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<p>Pollution from gold mining has been a major problem in the Amazon River basin. Mercury in its main organic form, methylmercury (MeHg), is potentially toxic to fish, which are mainly affected by inadequate disposal of this pollutant. The present study aimed to evaluate the cardiac graphoelements over the 1-h exposure of <i>Colossoma macropomum</i> to an immersion bath using different concentrations of MeHg. For that purpose, 45 fish were used, assayed into four groups according to the following concentrations: 10&#xa0;µg/ml, 20&#xa0;µg/ml, 30&#xa0;µg/ml and 40&#xa0;µg/ml MeHg (n = 9). Exposure to different concentrations of MeHg demonstrated the triggering of arrhythmia over the time, and higher concentrations (30 and 40&#xa0;µg/ml) had deleterious cardiac effects, with atrioventricular block. Such effects became more severe depending on the length of the exposure time to MeHg, demonstrating the susceptibility of tambaqui fish <i>C. macropomum</i> to this intoxication.</p>

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Methylmercury causes changes in the cardiac activity of an Amazonian fish (Colossoma macropomum): an electrocardiographic study

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Clarissa Araujo da Paz,
  • Luciana Eiró-Quirino,
  • Daniella Bastos de Araújo,
  • Priscille Fidelis Pacheco Hartcopff,
  • Murilo Farias dos Santos,
  • Rayllan da Cunha Ferreira,
  • Yris da Silva Deiga,
  • Anara de Sousa Barbosa,
  • Luana Vasconcelos de Souza,
  • Maria Klara Otake Hamoy,
  • Gabriela Brito Barbosa,
  • Alejandro Ferraz do Prado,
  • Keuri Eleutério Rodrigues,
  • Luis André Luz Barbas,
  • Nilton Akio Muto,
  • Moisés Hamoy

摘要

Pollution from gold mining has been a major problem in the Amazon River basin. Mercury in its main organic form, methylmercury (MeHg), is potentially toxic to fish, which are mainly affected by inadequate disposal of this pollutant. The present study aimed to evaluate the cardiac graphoelements over the 1-h exposure of Colossoma macropomum to an immersion bath using different concentrations of MeHg. For that purpose, 45 fish were used, assayed into four groups according to the following concentrations: 10 µg/ml, 20 µg/ml, 30 µg/ml and 40 µg/ml MeHg (n = 9). Exposure to different concentrations of MeHg demonstrated the triggering of arrhythmia over the time, and higher concentrations (30 and 40 µg/ml) had deleterious cardiac effects, with atrioventricular block. Such effects became more severe depending on the length of the exposure time to MeHg, demonstrating the susceptibility of tambaqui fish C. macropomum to this intoxication.