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<p>A total of 15 species of parasitic isopods, belonging to six genera, were identified from the examined marine fishes. The species and their respective hosts included: <i>Cymothoa eremita</i> from <i>Parastromateus niger</i>; <i>C. indica</i> from <i>Ambassis ambassis</i> ; <i>Joryma brachysoma</i> from <i>Ilisha melastoma</i>; <i>J. hilsae</i> from <i>Pellona ditchela</i>; <i>Mothocya plagulophora</i> from <i>Hemiramphus far</i>; <i>M. renardi</i> from <i>Strongylura leiura</i>; <i>M. collettei</i> and <i>M. karobran</i> from <i>Tylosurus crocodilus</i>; <i>Nerocila phaiopleura</i> from <i>Sardinella longiceps</i>, <i>Chirocentrus nudus</i> and <i>Rastrelliger kanagurta</i>; <i>N. sundaica</i> from <i>Sardinella fimbriata</i>; <i>N. sigani</i> from <i>Siganus canaliculatus</i> ; <i>N. loveni</i> from <i>Opisthopterus tardoore</i>; <i>Norileca indica</i> from <i>Selar crumenophthalmus</i>; <i>N. triangulata</i> from <i>R. kanagurta</i>; and <i>Ryukyua circularis</i> from <i>Amblygaster sirm</i>. The analysis revealed that although most parasitic isopods are not strictly host-specific, they display a distinct site specificity. Infestations were localized to the gill chamber, buccal cavity, or body surface, depending on the parasite species. The pathological effects also varied according to the site of attachment: parasites on the body surface induced more severe external lesions, those in the gill chamber caused moderate damage affecting respiration, while infestations in the buccal cavity generally resulted in comparatively mild impacts.</p>

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Diversity and host associations of parasitic isopods (Isopoda: Cymothoidae) from marine fishes of parangipettai and Nagapattinam, Southeast Coast of India

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Vijayapoopathi Singaravel

摘要

A total of 15 species of parasitic isopods, belonging to six genera, were identified from the examined marine fishes. The species and their respective hosts included: Cymothoa eremita from Parastromateus niger; C. indica from Ambassis ambassis ; Joryma brachysoma from Ilisha melastoma; J. hilsae from Pellona ditchela; Mothocya plagulophora from Hemiramphus far; M. renardi from Strongylura leiura; M. collettei and M. karobran from Tylosurus crocodilus; Nerocila phaiopleura from Sardinella longiceps, Chirocentrus nudus and Rastrelliger kanagurta; N. sundaica from Sardinella fimbriata; N. sigani from Siganus canaliculatus ; N. loveni from Opisthopterus tardoore; Norileca indica from Selar crumenophthalmus; N. triangulata from R. kanagurta; and Ryukyua circularis from Amblygaster sirm. The analysis revealed that although most parasitic isopods are not strictly host-specific, they display a distinct site specificity. Infestations were localized to the gill chamber, buccal cavity, or body surface, depending on the parasite species. The pathological effects also varied according to the site of attachment: parasites on the body surface induced more severe external lesions, those in the gill chamber caused moderate damage affecting respiration, while infestations in the buccal cavity generally resulted in comparatively mild impacts.