Pardede, Maria Agustina, Ambarwati, Dewi, Agesti, Elmira Kurnia, Sari, Putri Puspita, Aufa, In’amul, Aziz, Muhammad Abdul, Rahma, Nesya Sahada, Anggreani, Shovia Finny, Ulkhaq, Mohammad Faizal, Wardhana, April Hari, Termizi, Farah Haziqah Meor, and Loh, Jiun- Yan (2025) Dimension, Prevalence, Intensity and Histopathology of Octolasmis sp. on Blue Swimming Crab from Bulusan Beach, Banyuwangi Regency, Indonesia. Egyptian Journal of Aquatic Biology and Fisheries, 29 (6). pp. 1317-1331.

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Abstract

The blue swimming crab Portunus pelagicus is an economically important species in tropical waters, particularly in Indonesia. This study aimed to investigate the prevalence, intensity, and pathological effects of the ectoparasite Octolasmis angulata on P. pelagicus at Bulusan Beach, East Java, during October to November 2024. Morphological identification and histopathological analyses of 12 specimens revealed that O. angulata attachment caused severe respiratory impairments, as evidenced by disrupted gill lamellae and hemocytic responses. A strong positive correlation was observed between crab size and infestation level, suggesting that larger crabs were more susceptible to heavier O. angulata colonization. Infestation analysis showed that O. angulata exhibited a marked preference for the gills, with 2,081 individuals recorded, compared to 205 on the carapace and 43 on the pereiopods. Histopathological examination of the gills revealed extensive structural damage, including lamellar fusion, vacuolization, and hemocyte aggregation, emphasizing the detrimental effects of O. angulata on host respiratory function. These findings provide new insights into the infestation dynamics and pathological implications of O. angulata in P. pelagicus, contributing to a better understanding of host–epibiont interactions in tropical marine ecosystems.

Item ID:	89827
Item Type:	Article (Research - C1)
ISSN:	1110-6131
Keywords:	Blue swimming crab, Portunus pelagicus, Octolasmis angulate, Sustainable Fisheries, Ectoparasites
Copyright Information:	© Egyptian Society for the Development of Fisheries and Human Health. EJABF is an Open Access journal. Users have the right to read, download, copy, distribute, print, search, or link to the full texts of articles under the following conditions: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). https://ejabf.journals.ekb.eg/journal/about
Date Deposited:	10 Apr 2026 01:36
FoR Codes:	30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300501 Aquaculture @ 100%
SEO Codes:	10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1099 Other animal production and animal primary products > 109902 Animal welfare @ 100%
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