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<p><i>Vibrio alginolyticus</i>, a bacterium exhibiting extensive pathogenicity toward both humans and diverse marine organisms, has been identified as the pathogen of "Baotou" disease in the red alga <i>Gracilariopsis lemaneiformis</i>. China’s <i>G. lemaneiformis</i> production was severely reduced in recent years due to "Baotou" disease outbreaks. To understand the ecological risks of disease outbreaks and to reduce its risk, the environmental adaptability (temperature, salinity, and pH) of <i>V. alginolyticus</i> ZB10, isolated during a "Baotou" disease outbreak in <i>G. lemaneiformis,&#xa0;</i>was investigated in this study. The results demonstrated that ZB10 maintained rapid proliferation under salinity 20-40 ‰, pH 7.6-8.2, and 9-30 °C. China’s seasonal migration cultivation strategy for <i>G. lemaneiformis</i> between South and North China, coupled with the environmental parameters of farming areas, could create favorable conditions for ZB10 dissemination while simultaneously maintaining optimal growth conditions year-round for it. Notably, a 12-h freshwater treatment induced <i>V. alginolyticus</i> ZB10 cell lysis, effectively inactivated the pathogen, while exerted no significant effects on the physiological indices of <i>G. lemaneiformis</i> (F<sub>v</sub>/F<sub>m</sub>, SOD activity, MDA content) and its daily growth rate. Furthermore, laboratory simulation experiments on the infection of pathogenic ZB10 showed that the freshwater treatment method can also significantly reduce the number of decayed spots caused by ZB10 infection. Integrated with existing aquaculture practices, freshwater treatment shows potential as a selective method to prevent trans-regional transmission of pathogenic <i>Vibrio alginolyticus</i> ZB10 during <i>G. lemaneiformis</i> seedling transportation.</p>

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Freshwater treatment shows potential as a selective method to prevent trans-regional transmission of pathogenic Vibrio alginolyticus ZB10 during Gracilariopsis lemaneiformis seedling transportation

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Feng Wang,
  • Zhenhua Wang,
  • Bo Pang,
  • Qunqun Guo,
  • Jianguo Liu,
  • Tong Pang

摘要

Vibrio alginolyticus, a bacterium exhibiting extensive pathogenicity toward both humans and diverse marine organisms, has been identified as the pathogen of "Baotou" disease in the red alga Gracilariopsis lemaneiformis. China’s G. lemaneiformis production was severely reduced in recent years due to "Baotou" disease outbreaks. To understand the ecological risks of disease outbreaks and to reduce its risk, the environmental adaptability (temperature, salinity, and pH) of V. alginolyticus ZB10, isolated during a "Baotou" disease outbreak in G. lemaneiformis, was investigated in this study. The results demonstrated that ZB10 maintained rapid proliferation under salinity 20-40 ‰, pH 7.6-8.2, and 9-30 °C. China’s seasonal migration cultivation strategy for G. lemaneiformis between South and North China, coupled with the environmental parameters of farming areas, could create favorable conditions for ZB10 dissemination while simultaneously maintaining optimal growth conditions year-round for it. Notably, a 12-h freshwater treatment induced V. alginolyticus ZB10 cell lysis, effectively inactivated the pathogen, while exerted no significant effects on the physiological indices of G. lemaneiformis (Fv/Fm, SOD activity, MDA content) and its daily growth rate. Furthermore, laboratory simulation experiments on the infection of pathogenic ZB10 showed that the freshwater treatment method can also significantly reduce the number of decayed spots caused by ZB10 infection. Integrated with existing aquaculture practices, freshwater treatment shows potential as a selective method to prevent trans-regional transmission of pathogenic Vibrio alginolyticus ZB10 during G. lemaneiformis seedling transportation.