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<p>Arsenic (As) bioaccumulation in freshwater food webs remains poorly understood despite widespread contamination in South Asia's Ganges basin. This study investigated tissue-specific As accumulation in two ecologically distinct cyprinid species, <i>Labeo rohita</i> and <i>Catla catla</i>, across 13 districts in West Bengal classified by contamination severity. Standard-sized fish (n = 20 per species/district) were sampled over six months, and gill, liver, and muscle tissues were analyzed using Graphite furnace atomic absorption spectrophotometry (detection limit: 0.001&#xa0;mg&#xa0;kg⁻<sup>1</sup>; recovery: 95–105%). Liver tissues accumulated the highest As concentrations, followed by gills and muscle. <i>L. rohita</i> exhibited significantly elevated levels compared to <i>C. catla</i> (p &lt; 0.001), due to its benthopelagic feeding behavior. Muscle As exceeded FAO/WHO safety thresholds (0.1&#xa0;mg&#xa0;kg⁻<sup>1</sup>) in all severely affected districts and unexpectedly in East Midnapore, previously classified as unaffected. These findings suggest the need for species-specific consumption advisories and enhanced biomonitoring in As- contaminated freshwater ecosystems.</p>

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Tissue-Specific Arsenic Bioaccumulation in Labeo Rohita and Catla Catla Across Contaminated Districts of West Bengal, India

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Tanmoy Basak,
  • Rupesh Dutta Banik,
  • Debjit De,
  • Priyankar Pal,
  • Pritha Pal

摘要

Arsenic (As) bioaccumulation in freshwater food webs remains poorly understood despite widespread contamination in South Asia's Ganges basin. This study investigated tissue-specific As accumulation in two ecologically distinct cyprinid species, Labeo rohita and Catla catla, across 13 districts in West Bengal classified by contamination severity. Standard-sized fish (n = 20 per species/district) were sampled over six months, and gill, liver, and muscle tissues were analyzed using Graphite furnace atomic absorption spectrophotometry (detection limit: 0.001 mg kg⁻1; recovery: 95–105%). Liver tissues accumulated the highest As concentrations, followed by gills and muscle. L. rohita exhibited significantly elevated levels compared to C. catla (p < 0.001), due to its benthopelagic feeding behavior. Muscle As exceeded FAO/WHO safety thresholds (0.1 mg kg⁻1) in all severely affected districts and unexpectedly in East Midnapore, previously classified as unaffected. These findings suggest the need for species-specific consumption advisories and enhanced biomonitoring in As- contaminated freshwater ecosystems.