Epizootic ulcerative syndrome (EUS) in fish: history and current status of understanding

Kamilya, Dibyendu; Baruah, Arunjyoti

doi:10.1007/s11160-013-9335-5

Cited by 27 publications

(28 citation statements)

References 43 publications

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“…((Vijayakumar et al, 2013). A number of etiologies have been proposed for the outbreak of EUS in which the primary agent is thought to be viruses, bacteria, parasites and fungi (Kamilya and Baruah, 2014). An unusual ulcerative condition in wild fish was reported for the first time in Africa (Huchzermeyer and van der Waal, 2012).…”

Section: Discussionmentioning

confidence: 99%

Isolation of Aphanomyces invadans Associated with Skin Lesions in African Catfish" Clarias gariepinus"

Youssuf

Gwad

Asely

et al. 2017

Benha Veterinary Medical Journal

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The present study aimed to isolate and identify of Aphanomyces invadans from naturally infected African Catfish" Clarias gariepinus". A total number of 105 cultured Clarias gariepinus collected from private fish farms in Kafr Al-Sheikh & Behera Governorates. Result revealed that the prevalence of infection among the examined fish was 8.6 % and the disease mostly recorded during winter and spring. The infected fish developed characteristic ulcerative lesions and fin rot. Fungus-like oomycetes Aphanomyces invadans grow on glucose peptone yeast (GPY) agar as opaque colonies with uneven white transparent velvets surface at room temperature. Microscopically, lactophenol cotton blue stained fungal growth appeared as non-septated thin long branched hyphae with tapered end containing cytoplasmic organelles. On sporulating media, the rectangular shaped spores appeared inside the hyphae connected together by thin filament. In conclusions, EUS is an invasive disease of Clarias gariepinus and care should be taken with low temperature in managing fish pond.

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Section: Discussionmentioning

confidence: 99%

Isolation of Aphanomyces invadans Associated with Skin Lesions in African Catfish" Clarias gariepinus"

Youssuf

Gwad

Asely

et al. 2017

Benha Veterinary Medical Journal

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“…More than 100 fish species have been reported to be affected by EUS18. The disease was first detected in Japan19, but has been subsequently reported from continental Asia, Australia, North America and Africa, with different names being given20.…”

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confidence: 99%

Mitochondrial genomes and comparative genomics of Aphanomyces astaci and Aphanomyces invadans

Makkonen

Vesterbacka

Martin

et al. 2016

Sci Rep

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The genus Aphanomyces (Saprolegniales, Oomycetes) includes species with a variety of ecologies from saprotrophs to plant and animal parasites. Two important species in this genus are A. astaci, the cause of crayfish plague and its close relative, A. invadans, which causes the epizootic ulcerative syndrome on fish. In this study, we have assembled and annotated the mitochondrial (mt) genomes of A. astaci and A. invadans from the whole genome shotgun sequence reads (PRJNA187372; PRJNA258292, respectively). The assembly was generated from A. astaci Pc-genotype strain APO3 and A. invadans strain NJM9701. The sizes of the mtDNAs were 49,489 bp and 49,061 bp for A. astaci and A. invadans, respectively. The species shared similar genetic content and organization encoding 35 proteins, two ribosomal RNAs, three putative open reading frames and 33 transfer RNAs of 19 amino acids for peptide synthesis. Both species also had a large inverted repeat region (LIR) of approximately 12 kb, the LIR contained large and small ribosomal RNAs and eight protein coding genes. These annotated mt genomes serve as a valuable genetic backbone for further development of diagnostic methods and phylogenetic and migration studies of the animal parasitic species of Aphanomyces.

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“…Epizootic ulcerative syndrome (EUS) is a severely infectious disease of fish that is known to affect more than 100 types of cultured and wild fishes, and has caused serious losses in the aquaculture industry (Lilley, Phillips & Tonguthai, 1992;Kamilya & Baruah, 2014;Gomo et al, 2016;Iberahim, Trusch & West, 2018). The Organization International Des Epizooties (OIE) has confirmed that EUS is a seasonal epidemic caused by infection of the oomycete Aphanomyces invadans or A. piscicida, and is listed among those diseases that must be notified (OIE, 2013;Iberahim, Trusch & West, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The Organization International Des Epizooties (OIE) has confirmed that EUS is a seasonal epidemic caused by infection of the oomycete Aphanomyces invadans or A. piscicida, and is listed among those diseases that must be notified (OIE, 2013;Iberahim, Trusch & West, 2018). Aphanomyces infection of fish occurs via water-borne secondary spores or planospores that adhere to the surface of impaired fish skin, a prerequisite for spore infection (Lilley et al, 1998;Oidtmann, 2012;Kamilya & Baruah, 2014), and subsequently develop into mycelium (OIE, 2013).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #2 of "Epizootic ulcerative syndrome causes cutaneous dysbacteriosis in hybrid snakehead (Channa maculata♀ × Channa argus♂) (v0.1)"

2019

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Cutaneous microbiota play an important role in protecting fish against pathogens. Aphanomyces infection causes epizootic ulcerative syndrome (EUS) in fish, and by perturbing the integrity of the cutaneous microbiota, increases the potential for infection by pathogenic bacteria. However, whether the composition of the cutaneous microbiota is altered in fish with EUS, and if so, which species are changed and how this might influence infected fish, is still largely unclear. Considering the importance of cutaneous microbiota in maintaining host health, we hypothesized that Aphanomyces infection significantly enhances the presence of certain bacterial pathogens in the cutaneous microbiota and causes cutaneous dysbacteriosis. To test this hypothesis, we compared the cutaneous microbiota compositions of hybrid snakehead (Channa maculata♀ × Channa argus♂) with and without Aphanomyces infection using Illumina Miseq sequencing of the 16S rRNA gene. Our results showed that the cutaneous microbiota of hybrid snakehead were significantly altered subsequent to EUS infection and that the numbers of potentially pathogenic bacteria classified into the genera Anaerosinus, Anaerovorax, Dorea, and Clostridium were significantly enhanced in the cutaneous microbiota of hybrid snakehead with EUS, whereas bacteria classified into the genera Arthrobacter, Dysgonomonas,

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Epizootic ulcerative syndrome (EUS) in fish: history and current status of understanding

Cited by 27 publications

References 43 publications

Isolation of Aphanomyces invadans Associated with Skin Lesions in African Catfish" Clarias gariepinus"

Isolation of Aphanomyces invadans Associated with Skin Lesions in African Catfish" Clarias gariepinus"

Mitochondrial genomes and comparative genomics of Aphanomyces astaci and Aphanomyces invadans

Peer Review #2 of "Epizootic ulcerative syndrome causes cutaneous dysbacteriosis in hybrid snakehead (Channa maculata♀ × Channa argus♂) (v0.1)"

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