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<p>Metals are pollutants of global concern, causing deleterious risk effects on fish physiological processes. The present study evaluates the toxic effects of cadmium (Cd), mercury (Hg) and their mixture on bullseye puffer (<i>Sphoeroides annulatus</i>) and spotted rose snapper (<i>Lutjanus guttatus</i>) sperm motility. Sperm samples of five mature males of each species were mixed with Cortland’s solution plus different concentrations of Cd, Hg, or the Cd-Hg mixture. The sperm motility percentage in both species was evaluated under a light microscope; as for Cd exposure trial, <i>S. annulatus</i> and <i>L. guttatus</i> sperm motility percentage showed a time and dose-dependent effect. As expected, a deleterious effect was observed at Hg concentrations lower than those of Cd levels. A synergistic effect was observed for the metal mixture (Cd + Hg), since lower sperm motility values were recorded in this experiment than those of the individual bioassays. The present research is of ecological concern in fishes with external fertilization inhabiting coastal zones with high Cd and Hg levels, affecting the reproductive success.</p>

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Effects of Cadmium, Mercury and Their Mixture on Sphoeroides annulatus and Lutjanus guttatus Sperm Motility

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Marisela Aguilar-Juárez,
  • Tania Sarabia-Espinoza,
  • Carmen Paniagua-Chávez,
  • Leonardo Ibarra-Castro,
  • Carmen Cristina Osuna-Martínez,
  • Martín Gabriel Frías-Espericueta

摘要

Metals are pollutants of global concern, causing deleterious risk effects on fish physiological processes. The present study evaluates the toxic effects of cadmium (Cd), mercury (Hg) and their mixture on bullseye puffer (Sphoeroides annulatus) and spotted rose snapper (Lutjanus guttatus) sperm motility. Sperm samples of five mature males of each species were mixed with Cortland’s solution plus different concentrations of Cd, Hg, or the Cd-Hg mixture. The sperm motility percentage in both species was evaluated under a light microscope; as for Cd exposure trial, S. annulatus and L. guttatus sperm motility percentage showed a time and dose-dependent effect. As expected, a deleterious effect was observed at Hg concentrations lower than those of Cd levels. A synergistic effect was observed for the metal mixture (Cd + Hg), since lower sperm motility values were recorded in this experiment than those of the individual bioassays. The present research is of ecological concern in fishes with external fertilization inhabiting coastal zones with high Cd and Hg levels, affecting the reproductive success.