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

Gomes, Giana Bastos; Miller, Terrence L.; Vaughan, David B.; Jerry, Dean R.; McCowan, Christina; Bradley, Tracey; Hutson, Kate S.

doi:10.1016/j.vetpar.2017.03.004

Cited by 19 publications

(10 citation statements)

References 37 publications

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“…Chilodonella hexasticha and Chilodonella piscicola are common ectoparasites on freshwater fish, and the most substantial difference between them is the number of somatic kineties (14–17 vs. 15–29) (Bastos Gomes, Jerry, et al, ; Bastos Gomes, Miller, et al, ; Deng et al, ). Although the body size of the population in the present study is smaller than that of C. hexasticha described by Hu (), the morphometric and morphological data correspond well to the population described by Bastos Gomes, Miller, et al (). Thus, the present population is considered to be conspecific with C. hexasticha .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Chilodonella species have attracted increasing attention because of their pathogenicity in cultured fishes (Bastos Gomes, Hutson, et al, ; Bastos Gomes, Jerry, et al, ; Bastos Gomes, Miller, et al, ; Padua et al, ; Valladão, Pereira, Gallani, & Pilarski, ). Most species of Chilodonella are free living; only two species, namely, C. hexasticha and C. piscicola , are regarded as parasitic species (Deng et al, ; Qu et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Most species of Chilodonella are free living; only two species, namely, C. hexasticha and C. piscicola , are regarded as parasitic species (Deng et al, ; Qu et al, ). Some species, for example, Chilodonella acuta and C. uncinata , can become opportunistic pathogens of aquatic organisms in certain environments (Bastos Gomes, Miller, et al, ; Das, ). Das () proposed that C. uncinata could cause mass mortality of northern house mosquito Culex pipiens, a finding with obvious insect vector control implications.…”

Section: Discussionmentioning

confidence: 99%

“…The majority of species from this group are free‐living forms and only a few species are found as ectoparasitic ciliates on wild and cultured freshwater fish (Bastos Gomes, Hutson, et al, ; Bastos Gomes, Jerry, et al, ; Deng et al, ; Qu et al, ). In the last decade, species of both genera have been isolated from various aquatic hosts worldwide, but the majority of studies have focused on cyprinid fishes Hu, ; Mitra, Bandyopadhyay, & Gong, ; Bastos Gomes, Hutson, et al, ; Bastos Gomes, Miller, et al, ). Thus, there is scarce information available regarding other important hosts for these parasites.…”

Section: Introductionmentioning

confidence: 99%

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First diagnosis of ectoparasitic ciliates (TrichodinaandChilodonella) on farmed juvenile yellow catfish,Tachysurus fulvidracoin China

et al. 2019

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Diseases caused by ectoparasitic ciliates can be a threat to yellow catfish, Tachysurus fulvidraco, an economically important fish in China. However, limited data are available regarding ectoparasitic ciliates from T. fulvidraco. In June 2015, a mass mortality event which may have been caused by ectoparasitic ciliates occurred in a population of juvenile T. fulvidraco cultured in Chidong Lake. Air‐dried smears isolated from the body surface of fish were impregnated with silver nitrate for morphological identification. In total, six known ciliate species, including four species belonging to the genus Trichodina (Trichodina acuta, Trichodina maritinkae, Trichodina nobilis, and Trichodina heterodentata) and two chilodonellids, namely, Chilodonella uncinata and Chilodonella hexasticha, and unidentified sessilids were found. Morphological descriptions of the known trichodinids and chilodonellids are provided based on silver nitrate‐impregnated specimens. Histopathological analysis revealed that trichodinids and chilodonellids could adhere to the epithelium firmly by adhesive discs and the ventral bodies, respectively, resulting in massive mucus production and epithelial hyperplasia and desquamation. This study confirmed that T. fulvidraco is a previously unrecognized host for T. acuta, T. heterodentata, T. nobilis and C. hexasticha. Although C. uncinata was also present in this study, histopathological analysis suggests that C. uncinata may be a commensal and not a true pathogen in T. fulvidraco. To our knowledge, this work is the first investigation regarding ectoparasitic ciliates on cultured T. fulvidraco in China.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First diagnosis of ectoparasitic ciliates (TrichodinaandChilodonella) on farmed juvenile yellow catfish,Tachysurus fulvidracoin China

et al. 2019

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“…Microorganisms of the genus Chilodonella are free‐living protozoa in aquatic environments, with two species, that is Chilodonella hexasticha and C. piscicola , already well known to cause disease in fish globally, leading to economic losses (Bastos Gomes et al, ). In a recent review by Bastos Gomes, Jerry, Miller, and Hutson (), the authors showed that Chilodonella spp.…”

Section: Measurements (μM) Of Chilodonella Hexasticha Found On Yellowmentioning

confidence: 99%

A massive Chilodonella hexasticha infestation associated with yellowtail tetra Astyanax lacustris mortality in aquaculture: Identification and pathology

et al. 2019

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First record of two ectoparasitic ciliates of the genus Trichodina (Ciliophora: Trichodinidae) parasitizing gills of an invasive freshwater fish, Micropercops swinhonis, in Tibet

et al. 2018

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Although high diversity of parasitic ciliates has been reported in China, little is known about the species from high altitude areas, especially in Tibet. To investigate the species of parasitic ciliates in Tibet, a project was initiated in the Chabalang wetland in 2013. Two Trichodina species, namely, Trichodina sp. and T. reticulata Hirschmann & Partsch, 1955, were isolated from gills of an invasive fish, Micropercops swinhonis for the first time. In the present study, we provided the morphological, morphometrical, and molecular characterizations of the two species and conducted the phylogenetic analyses of mobilids based on the small subunit ribosomal RNA gene (SSU rDNA) sequences. Both morphological characters and morphometric data of the T. reticulata agreed well with previous studies. Although two partial SSU rDNA sequences were obtained in the present study, only the sequence of T. reticulata population in the present study was thought to be reliable. The other sequence may not belong to the other species. Thus, we regarded the other species isolated in the present study as Trichodina sp. to avoid the wrong or confused species identification. Morphologically, Trichodina sp. is distinguished mainly by its large body shape with a broad adhesive disk, robust and obliquely quadrilateral blades, and well-developed rays. T. reticulata is mainly characterized with the 8-12 spherical or elliptical granules in the central zone of adhesive disk. Phylogenetic analyses consistently showed the two ectoparasites clustered with freshwater species of the genus Trichodina within the order Mobilida. Our study extended the host range of T. reticulata and supplemented the molecular data. Also, results reveal that invasion of exotic fish may cause a potential threat to native fish by introducing or dispersing parasitic ciliates.

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

Cited by 19 publications

References 37 publications

First diagnosis of ectoparasitic ciliates (TrichodinaandChilodonella) on farmed juvenile yellow catfish,Tachysurus fulvidracoin China

First diagnosis of ectoparasitic ciliates (TrichodinaandChilodonella) on farmed juvenile yellow catfish,Tachysurus fulvidracoin China

A massive Chilodonella hexasticha infestation associated with yellowtail tetra Astyanax lacustris mortality in aquaculture: Identification and pathology

First record of two ectoparasitic ciliates of the genus Trichodina (Ciliophora: Trichodinidae) parasitizing gills of an invasive freshwater fish, Micropercops swinhonis, in Tibet

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