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<p>This study evaluated the antiparasitic efficacy of aqueous extracts from six tropical seaweeds (<i>Gracilaria verrucosa, Kappaphycus alvarezii, Halymenia durvillei, Sargassum polycystum, Caulerpa racemosa</i>, and <i>Halimeda macroloba</i>) against ectoparasites of goldfish (<i>Carassius auratus</i>). Fish were treated with a 200&#xa0;mg L<sup>−1</sup> extract concentration for 30&#xa0;min, similar to salt dip procedures, and monitored for parasite prevalence, intensity, abundance, clinical symptoms, and survival. Pre-treatment prevalence of <i>Trichodina</i> sp., <i>Gyrodactylus</i> sp., and <i>Dactylogyrus</i> sp. was 100% across all groups. By post-maintenance, <i>Trichodina</i> was eliminated in all groups, with <i>C. racemosa</i> and <i>H. macroloba</i> showing a &gt; 60% reduction in parasite abundance. In contrast, <i>G. verrucosa</i> and <i>S. polycystum</i> yielded a 12–22% reduction but showed higher survival rates (87.5–90%), suggesting enhanced host tolerance. Clinical symptoms such as slime and scale loss were reduced by 40–70%, with <i>G. verrucosa</i> showing significant improvement (p &lt; 0.05). Behavioral recovery was observed in all groups by post-maintenance. Phytochemical screening confirmed the presence of bioactive compounds, including saponins, flavonoids, and tannins. These findings demonstrate that seaweed extracts can reduce parasite load (<i>Caulerpa, Halimeda</i>) and improve host health (<i>Gracilaria, Sargassum</i>), suggesting their potential as sustainable, non-toxic antiparasitic agents in aquaculture.</p>

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Antiparasitic efficacy of aqueous extracts from selected tropical seaweed species against goldfish (Carassius auratus) parasite infestations

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Seto Windarto,
  • Yolania Anita Sari,
  • Yusuf Jati Wijaya,
  • Asriati Djonu,
  • Nur Maulida Safitri

摘要

This study evaluated the antiparasitic efficacy of aqueous extracts from six tropical seaweeds (Gracilaria verrucosa, Kappaphycus alvarezii, Halymenia durvillei, Sargassum polycystum, Caulerpa racemosa, and Halimeda macroloba) against ectoparasites of goldfish (Carassius auratus). Fish were treated with a 200 mg L−1 extract concentration for 30 min, similar to salt dip procedures, and monitored for parasite prevalence, intensity, abundance, clinical symptoms, and survival. Pre-treatment prevalence of Trichodina sp., Gyrodactylus sp., and Dactylogyrus sp. was 100% across all groups. By post-maintenance, Trichodina was eliminated in all groups, with C. racemosa and H. macroloba showing a > 60% reduction in parasite abundance. In contrast, G. verrucosa and S. polycystum yielded a 12–22% reduction but showed higher survival rates (87.5–90%), suggesting enhanced host tolerance. Clinical symptoms such as slime and scale loss were reduced by 40–70%, with G. verrucosa showing significant improvement (p < 0.05). Behavioral recovery was observed in all groups by post-maintenance. Phytochemical screening confirmed the presence of bioactive compounds, including saponins, flavonoids, and tannins. These findings demonstrate that seaweed extracts can reduce parasite load (Caulerpa, Halimeda) and improve host health (Gracilaria, Sargassum), suggesting their potential as sustainable, non-toxic antiparasitic agents in aquaculture.