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<p>Neonicotinoid insecticides such as nitenpyram pose potential risks to freshwater aquaculture species, yet their chronic effects on Chinese Longsnout Catfish remain unclear. Here, juvenile <i>L. longirostris</i> (12.5 ± 1.0&#xa0;g; 8.2 ± 0.5&#xa0;cm) were exposed to 0, 10, 100, and 1000&#xa0;µg/L nitenpyram for 60 days under static-renewal conditions. Growth performance, oxidative stress, liver histopathology, and gut microbiota were assessed. Significant adverse effects occurred at ≥ 100&#xa0;µg/L, including growth inhibition (weight gain 18.3–42.5%), oxidative stress (SOD and CAT 21.7–58.2%; MDA 35.6–89.1%), hepatic injury (vacuolation, nuclear pyknosis), and gut dysbiosis (alpha diversity 15.2–32.7%; beneficial bacteria; pathogens). No effects were detected at 10&#xa0;µg/L, suggesting a no-observed-effect concentration near this level. Overall, chronic nitenpyram exposure at ≥ 100&#xa0;µg/L impairs growth, redox balance, and microbial homeostasis in <i>L. longirostris</i>, posing ecological risks to aquaculture and freshwater ecosystems.</p>

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Integrated assessment of Nitenpyram-induced physiological and microbial alterations in Chinese longsnout catfish

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Yang Liu,
  • Han Zhao,
  • Chengyan Mou,
  • Zhongmeng Zhao,
  • Lu Zhang,
  • Huadong Li,
  • Qiang Li,
  • Jian Zhou

摘要

Neonicotinoid insecticides such as nitenpyram pose potential risks to freshwater aquaculture species, yet their chronic effects on Chinese Longsnout Catfish remain unclear. Here, juvenile L. longirostris (12.5 ± 1.0 g; 8.2 ± 0.5 cm) were exposed to 0, 10, 100, and 1000 µg/L nitenpyram for 60 days under static-renewal conditions. Growth performance, oxidative stress, liver histopathology, and gut microbiota were assessed. Significant adverse effects occurred at ≥ 100 µg/L, including growth inhibition (weight gain 18.3–42.5%), oxidative stress (SOD and CAT 21.7–58.2%; MDA 35.6–89.1%), hepatic injury (vacuolation, nuclear pyknosis), and gut dysbiosis (alpha diversity 15.2–32.7%; beneficial bacteria; pathogens). No effects were detected at 10 µg/L, suggesting a no-observed-effect concentration near this level. Overall, chronic nitenpyram exposure at ≥ 100 µg/L impairs growth, redox balance, and microbial homeostasis in L. longirostris, posing ecological risks to aquaculture and freshwater ecosystems.