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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03569

    Outbreak of hirduniasis in aquarium reared albino pacu fish Piaractus brachypomus

    J. Praveenraj*, A. Uma, K. Saravanan, G. Rebecca, C. K. Mandal

    *Corresponding author:

    ABSTRACT: This communication reports hirudiniasis caused by Hemiclepsis marginata asiatica Moore, 1927 in Albino Pacu fish Piaractus brachypomus (Cuvier, 1818), constituting the first documentation from India. The outbreak occurred in a retailer’s aquarium tank; infested fishes appeared asphyxiated, unable to swim or swimming upside down, with cloudy eyes and body with thick mucus secretion. The prevalence and mortality was 100% with a mean intensity of 81 leeches per fish. The histopathology of the morbid fish revealed degenerative necrosis, eosinophilic infiltration in the muscle tissue and haemorrhages in the fin membrane. The mitochondrial 18S rDNA and 12S rDNA genes were characterised and submitted to GenBank under the accession numbers MN380443 (18S) and MK733282 (12S). A maximum likelihood tree was constructed using 12S rDNA gene sequences to demonstrate the phylogenetic position of Hemiclepsis marginata asiatica among its congeners.