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Evidence of multiple species of Chilodonella (Protozoa, Ciliophora) infecting Australian farmed freshwater fishes

journal contribution
posted on 2019-12-16, 00:00 authored by G Bastos Gomes, TL Miller, David VaughanDavid Vaughan, DR Jerry, C McCowan, TL Bradley, KS Hutson
Parasitic Chilodonella species, Chilodonella piscicola and Chilodonella hexasticha, cause considerable economic losses globally to freshwater farmed fish production. Some genetic studies of Chilodonella spp. have indicated that many species within the genus may form cryptic species complexes. To understand the diversity of Chilodonella spp. infecting Australian freshwater farmed fish, specimens were isolated from infected barramundi (Lates calcarifer) and Murray cod (Maccullochella peelii) from fish farms in tropical north Queensland (QLD), temperate Victoria (Vic) and New South Wales (NSW) for genetic and morphological analysis. Parasites were stained and measured for morphological description and comparative phylogenetic analyses were performed using the mitochondrial small subunit (mtSSU) rDNA marker. Morphological analyses revealed four distinct morphotypes of Chilodonella infecting farmed barramundi and Murray Cod. Three putative species were isolated from barramundi (Chilodonella hexasticha, C. acuta and C. uncinata) and one from Murray cod (C. piscicola). However, phylogenetic analyses detected only three distinct genotypes, with the putative C. hexasticha and C. piscicola sharing 100% sequence identity. This suggests that Australian isolates of C. hexasticha and C. piscicola could represent the same species and may exhibit phenotypic plasticity. Further molecular analysis, including isolates from the type localities, should be performed to support or refute the synonymy of these species.

Funding

Other

History

Volume

237

Start Page

8

End Page

16

Number of Pages

9

ISSN

0304-4017

Publisher

Elsevier, Netherlands

Language

en

Peer Reviewed

  • Yes

Open Access

  • No

Acceptance Date

2017-03-03

External Author Affiliations

James Cook University; Department of Economic Development, Jobs, Transport and Resources,Vic.; Department of Fisheries Western Australia

Era Eligible

  • Yes

Journal

Veterinary Parasitology

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