Aspergillomycosis in intensively cultured tilapia from Kenya

Olufemi, B. E.; Agius, C.; Roberts, RJ

doi:10.1136/vr.112.9.203

Cited by 21 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results agree with that of this investigation where A. hydrophila was isolated from kidney of naturally infected Oreochromis. The present observation also confirms the earlier observations of the presence of A. niger in fish (Olufemi et al, 1983). However, some of the isolates do differ from the reported species such as its phenotypic characters (Rueger and Koploy, 1980;Guffanti et al, 1986).…”

Section: Discussionsupporting

confidence: 81%

Antimicrobial activity of the cyanobacteriaAnabaena wisconsinense andOscillatoria curviceps against pathogens of fish in aquaculture

El‐Sheekh

Dawah²,

El-Rahman³

et al. 2008

Ann. Microbiol.

View full text Add to dashboard Cite

Cultures of the blue green algae (cyanobacteria) Anabaena wisconsinense and Oscillatoria curviceps were isolated from fish farms and their antimicrobial effects were studied. Solvent extracts of exponential phase algae were screened for antimicrobial activity against different species of Gram positive (Lactobacillus sp. and Bacillus firmus) and Gram negative (Aeromonas hydrophila, Pseudomonas fluorescens and Pseudomonas anguilliseptica) bacteria and the fungi (Aspergillus niger and Saprolegnia parasitica) which were all isolated from diseased fish. Maximum antimicrobial activity was observed with ethanolic extract of O. curviceps against Lactobacillus sp. and Aeromonas hydrophilia, whereas, methanol extracts of A. wisconsinense and O. curviceps had antibacterial effects against B. firmus, A. hydrophila, P. fluorescens, P. anguilliseptica, and the fungi A. niger and S. parasitica. It was also observed that solvent extracts of A. wisconsinense when injected into Oreochromis niloticus which was already injected intraperitoneally with 2 x 10 6 CFU/ml P. anguilliseptica significantly decreased fish mortality from 50 to 12.5%.

show abstract

Section: Discussionsupporting

confidence: 81%

Antimicrobial activity of the cyanobacteriaAnabaena wisconsinense andOscillatoria curviceps against pathogens of fish in aquaculture

El‐Sheekh

Dawah²,

El-Rahman³

et al. 2008

Ann. Microbiol.

View full text Add to dashboard Cite

show abstract

“…2005). In fact, several other species of Aspergillus are capable of infecting immune‐compromised hosts, including humans (Latgé 1999), fish (Olufemi et al . 1983), marine mammals (Sweeney et al .…”

Section: Discussionmentioning

confidence: 99%

Globally panmictic population structure in the opportunistic fungal pathogen Aspergillus sydowii

2008

View full text Add to dashboard Cite

Recent outbreaks of new diseases in many ecosystems are caused by novel pathogens, impaired host immunity, or changing environmental conditions. Identifying the source of emergent pathogens is critical for mitigating the impacts of diseases, and understanding the cause of their recent appearances. One ecosystem suffering outbreaks of disease in the past decades is coral reefs, where pathogens such as the fungus Aspergillus sydowii have caused catastrophic population declines in their hosts. Aspergillosis is one of the best-characterized coral diseases, yet the origin of this typically terrestrial fungus in marine systems remains unknown. We examined the genetic structure of a global sample of A. sydowii, including isolates from diseased corals, diseased humans, and environmental sources. Twelve microsatellite markers reveal a pattern of global panmixia among the fungal isolates. A single origin of the pathogen into marine systems seems unlikely given the lack of isolation by distance and lack of evidence for a recent bottleneck. A neighbour-joining phylogeny shows that sea fan isolates are interspersed with environmental isolates, suggesting there have been multiple introductions from land into the ocean. Overall, our results underscore that A. sydowii is a true opportunist, with a diversity of nonrelated isolates able to cause disease in corals. This study highlights the challenge in distinguishing between the role of environment in allowing opportunistic pathogens to increase and actual introductions of new pathogenic microorganisms for coral diseases.

show abstract

“…fungi are now recognized as being capable of causing systemic disease in cultured tilapias, as well as the more widely recognized aflatoxicosis caused by elaboration of their toxin outwith the fish (Olufemi & Roberts 1983b). Clinical infections have been described and experimental infections have been induced by means of parenteral injection of pure cultures (Olufemi 1984). It is likely that infections in commercial farms are associated with feeding on artificial diets contaminated with the fungus, so the following experiments were carried out using artificially contaminated pelleted feed in order to demonstrate that this is readily feasible and produces the characteristic pathology associated with the condition in the field.…”

Section: Introductionmentioning

confidence: 99%

Induction of clinical aspergillomycosis by feeding contaminated diet to tilapia, Oreochromis niloticus (L.)

Olufemi

Roberts

1986

Journal of Fish Diseases

View full text Add to dashboard Cite

Oreochromis niloticus maintained at 17°C and 26°C were fed a pelleted diet contaminated with cultures of Aspergillus flavus fungus. Affected fish stopped feeding within one week, and became inactive, dark and oedematous. Exophthalmia, often accompanied by corneal or humoral changes, was common and mortahties commenced after 4 weeks. Surviving fish were sacrificed after 5 weeks and the fungus was isolated from all organs, including-irregularly-the eye. The histopathology was predominantly that of a necrotizing septicaemia, with fungal hyphae present in hver, peritoneum, kidney, intestinal wall and, distinctively, in the orbit and eye of affected fish.

show abstract

Aspergillomycosis in intensively cultured tilapia from Kenya

Cited by 21 publications

References 0 publications

Antimicrobial activity of the cyanobacteriaAnabaena wisconsinense andOscillatoria curviceps against pathogens of fish in aquaculture

Antimicrobial activity of the cyanobacteriaAnabaena wisconsinense andOscillatoria curviceps against pathogens of fish in aquaculture

Globally panmictic population structure in the opportunistic fungal pathogen Aspergillus sydowii

Induction of clinical aspergillomycosis by feeding contaminated diet to tilapia, Oreochromis niloticus (L.)

Contact Info

Product

Resources

About