Abstract
During a survey of myxosporean parasites of freshwater fishes in northern Vietnam, myxospores resembling those of the genus Myxobolus (Myxosporea: Myxobolidae) were found in the trunk muscle of 6 out of 35 specimens (17.14%) of wild goldfish Carassius auratus (Cypriniformes: Cyprinidae). The mature spores were 12.0 ± 0.4 (11.4 − 12.6) µm long, 8.5 ± 0.2 (7.9 − 9.0) µm wide and 6.1 ± 0.2 (5.8 − 6.3) µm thick, containing two pyriform-shaped polar capsules unequal in size. The larger polar capsule was 7.6 ± 0.3 (7.1 − 8.4) µm long and 3.5 ± 0.1 (3.3 − 3.8) µm wide, and the smaller polar capsule was 6.2 ± 0.3 (5.5 − 6.7) µm long and 2.9 ± 0.2 (2.6 − 3.4) µm wide. Each polar capsule contained a polar filament with 3–5 coils. A phylogenetic analysis based on the small subunit rDNA (SSU rDNA) sequence revealed that this Myxobolus species forms a distinct branch in the phylogenetic tree sister to Myxobolus artus and Myxobolus cyprini, with DNA sequence similarity at 97.6% to M. artus and 97.5% to M. cyprini. A combination of the morphological characteristics and molecular data suggest that this is an undescribed species, and we propose the name Myxobolus hoabinhensis n. sp.
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Data availability
DNA sequence data was deposited in GenBank, and the archival tissue was submitted to the Institute of Ecological and Biological Resources, Vietnam Academy of Science and Technology.
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Funding
This study is partly supported by the JSPS RONPAKU program (R12206) to NNC and SS, and the project of the Institute of Ecology and Biological Resources under code number IEBR ĐT.08–22. One of the authors, Yurakhno Violetta, received financial support from Russian Academy of Sciences of the Russian Federation budget theme under code number 121030100028–0.
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All the fish used in this study were purchased from fish markets. No live animals were used.
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Chinh, N.N., Tham, N.T., Yurakhno, V.M. et al. Description of Myxobolus hoabinhensis n. sp. (Myxosporea: Myxobolidae), infecting the trunk muscles of goldfish Carassius auratus (Linnaeus, 1758) (Cypriniformes: Cyprinidae) in northern Vietnam. Parasitol Res 121, 2495–2502 (2022). https://doi.org/10.1007/s00436-022-07586-5
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DOI: https://doi.org/10.1007/s00436-022-07586-5