175
DOI10.1016/j.chemosphere.2020.127972
ISSN0045-6535
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