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<p>The ecotoxicological impacts of oxybenzone gain much more attention due to its widespread use and release in aquatic environments. In the present study, <i>Labeo rohita</i> fingerlings were exposed to 3.8, 4, 4.2, and 4.4&#xa0;mg L<sup>−1</sup> concentrations of oxybenzone for 96&#xa0;h. The 96-h median lethal concentration (LC<sub>50</sub>) of oxybenzone was evaluated as 4.05&#xa0;mg L<sup>−1</sup> and also predicted survivability through GUTS-Model (General Unified Threshold Model). Acute exposure to oxybenzone has caused different behavioural deviations, including opercular movement, upside-down swimming and jumping tendency. Various tissue architectural alterations of the gill [inter lamellar space, partial fusion of Secondary Gill Lamellae (SGL), curling of SGL, blood congestion in the filament)] and liver (necrotic hepatocytes, blood congestion, pyknotic nucleus, large number of phagocyte cells, rupturing of the cell structure, fatty infiltration) were observed in treated groups. Haematological parameters, such as Hb content (Haemoglobin), TEC (Total Erythrocyte Count), PCV (Packed Cell Volume), MCH (Mean Corpuscular Haemoglobin), MCV (Mean Corpuscular Volume) and MCHC (Mean Corpuscular Haemoglobin Concentration), were significantly decreased in treated groups in a dose-dependent manner, whereas TLC (Total Leucocyte Count) level was increased significantly. Considering the toxicological effects of oxybenzone, the study emphasised the need to regulate its use and ensure safer disposal for environmental safety.</p>

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Acute oxybenzone exposure induces behavioural, histological and haematological responses in Labeo rohita (Hamilton, 1822) fingerlings

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Suman Karmakar,
  • Kuntal Krishana Bera,
  • Sayantan Bhattacharjee,
  • Sutanu Karmakar,
  • Sangram Keshari Rout,
  • Gour Hari Pailan,
  • Bipul Kumar Das

摘要

The ecotoxicological impacts of oxybenzone gain much more attention due to its widespread use and release in aquatic environments. In the present study, Labeo rohita fingerlings were exposed to 3.8, 4, 4.2, and 4.4 mg L−1 concentrations of oxybenzone for 96 h. The 96-h median lethal concentration (LC50) of oxybenzone was evaluated as 4.05 mg L−1 and also predicted survivability through GUTS-Model (General Unified Threshold Model). Acute exposure to oxybenzone has caused different behavioural deviations, including opercular movement, upside-down swimming and jumping tendency. Various tissue architectural alterations of the gill [inter lamellar space, partial fusion of Secondary Gill Lamellae (SGL), curling of SGL, blood congestion in the filament)] and liver (necrotic hepatocytes, blood congestion, pyknotic nucleus, large number of phagocyte cells, rupturing of the cell structure, fatty infiltration) were observed in treated groups. Haematological parameters, such as Hb content (Haemoglobin), TEC (Total Erythrocyte Count), PCV (Packed Cell Volume), MCH (Mean Corpuscular Haemoglobin), MCV (Mean Corpuscular Volume) and MCHC (Mean Corpuscular Haemoglobin Concentration), were significantly decreased in treated groups in a dose-dependent manner, whereas TLC (Total Leucocyte Count) level was increased significantly. Considering the toxicological effects of oxybenzone, the study emphasised the need to regulate its use and ensure safer disposal for environmental safety.