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<p>The present study provides a comprehensive assessment of helminth parasites and seasonal infections in freshwater food fishes across six districts of West Bengal, India. During the year 2024, a total of 739 fish specimens representing 48 species were collected during pre- and post-monsoon seasons. Overall prevalence of helminth infection rose significantly from 9.07% in pre-monsoon to 21.81% post-monsoon, with trematodes emerging as the most dominant group, followed by nematodes, cestodes, and acanthocephalans. The parasitic infections in freshwater fishes recorded during the present study comprised 11 families of trematodes, 3 families of cestodes, 2 of acanthocephalan and 4 families of nematodes. <i>Channa gachua</i> (Hamilton, 1822) was the only species infected by all the four parasite groups, while several hosts showed group-specific infections, highlighting varying degrees of host specificity and ecological overlap. District-level comparisons showed clear spatial variation in helminth infection, with higher prevalence in reservoir-dominated habitats of Paschim Bardhaman and Purulia and minimal infections in rain-fed ponds and streams of Bankura. These differences may reflect contrasting habitat conditions, nutrient levels, and intermediate-host availability influencing parasite transmission. These findings align with previous regional studies and emphasize the need for seasonal surveillance, habitat-based risk mapping, and improved fish health management to mitigate the ecological and economic impacts of helminthiasis in fishes of West Bengal.</p>

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Prevalence and host-parasitic interactions of helminths and freshwater fishes in selected districts of West Bengal, India

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Suman Das,
  • Anindita Ghosh,
  • Pavel Dutta,
  • Rasmanjani Ali,
  • Laishram Kosygin,
  • Anjum N. Rizvi

摘要

The present study provides a comprehensive assessment of helminth parasites and seasonal infections in freshwater food fishes across six districts of West Bengal, India. During the year 2024, a total of 739 fish specimens representing 48 species were collected during pre- and post-monsoon seasons. Overall prevalence of helminth infection rose significantly from 9.07% in pre-monsoon to 21.81% post-monsoon, with trematodes emerging as the most dominant group, followed by nematodes, cestodes, and acanthocephalans. The parasitic infections in freshwater fishes recorded during the present study comprised 11 families of trematodes, 3 families of cestodes, 2 of acanthocephalan and 4 families of nematodes. Channa gachua (Hamilton, 1822) was the only species infected by all the four parasite groups, while several hosts showed group-specific infections, highlighting varying degrees of host specificity and ecological overlap. District-level comparisons showed clear spatial variation in helminth infection, with higher prevalence in reservoir-dominated habitats of Paschim Bardhaman and Purulia and minimal infections in rain-fed ponds and streams of Bankura. These differences may reflect contrasting habitat conditions, nutrient levels, and intermediate-host availability influencing parasite transmission. These findings align with previous regional studies and emphasize the need for seasonal surveillance, habitat-based risk mapping, and improved fish health management to mitigate the ecological and economic impacts of helminthiasis in fishes of West Bengal.