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Acute toxicity of the pesticide trichlorfon and inhibition of acetylcholinesterase in Colossoma macropomum (Characiformes: Serrasalmidae)

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Abstract

In Brazilian fish farms, trichlorfon has been widely used to control acanthocephalan infections in Colossoma macropomum. Toxicity tests were conducted to estimate the median lethal concentration (LC50–96 h) and evaluate the effects of trichlorfon on acetylcholinesterase (AChE) and glutathione S-transferase (GST) from different tissues of C. macropomum. The LC50–96 h of trichlorfon was estimated to be 0.87 mg L−1. In the sublethal toxicity tests, concentrations of 0.26 mg L−1 (30% of LC50–96 h) and 0.43 mg L−1 (50% of LC50–96 h) were used. AChE and GST activities were measured in the brain, muscle, intestine, and liver. In vitro studies were conducted to estimate the kinetic properties and half-maximal inhibitory concentration (IC50) values of AChE in the brain and muscle for trichlorfon. In the sublethal toxicity experiments, inhibition of more than 90% of AChE in the brain, muscle, and intestine was observed. However, the activity of GST did not vary in any of the tissues studied. This finding suggests that trichlorfon is not metabolised by this enzyme. The in vitro assay results suggest that trichlorfon tends to be a classic uncompetitive inhibitor of AChE in both the brain and muscle, since Km and Vmax values decrease, while the slope remains unchanged. The IC50 values ​of muscle AChE are lower than those of the brain. All these results show that C. macropomum has low tolerance to this pesticide and suggest that brain AChE can be used as a biochemical biomarker, while muscle AChE may be used as an indicator of mortality in toxicological studies.

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Acknowledgements

This study was partially supported by the ADAPTA project (Adaptações da Biota Aquática da Amazônia)/CNPq/FAPEAM. The authors would like to thank Fabrício Barros de Sousa, Raony César Belém, Maria dos Santos Costa, Rubia Neris Machado, Vinicius Barbosa Costa, Karina Francis de Souza Barbosa, Luana da Silva Nonato, Pedro Vinicius Rodrigues Nunes, and Teresa Cristina for their assistance.

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Correspondence to Wallice Paxiúba Duncan.

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All experiments were approved by the Ethics Committee for Animal Experimentation (#030/2018 - CEUA/UFAM).

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The authors declare that they have no conflicts of interest.

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Duncan, W.P., Idalino, J.J.S., da Silva, A.G. et al. Acute toxicity of the pesticide trichlorfon and inhibition of acetylcholinesterase in Colossoma macropomum (Characiformes: Serrasalmidae). Aquacult Int 28, 815–830 (2020). https://doi.org/10.1007/s10499-019-00497-w

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  • DOI: https://doi.org/10.1007/s10499-019-00497-w

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