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<p>This study is aimed to investigate the prevalence, morphology, histology, and ultrastructure of certain parasites on the gills and skin of fish species from the River Jhelum, Kashmir, India. Parasites identified, including <i>Piscicola geometra, Neascus vetestai, and Ichthyophthirius multifiliis,</i> were recovered from <i>Schizothorax</i> species, and <i>Lernaea cyprinacea</i> were found on carps. Of these, the digenean larvae showed manifestations of disease due to host cysts that produced black pigmentation on tissues external to the skin, such as the gills, etc., though the trematode larvae (metacercariae) themselves remained endoparasitic (Kaw). Among the parasites, <i>N. vetestai</i> (43.10%) showed the highest prevalence, while <i>I. multifiliis</i> (1.03%) had the lowest prevalence. The highest parasitic prevalence was recorded at Chattabal (site II), followed by Sopore (site III) and Guree (site I). Histopathological examination of the infested gill and skin tissues revealed significant alterations. The gills exhibited severe changes including aneurism in the secondary lamellae, reduction in interlamellar spaces and hyperplasia of the secondary lamella. In the skin, the presence of parasites induced inflammatory reactions at the attachment sites, leading to epidermal destruction and epithelial sloughing. Scanning electron microscopy provided detailed images of the <i>P. geometra</i> and the tissues damaged due to parasites at various magnifications. The findings indicated localized cellular damage caused by parasitic attachment, accompanied by phagocytic cell infiltration and moderate granulomatous reactions. The observed ultrastructural and histopathological changes in the gills and skin of fish due to parasites infection can serve as indicators of infection severity. This information is crucial for implementing effective fish management strategies to ensure production of healthy fish for human consumption.</p>

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Parasitic threats: assessing the burden on local and exotic fishes in River Jhelum

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Ishrat Shafi,
  • Asifa Wali,
  • Feroz A. Shah,
  • Gowhar Iqbal,
  • Lukram Sushil Singh,
  • Shabir Ahmad Dar,
  • Nazir Ah Sofi

摘要

This study is aimed to investigate the prevalence, morphology, histology, and ultrastructure of certain parasites on the gills and skin of fish species from the River Jhelum, Kashmir, India. Parasites identified, including Piscicola geometra, Neascus vetestai, and Ichthyophthirius multifiliis, were recovered from Schizothorax species, and Lernaea cyprinacea were found on carps. Of these, the digenean larvae showed manifestations of disease due to host cysts that produced black pigmentation on tissues external to the skin, such as the gills, etc., though the trematode larvae (metacercariae) themselves remained endoparasitic (Kaw). Among the parasites, N. vetestai (43.10%) showed the highest prevalence, while I. multifiliis (1.03%) had the lowest prevalence. The highest parasitic prevalence was recorded at Chattabal (site II), followed by Sopore (site III) and Guree (site I). Histopathological examination of the infested gill and skin tissues revealed significant alterations. The gills exhibited severe changes including aneurism in the secondary lamellae, reduction in interlamellar spaces and hyperplasia of the secondary lamella. In the skin, the presence of parasites induced inflammatory reactions at the attachment sites, leading to epidermal destruction and epithelial sloughing. Scanning electron microscopy provided detailed images of the P. geometra and the tissues damaged due to parasites at various magnifications. The findings indicated localized cellular damage caused by parasitic attachment, accompanied by phagocytic cell infiltration and moderate granulomatous reactions. The observed ultrastructural and histopathological changes in the gills and skin of fish due to parasites infection can serve as indicators of infection severity. This information is crucial for implementing effective fish management strategies to ensure production of healthy fish for human consumption.