Aphanomyces as a Fish Parasite

Shanor, Leland; Saslow, Herbert B.

doi:10.1080/00275514.1944.12017563

Cited by 10 publications

(6 citation statements)

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“…Conversely, the invading organisms in these lesions are extremely aggressive, commonly extending to the peritoneal cavity and infecting internal organs, resulting in extensive tissue damage. While internal saprolegniasis has been previously reported it has usually involved infections that originated in the intestinal tract (Agersborg 1933;Shanor & Saslow 1944), or have involved fry where the distance from the skin to internal organs was short (Richards 1978). • Oomycetes are characterized by the production of a 'cotton-ball'-like mycelial mass that is grossly evident on the surface of an affected fish.…”

Section: Discussionmentioning

confidence: 98%

Oomycete fungi associated with ulcerative mycosis in menhaden, Brevoortia tyrannus (Latrobe)

Noga

Dykstra

1986

Journal of Fish Diseases

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Deep necrotic ulcers in Atlantic menhaden, Brevoortia (yrannus (Latrobe), were consistently associated with the presence of oomycete fungi. These organisms were found in over 95% of all lesions both early and late. More than one species of fungus appears to be involved, indicating that these organisms are secondary to some other stressor. However, all characteristically elicit an atypical intense granulomatous inflammatory response and do not behave pathologically as typical oomycetes. Our observation that these fungi appear to be the only organisms consistently present in the earliest stages of the disease indicates that some non-infectious stressor may be responsible for initiating the lesions and subsequently allowing the fungi to induce this atypical response.

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Section: Discussionmentioning

confidence: 98%

Oomycete fungi associated with ulcerative mycosis in menhaden, Brevoortia tyrannus (Latrobe)

Noga

Dykstra

1986

Journal of Fish Diseases

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“…Reports also indicate that A. laevis de Bary has been repeatedly isolated from the guppy Lebistes reticulates (Shanor and Saslow 1944). Similarly, A. stellatus de Bary was isolated from the common carp Cyprinus carpio (Shah et al 1977) and the Japanese eel Anguilla japonica (Hoshina et al 1960).…”

Section: Introductionmentioning

confidence: 92%

“…A. laevis Guppy Shanor and Saslow (1944) A. stellatus Eel Hoshina et al (1960) Common carp Shah et al (1977) A. astaci Crayfish Unestam (1972) A. repetans Crayfish Royo et al (2004) A. frigidophilus Japanese char egg Kitancharoen and Hatai (1997) Crayfish Ballesteros et al (2006) A. invadans (=A. piscicida) Ayu Hatai (1980) Atlantic menharden Dykstra et al (1986) Sea mullet Fraser et al (1992) Yellowfin bream Fraser et al (1992) Sand whiting Fraser et al (1992) Aphanomyces sp.…”

Section: Morphologymentioning

confidence: 98%

Aphanomyces sinensis sp. nov., isolated from juvenile soft-shelled turtle, Pelodiscus sinensis, in Japan

et al. 2011

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A species of Aphanomyces was isolated from juvenile soft-shelled turtles, Pelodiscus sinensis, cultured in Japan. Typically, an infected turtle showed small whitish maculae on the carapace. Many hyphae were observed in the epidermis. The hyphae were isolated using glucoseyeast (GY) agar plates. The morphological characteristics were very similar to those of Aphanomyces laevis, but a clear nuclear spot was observed in the center of the oospore in the strains isolated from the soft-shelled turtles. The optimal growth temperature for the isolates was 25-30°C and the optimum pH was 6-9. Experimental infection tests with isolates produced small whitish maculae on the carapace, and soft-shelled turtles artificially infected with the zoospores showed high mortality, especially in the highdose group. Phylogenetic analysis based on the internal transcribed spacer (ITS) region of ribosomal DNA (rDNA) indicated that the isolates from the soft-shelled turtles were unidentified species of Aphanomyces. As a result, the strain was described as a new species, Aphanomyces sinensis.

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“…This effort helped bring continuity to the variety of reports on fungal fish disease from around the world in which A. invadans had been isolated from the fish suffering from disease. Reports also indicate that A. laevis de Bary has been repeatedly isolated from the guppy Lebistes reticulates (Shanor and Saslow 1944). Similarly, A. stellatus de Bary was isolated from the common carp Cyprinus carpio (Shah et al 1977) and the Japanese eel Anguilla japonica (Hoshina et al 1960).…”

Section: Introductionmentioning

confidence: 92%

“…Growing mycelia were rinsed twice in sterilized tap water with 0.5% NaCl and resuspended in sterilized tap water with 0.5% NaCl to induce development A. laevis Guppy Shanor and Saslow (1944) A. stellatus Eel Hoshina et al (1960) Common carp Shah et al (1977) A. astaci Crayfish Unestem (1972) A. repetans Crayfish Royo et al (2004) A. frigidophilus Japanese char egg Kitancharoen and Hatai (1997) Crayfish Ballesteros et al (2006) A. invadans (=A. piscicida)…”

Section: Identificationmentioning

confidence: 99%

A new species, Aphanomyces salsuginosus sp. nov., isolated from ice fish Salangichthys microdon

et al. 2010

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A species of Aphanomyces was isolated from the ice fish Salangichithys microdon living in brackish water in Japan. White cotton-like growth was found on the heads and fins of the fish. Hyphae penetrated into the dermal layers, subcutaneous tissues, muscular layers, and cartilaginous tissue of the mandible and maxilla; these hyphae were associated with cellular debris and lesions in host tissue. White fluffy colonies from subcultures of these growths were isolated on glucose-yeast agar plates with 0.5% sodium chloride (NaCl). These isolates consisted of delicate, slightly wavy, and moderately branched hyphae. Zoosporangia were isodiametric with the vegetative hyphae. Oogonia were abundant and approximately 21-33 lm in diameter, with irregular short papillae. Generally they were spherical or subspherical and only rarely pyriform. Individual oogonia usually contained a single oospore, which was spherical and 19-27 lm in diameter, with a large shiny vesicle. Antheridial branches, when present, were usually androgynous; however, they were sometimes monoclinous or diclinous. The optimal growth temperature of the isolates was 20°C, and cultures grew well at low salinity (0-0.5% NaCl). Phylogenic analysis based on the internal transcribed space 1-5.8S-ITS 2 of the ribosomal RNA gene indicates that these isolates will be an as-yet unidentified species of Aphanomyces.

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Aphanomyces as a Fish Parasite

Cited by 10 publications

References 0 publications

Oomycete fungi associated with ulcerative mycosis in menhaden, Brevoortia tyrannus (Latrobe)

Oomycete fungi associated with ulcerative mycosis in menhaden, Brevoortia tyrannus (Latrobe)

Aphanomyces sinensis sp. nov., isolated from juvenile soft-shelled turtle, Pelodiscus sinensis, in Japan

A new species, Aphanomyces salsuginosus sp. nov., isolated from ice fish Salangichthys microdon

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