The first record of \(\textit{Kudoa yasunagai}\) (Hsieh & Chen, 1984) (Myxosporea: Multivalvulida) parasitizing the brain of barhead spinefoot \(\textit{Siganus virgatus}\) (Valenciennes) from Vietnam

Chinh Nguyen Ngoc; Sho Shirakashi

doi:10.15625/2615-9023/19453

Author affiliations

Authors

Nguyen Ngoc Chinh Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi, Vietnam
Sho Shirakashi Aquaculture Research Institute, Kindai University, 3153, Shirahama, Nishimuro, Wakayama 649-2211, Japan

DOI:

https://doi.org/10.15625/2615-9023/19453

Keywords:

Kudoidae, brain, marine fish, SSU rDNA, Khanh Hoa province.

Abstract

A brain-infecting myxozoan, Kudoa yasunagai (Hsieh & Chen, 1984), was identified using both morphological and molecular methods in a marine fish from Van Phong Bay, Khanh Hoa province, Vietnam. Cysts containing spores were observed in the brain of one out of 10 Siganus virgatus (Valenciennes) individuals (10%). The myxospores were radially symmetrical, containing a majority of 7 equal shell valves and polar capsules. The spores measured 6.6 ± 0.1 (6.4‒6.7) µm in length, 7.6 ± 0.5 (7.0‒8.4) µm in width, and 7.0 ± 0.4 (6.5‒7.7) µm in thickness. Polar capsules measured 2.8 ± 0.2 (2.6‒3.0) µm in length and 1.4 ± 0.1 (1.2‒1.5) µm in width, containing a filament inside. The SSU rDNA sequence from the Vietnamese specimen showed > 99.94 % identity with K. yasunagai from Japan and Australia. This report marks a new geographical and host record for K. yasunagai.

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