Journal of fish diseases, 2020-12, Vol.43 (12), p.1505-1517
2020
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- Autor(en) / Beteiligte
- Titel
- Molecular and histopathological characterization of Photobacterium damselae in naturally and experimentally infected Nile tilapia (Oreochromis niloticus)
- Ist Teil von
- Journal of fish diseases, 2020-12, Vol.43 (12), p.1505-1517
- Ort / Verlag
- England: Blackwell Publishing Ltd
- Erscheinungsjahr
- 2020
- Quelle
- Wiley Online Library Journals【Remote access available】
- Beschreibungen/Notizen
- Mass mortality has occurred among cultured Nile tilapia, Oreochromis niloticus, on fish farms in Manzala, Dakahlia province, Egypt, in the summer season, 2019. Moribund fish were reported with deep ulcers, septicaemic lesions and sampled for bacterial isolation. In this study, most isolates were subjected to bacteriological examination, antibiotic sensitivity test, 16S rRNA gene sequencing and histopathological examination. Following isolate identification, intraperitoneal challenge of Nile tilapia with a bacterial suspension 2 × 106 CFU/ml was performed. Samples from liver, spleen and kidney were collected for histological and biochemical analysis. The results showed a high similarity (99%) to Photobacterium damselae strains using phylogenetic analysis of 16S rRNA. P. damselae exhibited resistance to amoxicillin and erythromycin, as well it was highly sensitive to chloramphenicol and doxycycline. Moreover, haemorrhage, oedema, hemosiderosis and melanomacrophage activation in the liver and head kidney of infected fish were detected by light and electron microscopy. Also, significant higher levels of CAT and SOD in the spleen and head kidney, as well as the serum levels of NO were observed in experimentally challenged O. niloticus, compared to the control fish. Our data identified P. damselae for the first time from infected Nile tilapia, describing its sensitivity to a variety of antibiotics, histopathological alterations and oxidative stress impact, and it could be useful indicators for understanding P. damselae pathogenesis, which might provide a preventive efficacy for P. damselae.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0140-7775eISSN: 1365-2761DOI: 10.1111/jfd.13251Titel-ID: cdi_proquest_miscellaneous_2446990920
- Format
- –
- Schlagworte
- Amoxicillin, Animals, Antibiotics, antioxidative stress, Aquaculture, bacterial sequencing, Biochemical analysis, Chloramphenicol, Chloromycetin, Cichlids - microbiology, Doxycycline, Drug Resistance, Bacterial, Edema, Egypt, Electron microscopy, Erythromycin, Farms, Fish, Fish culture, Fish Diseases - microbiology, Fish Diseases - pathology, Fish farms, Freshwater fishes, Gene sequencing, Gram-Negative Bacterial Infections - microbiology, Gram-Negative Bacterial Infections - pathology, Haemorrhage, Hemorrhage, Hemosiderosis, Histopathology, Kidneys, Lesions, Liver, Marine fishes, Microbial Sensitivity Tests, Microbiological strains, Nile tilapia, Oreochromis niloticus, Oxidative stress, Pathogenesis, Photobacterium - drug effects, Photobacterium - genetics, Photobacterium - isolation & purification, Photobacterium - pathogenicity, Photobacterium damselae, Phylogeny, Ponds, RNA, Ribosomal, 16S, rRNA 16S, Sensitivity, Sensitivity analysis, Serum, Serum levels, Spleen, Tilapia, Ulcers