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Diseases of Aquatic Organisms

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DAO 141:39-46 (2020)  -  DOI: https://doi.org/10.3354/dao03514

Morphological, histological and molecular characterization of Myxidium cf. rhodei infecting the kidney of Rutilus rutilus

Marina Dashi-Dorjievna Batueva1,#, Xiaoyi Pan2,#, Jinyong Zhang3,4, Xinhua Liu3, Wu Wei3, Yang Liu3,4,*

1Institute of General and Experimental Biology of the Siberian Branch of the Russian Academy of Sciences, 670047 Ulan-Ude, Russia
2Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs; Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, 313001 Huzhou, PR China
3Key Laboratory of Aquaculture Diseases Control, Ministry of Agriculture and Rural Affairs; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072 Wuhan, PR China
4School of Marine Science and Engineering, Qingdao Agricultural University, 266109 Qingdao, PR China
*Corresponding author:
#These authors contributed equally to this work

ABSTRACT: In the present study, we provide supplementary data for Myxidium cf. rhodei Léger, 1905 based on morphological, histological and molecular characterization. M. cf. rhodei was observed in the kidneys of 918 out of 942 (97%) roach Rutilus rutilus (Linnaeus, 1758). Myxospores of M. cf. rhodei were fusiform with pointed ends, measuring 12.7 ± 0.1 SD (11.8-13.4) µm in length and 4.6 ± 0.1 (3.8-5.4) µm in width. Two similar pear-shaped polar capsules were positioned at either ends of the longitudinal axis of the myxospore: each of these capsules measured 4.0 ± 0.1 (3.1-4.7) µm in length and 2.8 ± 0.1 (2.0-4.0) µm in width. Polar filaments were coiled into 4 to 5 turns. Approximately 18-20 longitudinal straight ridges were observed on the myxospore surface. The suture line was straight and distinctive, running near the middle of the valves. Histologically, the plasmodia of the present species were found in the Bowman’s capsules, and rarely in the interstitium of the host. Phylogenetic analysis revealed that M. cf. rhodei was sister to M. anatidum in the Myxidium clade including most Myxidium species from freshwater hosts.


KEY WORDS: Myxidium cf. rhodei · Rutilus rutilus · Myxosporea · Kidney · SSU rDNA


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Cite this article as: Batueva MDD, Pan X, Zhang J, Liu X, Wei W, Liu Y (2020) Morphological, histological and molecular characterization of Myxidium cf. rhodei infecting the kidney of Rutilus rutilus. Dis Aquat Org 141:39-46. https://doi.org/10.3354/dao03514

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