Pathogenic Myxobacteria

Ordal, Erling J.; Rucker, R. R.

doi:10.3181/00379727-56-14572

Cited by 79 publications

(45 citation statements)

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“…Higher incidence of the disease was found at water temperatures of about is °C, experimentally confirmed in salmon by Ordal and Rucker (1944). Hard water containing larger amounts of organic matter is more favourable for survival of Fl.…”

Section: Epidermal Necrosis Gills Ulceration Flexibacter Columnarimentioning

confidence: 76%

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Columnarosis in Rainbow Trout (Salmo gairdneri R.) in Czechoslovakia

Řehulka¹,

MráZ²

1982

Acta Vet. Brno

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itehulka J., O. Mraz: Columnarosis in Rainbow Trout (Salmo gairdneri R.) inCzechoslovakia. Acta vet. Bmo, 51,1982: 125-137.The first outbreak of columnarosis in Czechoslovakia is described. The disease was observed from the beginning of May until the end of August 1980 in connection with feeding experiments performed under river and dam-lake conditions.In river water (9.8 0c), oval light spots were found on various parts of the fish body. In dam-lake water (16.2 °C), also ulceration of the musculature or even exposure of bones of the diseased fish was observed. The course of the epizootic also differed at the two temperatures. In the first case it lasted 20 days with a loss of 390 fish (i.e. 13 %), while in the second the course was protracted throughout the entire feeding experiment and the total loss amounted 1440 fish (i.e. 24 %).

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Section: Epidermal Necrosis Gills Ulceration Flexibacter Columnarimentioning

confidence: 76%

“…Clusters of the organisms in cultures were erroneously described as sporangia by Ordal and Rucker (1944) and the authors transferred it into the genus Chondrococcus. The real situation was only recognized by Garnjobst (1945).…”

Section: Epidermal Necrosis Gills Ulceration Flexibacter Columnarimentioning

confidence: 99%

Columnarosis in Rainbow Trout (Salmo gairdneri R.) in Czechoslovakia

Řehulka¹,

MráZ²

1982

Acta Vet. Brno

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“…Flavobacterium columnare the agent of columnaris disease was first described by Davis in 1922 as Bacillus columnaris and it was isolated by Ordal and Rucker (1944) and called Chondrococcus columnaris. It was subsequently called Flexibacter columnaris (Leadbetter, 1974), but in 1996 it was transferred to the genus Flavobacterium and was validated by publication in the International Journal of Systematic Bacteriology (Bernardet et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of Flavobacterium columnare (Bernardet et al. 2002) from four tropical fish species in Brazil

Pilarski

Rossini

Ceccarelli³

2008

Braz. J. Biol.

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Flavobacterium columnare is the causative agent of columnaris disease in freshwater fish, implicated in skin and gill disease, often causing high mortality. The aim of this study was the isolation and characterization of Flavobacterium columnare in tropical fish in Brazil. Piracanjuba (Brycon orbignyanus), pacu (Piaractus mesopotamicus), tambaqui (Colossoma macropomum) and cascudo (Hypostomus plecostomus) were examined for external lesions showing signs of colunmaris disease such as greyish white spots, especially on the head, dorsal part and caudal fin of the fish. The sampling comprised 50 samples representing four different fish species selected for study. Samples for culture were obtained by skin and kidney scrapes with a sterile cotton swabs of columnaris disease fish and streaked onto Carlson and Pacha (1968) artificial culture medium (broth and solid) which were used for isolation. The strains in the liquid medium were Gram negative, long, filamentous, exhibited flexing movements (gliding motility), contained a large number of long slender bacteria and gathered into 'columns'. Strains on the agar produced yellow-pale colonies, rather small, flat that had rhizoid edges. A total of four Flavobacterium columnare were isolated: 01 Brycon orbignyanus strain, 01 Piaractus mesopotamicus strain, 01 Colossoma macropomum strain, and 01 Hypostomus plecostomus strain. Biochemical characterization, with its absorption of Congo red dye, production of flexirubin-type pigments, H 2 S production and reduction of nitrates proved that the isolate could be classified as Flavobacterium columnare. Keywords

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“…However, cell yields were frequently low and conversion to spheroplasts often observed. Descriptions of the utilization of carbohydrate, vitamins and salts by F. columnaris have been confusing (ORDAL and RUCKER, 1944;NIGRELLI and HUTNER, 1945;GARNJOBST, 1945;PACHA, 1961;CHASE, 1965;LEADBETTER, 1974;SHIEH, 1980). Selection of an optimal medium capable of providing high cell yields with reproducible growth rates for large-scale production of vaccines was the objective of this research.…”

mentioning

confidence: 99%

“…Host fish are represented by freshwater and anadromous species, warm-water and cold-water inhabitants, fingerling to adults from both natural and cultured popula tions. There are six media commonly used for cultivation of F. columnaris (ORDAL and RUCKER, 1944;GARNJOBST, 1945;ANACKER and ORDAL, 1959;CHASE, 1965;SHIEH, 1980;LIEWES et al, 1982). However, cell yields were frequently low and conversion to spheroplasts often observed.…”

mentioning

confidence: 99%