Borkhanuddin MH, Goswami U, Cech G, Molnár K, Atkinson SD, Székely C. Description of myxosporeans (Cnidaria: Myxozoa) infecting the popular food fish
Notopterus notopterus (Pisces: Notopteridae) in Malaysia and India.
Food Waterborne Parasitol 2020;
20:e00092. [PMID:
32995584 PMCID:
PMC7508694 DOI:
10.1016/j.fawpar.2020.e00092]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 08/12/2020] [Accepted: 08/19/2020] [Indexed: 11/28/2022] Open
Abstract
This study was a co-operative investigation of myxosporean infections of Notopterus notopterus, the bronze featherback, which is a popular food fish in the South Asian region. We examined fish from Lake Kenyir, Malaysia and the River Ganga, Hastinapur, Uttar Pradesh, India, and observed infections with two myxosporeans: Myxidium cf. notopterum (Myxidiidae) and Henneguya ganapatiae (Myxobolidae), respectively. These species were identified by myxospore morphology, morphometry and host tissue affinity, and the original descriptions supplemented with small-subunit ribosomal DNA sequences and phylogenetic analysis. Free myxospores of M. cf. notopterum were found in the gallbladder, and measured 14.7 ± 0.6 μm long and 6.3 ± 0.6 μm wide; host, tissue and myxospore dimensions overlapped with the type, but differed in morphological details (spore shape, valve cell ridges) and locality (Malaysia versus India). Plasmodia and spores of H. ganapatiae were observed in gills, and myxospores had a spore body 9.7 ± 0.4 μm long, 4.5 ± 0.5 μm wide; sample locality, host, tissue, spore morphology and morphometry matched the original description. Small-subunit ribosomal DNA sequences were deposited in GenBank (M. cf. notopterum MT365527, H. ganapatiae MT365528) and both differed by >7% from congeneric species. Although the pathogenicity and clinical manifestation of myxozoan in humans are poorly understood, consumption of raw fish meat with myxozoan infection was reported to be associated with diarrhea. Identification of current parasite fauna from N. notopterus is an essential first step in assessing pathogen risks to stocks of this important food fish.
Two myxozoan species were identified in the important food fish Notopterus notopterus.
Myxospores of Myxidium cf. notopterum and Henneguya ganapatiae were investigated.
Although rare myxozoan species can be zoonotic M. cf. notopterum and H. ganapatiae are not known to infect humans.
Country-specific myxozoan parasites were found in N. notopterus from India and Malaysia.
DNA sequence data helped to clarify the taxa and improve identification.
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