Relationship Between the Productivity Losses of Tilapia and Aeromonas veronii Infection

Reda, Rasha M.; El-Murr, Abdelhakeem; Elhakim, Yasser Abd; El-Shahat, Wessam

doi:10.21608/zvjz.2021.68864.1134

Cited by 5 publications

(2 citation statements)

References 70 publications

(154 reference statements)

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“…The infection has been previously reported in many cultured freshwater fish species, including Carassius auratus, Cyprinus carpio, Ctenopharyngodon idella and Silurus asotus (Li et al, 2020), Oreochromis niloticus (Reda et al, 2022), carp (Ran et al, 2018), Leiocassis longirostris (Cai et al, 2012), Astronotus ocellatus, Carassius Carassius (Sreedharan et al, 2013) and Lateolabrax maculatus (Wang et al, 2021). Meanwhile, A. veronii infection is less abundant in cultured marine fishes as it was reported only from diseased European seabass (Smyrli et al, 2019;Tanrıkul & Dincturk, 2021).…”

Section: Ta B L E 4 Virulence Genes Profile Of the Recovered Aeromona...mentioning

confidence: 96%

The role of Aeromonas genotyping in virulence for Dicentrarchus labrax

Aboyadak,

Soliman,

Nageeb

et al. 2023

Journal of Fish Diseases

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Aeromonas septicemia still represents a serious challenge facing the global aquaculture sector. In the present study, Aeromonas caviae and A. veronii were isolated from four diseased European seabass (Dicentrarchus labrax) farms experiencing a high mortality rate. Diseased fish showed haemorrhages on the external body surface with exophthalmia, cataracts, scale desquamation, skin ulcers and fin erosions. The most common post‐mortem findings were congested internal organs, particularly the liver and posterior kidney. Twenty‐eight A. Veronii and 11 A. caviae isolates were identified biochemically by the Vitek 2 system and then confirmed by PCR and phylogenetic analysis. Hemolysin (hlyA) and aerolysin (aer) were the most abundant virulence genes in the recovered isolates, followed by cytotoxic enterotoxin (act) and heat‐stable enterotoxin (ast). A. caviae was more virulent than A. veronii for D. labrax fingerlings as LD50 ranging between (>1 × 108–6.2 × 107) for A. veronii and (2.9 × 107–8.3 × 107) for A. caviae. The sensitivity test indicated the effectiveness of norfloxacin, doxycycline and oxytetracycline against the tested isolates. Serum cortisol significantly increased in the infected groups, while catalase and glutathione peroxidase activities significantly decreased at 2 days post‐infection (DPI) and then increased at 6 DPI. The presence of virulence genes was associated with bacterial pathogenicity expressed in fish mortality rate. Virulence genes also drastically affect cortisol levels more than catalase and glutathione peroxidase levels.

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Section: Ta B L E 4 Virulence Genes Profile Of the Recovered Aeromona...mentioning

confidence: 96%

The role of Aeromonas genotyping in virulence for Dicentrarchus labrax

Aboyadak,

Soliman,

Nageeb

et al. 2023

Journal of Fish Diseases

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“…The increased prevalence obtained from the earthen ponds when compared to concrete and plastic tanks may be due to the increased abundance of bacteria associated with the increased trophic state of earthen ponds. This association tends to be stronger in finer textured sediment which is strongly influenced by the type and quantity of clay minerals and organic matter present promoting the increase and persistence of the bacteria in the environment as seen in earthen ponds but which differs in both concrete and plastic tanks (Hassard et al, 2016;Luo, et al, 2019) One of the most significant constraints on fish productivity is outbreaks of Aeromonas disease on the fish farms (Nhinh et al, 2021;Reda et al, 2021) and knowledge about the prevalent Aeromonas species is needed for management and prevention of diseases on the farm. In this present study, the overall prevalence of Aeromonas species recorded from C. gariepinus reared in the different culture facilities in the study area was 29.86%, this is however higher than the prevalence of 19.6% reported by Adah et al .…”

Section: Prevalence Of the Different Species Of Aeromonas From Fish F...mentioning

confidence: 99%

Prevalence of Aeromonas species in Clarias gariepinus and water from different culture facilities in fish farms in Kwara State, Nigeria

2023

JoSVAS

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Aeromonas species are associated with diseases on fish farms leading to mortality and economic losses. In order to determine the prevalence and diversity of Aeromonas species from water and Clarias gariepinus cultured in the different holding facilities; five hundred and seventy six Clarias gariepinus fish and one hundred and eight water samples were randomly sampled from fish farms in Kwara State. The samples were clinically and bacteriologically examined and confirmed using Oxiod rapid microbat identification test kits for Gram-negative bacteria, Microbact 24E (MB24E). The overall prevalence of Aeromonas species from water from the different cultured facilities revealed water sampled from earthen ponds had the highest prevalence of 66.67 % followed by concrete tanks with a prevalence of 41.66 % and the least prevalence of 30.56 % was recorded for water in plastic tanks. A similar pattern was recorded in Clarias gariepinus from the different holding facilities showing that earthen ponds had the highest prevalence of 40.10 % when compared with concrete tanks 28.65%, and to plastic tanks 20.83 %. Four varying diversities of Aeromonas species comprising of Aeromonas hydrophila, Aeromonas caviae, Aeromonas veronii biovar sobria, and Aeromonas veronii biovar veronii were isolated from both water and fish from the different holding facilities. From this study, cultured Clarias gariepinus were susceptible to Aeromonas species irrespective of the culture facilities. Therefore, there is need for proper management practices and adherence to biosecurity measures to prevent the outbreak and spread of diseases on the farms.

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Therapeutic efficacy of coriander (Coriandrum sativum) enriched diets in Oreochromis niloticus: effect on hepatic-renal functions, the antioxidant-immune response and resistance to Aeromonas veronii

Said

Reda

Metwally

et al. 2023

Fish Physiol Biochem

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In this study, the effects of Coriandrum sativum to control Aeromonas veronii infection in Oreochromis niloticus were determined. Coriandrum sativum extract (CE) was tested in vitro against A. veronii by the disc diffusion assay. In in vivo, 150 O. niloticus (from El-Abbassa, Sharkia, Egypt, weighing 34.95 ± 1.98 g) was distributed in five groups (with three replications) in glass aquariums (80 × 40 × 30 cm). The first group (control) was intraperitoneally injected with 0.2 ml of sterilized tryptic soya broth. Groups 2–5 were intraperitoneally challenged with 0.2 ml of A. veronii (4.3 × 106). The five groups were administered a basal diet until clinical signs appeared, and then therapeutic feeding (15 days) was followed: the first (CONT) and second (AV) groups were administered a normal basal diet. The third (AV+CP) and fourth (AV+CE) groups were administered diets supplemented with C. sativum powder and extract, respectively, each at 30 mg/kg. The fifth group (AV+OT) was administered a diet supplemented with oxytetracycline at 500 mg/kg diet. The results of the in vitro experiment revealed that CE has a zone of inhibition of 43 mm against A. veronii. The in vivo results showed that fish administered a therapeutic diet supplemented with CE showed a significant improvement in hematological, biochemical, and immunological parameters, as well as antioxidant capacity (P < 0.05) and the pathological findings of the liver and kidney tissues. The current findings supported that the administration of a CE-enriched diet (30 mg/kg) is an eco-friendly strategy for controlling A. veronii in O. niloticus.

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Relationship Between the Productivity Losses of Tilapia and Aeromonas veronii Infection

Cited by 5 publications

References 70 publications

The role of Aeromonas genotyping in virulence for Dicentrarchus labrax

The role of Aeromonas genotyping in virulence for Dicentrarchus labrax

Prevalence of Aeromonas species in Clarias gariepinus and water from different culture facilities in fish farms in Kwara State, Nigeria

Therapeutic efficacy of coriander (Coriandrum sativum) enriched diets in Oreochromis niloticus: effect on hepatic-renal functions, the antioxidant-immune response and resistance to Aeromonas veronii

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