A new species of the genus Henneguya Thélohan, 1892 (Myxozoa: Myxobolidae) parasitizing the gill lamellae of the giant gourami Osphronemus goramy Lacepède (Anabantiformes: Osphronemidae) from the Mekong River Delta, Vietnam.
| Title: | A new species of the genus Henneguya Thélohan, 1892 (Myxozoa: Myxobolidae) parasitizing the gill lamellae of the giant gourami Osphronemus goramy Lacepède (Anabantiformes: Osphronemidae) from the Mekong River Delta, Vietnam. |
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| Authors: | Hang NTT; College of Aquaculture and Fisheries (CAF), Can Tho University, Cantho 900000, Viet Nam.; Vinh VQ; College of Aquaculture and Fisheries (CAF), Can Tho University, Cantho 900000, Viet Nam.; Dai ND; Institute of Biology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi 10072, Viet Nam.; Quynh NT; Fisheries and Technical Economic College, Bac Ninh, Viet Nam.; Hung NM; Institute of Biology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi 10072, Viet Nam.; Nhung NTH; Hai Duong Medical Technical University, 1 Vu Huu, Le Thanh Nghi, Hai Phong, Viet Nam.; Shirakashi S; Aquaculture Research Institute, Kindai University, 3153 Shirahama, Nishimuro, Wakayama 649-2211, Japan.; Chinh NN; Institute of Biology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi 10072, Viet Nam. Electronic address: chinhnn89@gmail.com. |
| Source: | Parasitology international [Parasitol Int] 2026 Aug; Vol. 113, pp. 103243. Date of Electronic Publication: 2026 Jan 14. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9708549 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-0329 (Electronic) Linking ISSN: 13835769 NLM ISO Abbreviation: Parasitol Int Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Amsterdam ; New York : Elsevier, c1997- |
| MeSH Terms: | Gills*/parasitology ; Fish Diseases*/parasitology ; Fish Diseases*/epidemiology ; Myxozoa*/classification ; Myxozoa*/genetics ; Myxozoa*/isolation & purification ; Myxozoa*/ultrastructure ; Parasitic Diseases, Animal*/parasitology ; Parasitic Diseases, Animal*/epidemiology ; Perciformes*/parasitology; Vietnam/epidemiology ; RNA, Ribosomal, 18S/genetics ; Animals ; Phylogeny ; Rivers |
| Abstract: | During a survey of myxosporean parasites infecting freshwater fishes in the Mekong River Delta, Vietnam, myxospores of the genus Henneguya were discovered in the gills of the giant gourami Osphronemus goramy Lacepède (Anabantiformes: Osphronemidae). White, spherical plasmodia were found within the gill lamellae of 10 out of 25 examined fish (40% prevalence) and measured 650-950 μm in diameter. Mature myxospores are elongate with two equal caudal appendages, and measure 68.5 ± 3.4 (64.8-79.4) μm in total length. The spore body measures 16.3 ± 0.9 (15.0-18.1) μm in length, 5.6 ± 0.3 (5.1-6.0) μm in width, and 4.8 ± 0.2 (4.5-5.0) μm in thickness. Each caudal appendage is 51.6 ± 3.3 (46.5-58.9) μm in length. The spore wall is smooth, and two equal ovoid nematocysts, each 6.1 ± 0.3 (5.6-6.6) μm long and 1.6 ± 0.2 (1.3-1.8) μm wide, are located anteriorly. Histological sections revealed no inflammatory response but showed local deformation of the gill lamellae at infection sites. Phylogenetic analysis of the SSU rDNA sequences placed this species in a distinct clade closely related to Myxobolus neurophilus, Myxobolus pharyngeus, and Henneguya voronini. Based on morphological and molecular evidence, the parasite is described herein as a new species, Henneguya luci n. sp.; (Copyright © 2026 Elsevier B.V. All rights reserved.) |
| Competing Interests: | Declaration of competing interest Animal handling and use: All fish used in this study were collected by net from a fish seed production and supply facility in Vinh Long Province, Vietnam. The authors declare no competing interests. |
| Contributed Indexing: | Keywords: Aquaculture; Freshwater fish; Gill; Henneguya; Parasite; Plasmodia |
| Substance Nomenclature: | 0 (RNA, Ribosomal, 18S) |
| Entry Date(s): | Date Created: 20260116 Date Completed: 20260311 Latest Revision: 20260311 |
| Update Code: | 20260311 |
| DOI: | 10.1016/j.parint.2026.103243 |
| PMID: | 41544932 |
| Database: | MEDLINE |
Journal Article