Hepatic microsporidiosis of mudskipper, Boleophthalmus dussumieri Valenciennes, 1837 (Perciformes: Gobiidae), due to Microgemma sp.

Vandana, V R and Poojary, Nalini and Tripathi, Gayatri and Pavan Kumar, Annam and Sanil, N K and Rajendran, K V (2021) Hepatic microsporidiosis of mudskipper, Boleophthalmus dussumieri Valenciennes, 1837 (Perciformes: Gobiidae), due to Microgemma sp. Journal of Parasitic Diseases. pp. 1-8.

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The present study reports a case of hepatic microsporidiosis caused by Microgemma sp. in brackishwater fish, Boleophthalmus dussumieri (Valenciennes, 1837) (n = 60), from the west coast of India. An eight-month study from September 2017 to April 2018 revealed a prevalence of 11.7% for this parasite. The microsporidian showed tissuespecific infection and did not reveal any gross pathology in infected fish. Small whitish cysts containing microspores of size 0.3–0.5 mm were observed in the liver of fish. The range of pyriform microsporidian spore size varied from 2.9–3.77 9 1.85–2.67 lm. Scanning electron microscopy of the spores showed a distinct groove on the anterior end of the spore for polar tube extrusion. Polymerase chain reaction (PCR) amplification of the DNA extracted from the microsporidian-infected liver tissue using primers targeting small ribosomal subunit DNA (SSU rDNA) yielded * 1340 bp amplicon and the genetic distance analysis showed a 0.2% variation with the reported M. tilanpasiri. Accordingly, in the phylogenetic tree, the present species of Microgemma clustered with M. tilanpasiri. Even though, the morphomeristic characters of the present Microgemma sp. was marginally different from the reported M. tilanpsasiri; the SSU rDNA showed considerably higher similarity with M. tilanpasiri. Thus, we report the species of Microgemma as Microgemma aff. tilanpasiri from a new host. This is the first report of a microsporidian from B. dussumieri and the first record of the genus Microgemma from India

Item Type: Article
Uncontrolled Keywords: Microsporidia; Microgemma; Parasite; Fish; Mudskipper; Boleophthalmus
Subjects: Fish and Fisheries > Fish Disease
Fish and Fisheries > Fish biology
Divisions: CMFRI-Kochi > Marine Biotechnology
Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology
CMFRI-Kochi > Marine Biotechnology
Subject Area > CMFRI-Kochi > Marine Biotechnology
Depositing User: Arun Surendran
Date Deposited: 26 Oct 2021 10:33
Last Modified: 25 Jan 2023 06:25
URI: http://eprints.cmfri.org.in/id/eprint/15434

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