Aeromonas salmonicida isolated from wild and farmed fish and invertebrates in Oman

Al-Ghabshi, Aliya; Austin, Brian; Crumlish, Margaret

doi:10.1007/s40071-018-0195-4

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…A previous study in Croatia found 26 species of A. hydrophila in 336 wild freshwater fish, where only 3.5% showed signs of acute infection ( Topić Popovic et al, 2000 ). A study in Oman has reported A. salmonicida in 9/417 fish with no clinical signs of the disease ( Alghabshi et al, 2018 ). These results support our findings as we report A. hydrophila in trout without signs of clinical infection, contradicting the widely held view that Aeromonas spp.…”

Section: Discussionmentioning

confidence: 99%

Detection of pathogenic Aeromonas hydrophilafrom two rainbow trout (Oncorhynchus mykiss) farms in Peru

Moya‐Salazar

Díaz

Cañari³

et al. 2022

Braz. J. Vet. Med.

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Section: Discussionmentioning

confidence: 99%

Detection of pathogenic Aeromonas hydrophilafrom two rainbow trout (Oncorhynchus mykiss) farms in Peru

Moya‐Salazar

Díaz

Cañari³

et al. 2022

Braz. J. Vet. Med.

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“…Similarly, the low quantity of A. salmonicida detected in the different samples examined in the current study should be likewise given importance due to the fact that A. salmonicida is a known aetiologic agent of furunculosis in salmonids including rainbow trout ( O. mykiss ) and coho salmon ( O. kisutch ) and causes ulcer disease in cyprinids and marine flatfish (Austin & Austin, 2016; Lim & Hong, 2020). Interestingly, A. salmonicida strains isolated from wild fish, including red spot emperor ( Lethrinus lentjan ), king soldier bream ( Argyrops spinifer ), white‐spotted rabbit fish ( Siganus canaliculatus ) and one farmed tilapia ( O. niloticus ) in Oman did not show any evidence of pathogenicity when tested in laboratory‐based experiments using rainbow trout and Nile tilapia as experimental animals despite the fact that cytotoxic enterotoxin ast gene was found widely distributed among the isolates examined (Alghabshi, Austin, & Crumlish, 2018). The detection of different virulence factors possessed by the six A. salmonicida isolates recovered from the water, sediment and gills of apparently healthy tilapia in the present study (Table 4) and their concomitant pathogenicity to naïve tilapia is therefore worthy of thorough investigation.…”

Section: Discussionmentioning

confidence: 99%

Aeromonasload and species composition in tilapia (Oreochromis niloticus) cultured in earthen ponds in the Philippines

2020

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Aeromonas load and species composition in the rearing water, sediment, gills and intestines of healthy tilapia Oreochromis niloticus collected every 2 weeks from Days 30 to 120 after stocking in six earthen ponds in the Philippines were determined. Presumptive Aeromonas counts (PACs) in the water and sediment ranged from 10 1-10 3 c.f.u./ml and 10 1-10 3 c.f.u./g while in the gills and intestines, PACs ranged from 10 4-10 7 c.f.u./g and 10 2-10 5 c.f.u./g, respectively. Presumptive Aeromonas counts in the water, sediment, and gills of tilapia varied among days of culture while in the intestines of tilapia, PACs markedly dropped by approximately 2 logs at Day 75 and either remained in the same level or decreased by another 1 log at Day 120 of growout culture. Aeromonas hydrophila predominantly constituted 94% of all presumptive Aeromonas spp. examined (n = 343), followed by A. sobria (4%) and A. salmonicida (2%). Taken together, current data provide some putative threshold levels of tilapia reared in earthen ponds to Aeromonas spp. The dominance of A. hydrophila together with negligible population of A. salmonicida and A. sobria indicate that Aeromonas are common commensal bacteria in tilapia and their environment which under conditions of stress could instigate disease epizootics.

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“…Aeromonas species of bacteria like A. veronii, A. hydrophila, A. salmonicida and A. sobria also cause life intimidating diseases like epidemic septicaemia, furunculosis, ulcer disease and mortality in Nile tilapia, Oreochromis niloticus, blunt snout bream, salmonids, cyprinids, Garra rufa, etc. [39][40][41][42] .…”

Section: Discussionmentioning

confidence: 99%

Isolation and evaluation of antibacterial potentiality of phytochemicals from the flowers of medicinal plant, Callistemon linearis

2020

JCBSC

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Medicines derived from plant parts nowadays give an alternative source of remedies for microbial infections. The present study was concerned with the evaluation of antibacterial activity of flower extract of Callistemon linearis with isolation and characterization of responsible active ingredients. Antibacterial activity was evaluated against twelve pathogenic bacteria by standard procedure. Diameter of Zone of Inhibition and Minimum Inhibitory Concentrations were compared with commercially available standard antibiotics. Thin Layer Chromatography of the solvent extract, phytochemical analysis, FT-IR and GC-MS analyses were also carried out by standard protocol for identification of bioactive compound/s. All the experiments were repeatedly done. Methanolic and aqueous extracts of Callistemon linearis flowers showed notable zone of inhibition against the used bacteria with maximum effect against Bacillus subtilis by methanolic extract. Phytochemical analyses and FT-IR analysis showed presence of various functional groups in the methanolic extract. From the GC-MS data, secondary metabolite, Dibutyl phthalate was detected, which is remarkably active against tested bacteria and showed MIC values at the concentration of 25-50 µg/ml. This study highlights broad spectrum antibacterial activity of C. linearis against disease causing bacteria. In near future, from its isolated secondary metabolites, new drug formulations against selected bacteria are possible.

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Aeromonas salmonicida isolated from wild and farmed fish and invertebrates in Oman

Cited by 13 publications

References 34 publications

Detection of pathogenic Aeromonas hydrophilafrom two rainbow trout (Oncorhynchus mykiss) farms in Peru

Detection of pathogenic Aeromonas hydrophilafrom two rainbow trout (Oncorhynchus mykiss) farms in Peru

Aeromonasload and species composition in tilapia (Oreochromis niloticus) cultured in earthen ponds in the Philippines

Isolation and evaluation of antibacterial potentiality of phytochemicals from the flowers of medicinal plant, Callistemon linearis

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