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<p>This study examined tissue-specific oxidative stress responses in juvenile <i>Colossoma macropomum</i> during 72&#xa0;h of hypoxia (0.92 ± 0.37&#xa0;mg L⁻<sup>1</sup> O₂) followed by reoxygenation. The liver showed increased reduced glutathione (GSH) during hypoxia and recovery, while brain GSH remained stable, indicating differential antioxidant regulation. Lipid peroxidation (TBARS) decreased in the liver but increased in the brain during hypoxia, suggesting tissue-specific vulnerability. Hypoxia triggered feeding cessation, but full recovery occurred within 48&#xa0;h post-stress. These findings underscore the resilience of <i>C. macropomum</i> to hypoxia, with targeted metabolic adjustments that could guide aquaculture strategies, such as stress-tolerant stock selection or optimized recovery protocols, to enhance productivity in oxygen-variable systems.</p>

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Oxidative stress biomarker responses in juvenile Colossoma macropomum during hypoxia and reoxygenation

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Cristiano Campos Mattioli,
  • Gisele Cristina Favero,
  • Luanna do Carmo Neves,
  • Hugo Napoleão Pereira da Silva,
  • Bernardo Baldisserotto,
  • Ronald Kennedy Luz

摘要

This study examined tissue-specific oxidative stress responses in juvenile Colossoma macropomum during 72 h of hypoxia (0.92 ± 0.37 mg L⁻1 O₂) followed by reoxygenation. The liver showed increased reduced glutathione (GSH) during hypoxia and recovery, while brain GSH remained stable, indicating differential antioxidant regulation. Lipid peroxidation (TBARS) decreased in the liver but increased in the brain during hypoxia, suggesting tissue-specific vulnerability. Hypoxia triggered feeding cessation, but full recovery occurred within 48 h post-stress. These findings underscore the resilience of C. macropomum to hypoxia, with targeted metabolic adjustments that could guide aquaculture strategies, such as stress-tolerant stock selection or optimized recovery protocols, to enhance productivity in oxygen-variable systems.