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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03534

    Morphological, histological, and molecular aspects of Myxobolus zaikae n. sp., a parasite of the roach Rutilus rutilus in Lake Baikal

    Marina D. Batueva*

    *Corresponding author:

    ABSTRACT: A new myxobolid species, Myxobolus zaikae n. sp., was found in the connective tissue near kideney and liver blood vessels of the common roach, Rutilus rutilus, while investigating fish myxosporean fauna of Lake Baikal. The parasites were studied on the basis of spore morphology as well as with histological and molecular methods. Mature spores of M. zaikae n. sp. are round or ellipsoidal in frontal view and lemon-shaped in lateral view, measuring 11.37 ± 0 .11 µm (10.2–14.0 µm) long, 10.29 ± 0.10 µm (9.6–11.0 µm) wide, and 6.3 ± 0.08 µm (5.8–7.1 µm) thick (mean ± SD; n=50). Polar capsules are equal and pyriform, measuring 4.5 ± 0.07 µm (3.4–5.2 µm) long by 2.9 ± 0.03 µm (2.6–3.3 µm) wide. Polar capsules contained polar filaments coiled with 5 to 6 turns. Phylogenetic analysis showed that this newly described species cluster with other myxobolid species infecting connective tissue of different organs from Palearctic cyprinid fish.