Dermocystidium sp. infection in cultured juvenile southern catfish Silurus meridionalis in China

Zhang, Qizhong; Wang, Zhijian

doi:10.3354/dao065245

Cited by 20 publications

(22 citation statements)

References 14 publications

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“…(Mesomycetozoa) infections in fish are occasionally characterised by a systemic nodular infection involving visceral organs (Allen et al 1968, McVicar & Wootten 1980, Landsberg & Paperna 1992, Bruno 2001 and share some characteristics with the lesions observed in the present study. However, prominent features of this group include the presence of spores or a thick-walled plasmodium (Bruno 2001, Pekkarinen et al 2003, Feist et al 2004, Zhang & Wang 2005, neither of which were found in the present study.No characteristic features of Myxozoa, such as 'cellin-cell' stages (Lom & Dyková 1999, Dyková & Lom 2007, or of Microsporidia, such as spores, were found in the organisms related to the lesions of Senegalese sole. A myxozoan or microsporidian aetiology is therefore not likely.…”

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confidence: 58%

Histopathological and ultrastructural studies on a novel pathological condition in Solea senegalensis

Constenla¹,

Padrós²

2010

Dis. Aquat. Org.

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A new parasitic disease affecting cultured sole Solea senegalensis (Kaup, 1858) is characterised by the presence of external protuberances in the skin of the affected fish. These lesions correspond to nodules in the muscular tissue showing an abscess-like aspect. Similar lesions were found in the kidney, heart, liver and digestive tract. Histological sections of these nodules revealed the presence of a large core formed mainly of necrotic tissue surrounded with fibroblasts and macrophages. Round-shaped plasmodial organisms were found in the external layer of the nodules and usually inside macrophages or fibroblasts. These organisms were also observed in the intestinal mucosa inside phagocytic cells or parasitophorous vacuoles within the enterocytes. The morphological and ultrastructural characteristics of these organisms are similar to the morphology of some groups of parasites described as fish pathogens. The main features suggest that these organisms could be amoebae or parasites with an amoeboid or plasmodial form in their developmental cycle. KEY WORDS: Solea senegalensis · Flatfish · Histopathology · Granuloma · ParasiteResale or republication not permitted without written consent of the publisher Dis Aquat Org 90: 191-196, 2010 MATERIALS AND METHODSA total of 20 symptomatic Senegalese sole were sampled at the end of 2007 and during 2008 from 2 fish farms where the disease was detected. Moreover, 2 groups of 15 apparently asymptomatic Senegalese sole were randomly sampled in the same facilities in March and April 2008. Blood was extracted from the caudal vein of 5 symptomatic sole and blood smears were stained with a quick stain (Diff-quick ® ).Fish were immediately killed by spinal severance, measured and weighed. Samples of the affected organs from symptomatic sole and samples of liver, spleen, kidney, digestive tract, gills, muscle and heart from asymptomatic sole were dissected, fixed in 10% buffered formalin and processed by routine histology. Sections were stained with haematoxylin and eosin (H&E), and some of these sections were additionally stained with Giemsa and Gram stains.Small portions of the lesions in muscle were processed for transmission electron microscopy (TEM). Samples were fixed in 2.5% glutaraldehyde in 0.1 M cacodylate buffer (pH 7.4), postfixed in 1% osmium tetroxide and embedded in Epon 812 resin. Ultra-thin sections were stained with uranyl acetate and lead citrate prior to examination under a Hitachi H-700 transmission electron microscope. RESULTSMacroscopic lesions consisted of nodules with an abscess-like aspect located in the muscular tissue and also in small nodules in the liver, digestive tract, heart and kidney. These nodules were clearly distinguishable from the rest of the tissues and presented a soft and liquefied consistency. In the digestive tract, these nodules seemed to have a harder consistency.All of the symptomatic fish, 6% of the asymptomatic fish sampled in March and 80% of the asymptomatic fish sampled in April showed histological lesions.Histologi...

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confidence: 58%

Histopathological and ultrastructural studies on a novel pathological condition in Solea senegalensis

Constenla¹,

Padrós²

2010

Dis. Aquat. Org.

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“…() observed spherical cysts in the skin and fins of Cottus gobius . The most similar description of cysts comparing to our findings were found by Zhang and Wang () reporting not identified species of Dermocystidium infecting juvenile specimens of S. meridionalis , elongate worm‐like, with several folds, measuring 3–20 mm in length and 0.15–0.35 mm in width.…”

supporting

confidence: 90%

“…These characteristics of the spores allowed the identification of the parasite as Dermocystidium sp. according to the descriptions of other authors (Eiras & Silva‐Souza, ; El‐Mansy, ; Feist et al., ; Zhang & Wang, ). This is the second reported occurrence of Dermocystidium sp.…”

mentioning

confidence: 99%

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Dermocystidium sp. infection in farmed hybrid fish Colossoma macropomum × Piaractus brachypomus in Brazil

Fujimoto

Couto

Sousa

et al. 2017

Journal of Fish Diseases

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“…The lesions caused by Dermocystidium spp. in fish are chronic and characterized by visible cysts or nodules on skin and fins (Feist, Longshaw, Hurrell, & Mander, ; Wildgoose, ; Zhang & Wang, ), but severe gills and systemic infections causing mortality have been described in several species (Höglund, Alfjorden, & Nikkilä, ; Olson & Holt, ; Athanassopoulou, ; Landsberg & Paperna, ; Kirkbright, Huber, Lillie, & Lumsden, ; Fujimoto et al, ).…”

mentioning

confidence: 99%

Dermocystidium sp. (Mesomycetozoea: Dermocystidiaceae) primary ocular infection in a koi carp (Cyprinus carpio var. koi)

Sirri

Gustinelli

Rubini

et al. 2020

Journal of Fish Diseases

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Dermocystidium sp. infection in cultured juvenile southern catfish Silurus meridionalis in China

Cited by 20 publications

References 14 publications

Histopathological and ultrastructural studies on a novel pathological condition in Solea senegalensis

Histopathological and ultrastructural studies on a novel pathological condition in Solea senegalensis

Dermocystidium sp. infection in farmed hybrid fish Colossoma macropomum × Piaractus brachypomus in Brazil

Dermocystidium sp. (Mesomycetozoea: Dermocystidiaceae) primary ocular infection in a koi carp (Cyprinus carpio var. koi)

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