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<p>Ecotoxicological studies on the effects of harmful heavy metals including hexavalent chromium Cr(VI), on aquatic ecosystems have increased dramatically in recent years. Moreover, biological factors like species, age, and developmental stage are crucial in determining the ecotoxicological effects. This was the first-ever study to evaluate the acute toxicity (96&#xa0;h-LC50) of Cr(VI) on <i>Chanos chanos</i> fry (average weight 2.5 ± 0.5&#xa0;g, length 6.5 ± 1&#xa0;cm) in freshwater. Seven Cr(VI) treatment groups and one control group (10 fry each) were tested for mortality, morphological, behavioural and histopathological alterations. The median lethal concentration (LC<sub>50</sub>) was determined as 31.22&#xa0;mg/L by probit analysis, and a safe concentration factor of 0.01 was applied to estimate the allowable safe level. This investigation provides valuable insights into the ecotoxicology and risk assessment of Cr(VI), with potential implications for culturing euryhaline fish in chromium-contaminated freshwater for species diversification.</p>

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Acute Toxicity and Safe Level of Hexavalent Chromium to Euryhaline Milkfish in Freshwater Synergising with Morphological, Behavioural and Histological Indices

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Kurapati Nagendrasai,
  • Kishore Kumar Krishnani,
  • Ajit Kumar Verma,
  • Dhruba Jyoti Sarkar,
  • Pankaj Amrut Patil,
  • Nalini Poojary,
  • Arun Sharma,
  • Geeta Mahto,
  • Gayatri Tripathi

摘要

Ecotoxicological studies on the effects of harmful heavy metals including hexavalent chromium Cr(VI), on aquatic ecosystems have increased dramatically in recent years. Moreover, biological factors like species, age, and developmental stage are crucial in determining the ecotoxicological effects. This was the first-ever study to evaluate the acute toxicity (96 h-LC50) of Cr(VI) on Chanos chanos fry (average weight 2.5 ± 0.5 g, length 6.5 ± 1 cm) in freshwater. Seven Cr(VI) treatment groups and one control group (10 fry each) were tested for mortality, morphological, behavioural and histopathological alterations. The median lethal concentration (LC50) was determined as 31.22 mg/L by probit analysis, and a safe concentration factor of 0.01 was applied to estimate the allowable safe level. This investigation provides valuable insights into the ecotoxicology and risk assessment of Cr(VI), with potential implications for culturing euryhaline fish in chromium-contaminated freshwater for species diversification.