Diagnosis of Aeromonas sobria and Saprolegnia sp. co-infection in rainbow trout fry (Oncorhynchus mykiss)

Yardımcı, Remziye Eda; Turgay, Emre

doi:10.3153/ar21006

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…Egg deaths in freshwater hatchery systems are reported because of fungal infestations (Thoen et al, 2011). However, some studies show that bacteria in trout hatchery systems can also cause the deaths of fish (Declercq et al, 2013;Yardımcı and Turgay, 2021). Bacterial contamination studies generally have been conducted on trout eggs to determine the negative effects of various bacteria.…”

Section: Discussionmentioning

confidence: 99%

Effects of Lactococcus lactis and Bacillus sp. on Hatchery Performance of Rainbow Trout (Oncorhynchus mykiss) Eggs until Larval Stage

PİRANLIOĞLU¹,

İpek

et al. 2023

Acta Aquatica Turcica

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In this study, the effect of two Gram-positive bacteria, Lactococcus lactis and Bacillus sp., on the survival rate of rainbow trout (Oncorhynchus mykiss) eggs until larval stage. And also, effects of bacteria on some water quality criteria and blue sac fry syndrome on alevin stage of fish was investigated during this period. The bacteria contaminated on healthy trout eyed eggs during the incubation period by the immersion method. Two bacterial groups and the control group were designed in duplicate. At the end of the study (fry stage), the survival rates of the eggs were recorded. It was also investigated whether the bacteria reduced the ammonia, nitrite, nitrate and phosphate content of the water and prevented the blue sac syndrome caused by Aeromonas hydrophila. The highest survival rate was observed in trout inoculated with Bacillus sp. (92.5%), followed by L. lactis (70%), and control (45%), respectively. The highest death rates were observed during the alevin stage in all groups. In this study, it was observed that both species of bacteria contributed to the survival rate of the trout eggs during the incubation period. It was determined that both species of bacteria reduced the amount of nitrite in the water. Furthermore, with this study, Bacillus sp. was observed to suppress the effects of blue sac fry syndrome caused by A. hydrophila.

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Section: Discussionmentioning

confidence: 99%

Effects of Lactococcus lactis and Bacillus sp. on Hatchery Performance of Rainbow Trout (Oncorhynchus mykiss) Eggs until Larval Stage

PİRANLIOĞLU¹,

İpek

et al. 2023

Acta Aquatica Turcica

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“…However, it's worth noting that Ichthyobodo spp. are opportunistic parasites that tends to thrive in hosts that have weakened immune systems due to stressors or other infections such as SAV or Aeromonas sobria (Repstad, 2011; Yardimci & Turgay, 2021). Saprolegnia spp.…”

Section: Discussionmentioning

confidence: 99%

“…Saprolegnia spp. have already been isolated in association with A. sobria during an outbreak in rainbow trout fry ( Oncorhynchus mykiss ) (Yardimci & Turgay, 2021). However, the recurring presence of Ichthyobodo spp.…”

Section: Discussionmentioning

confidence: 99%

Multiple Aeromonas strains isolated from Atlantic salmon (Salmo salar) displaying red skin disease signs in Scandinavian rivers

Lagadec,

Mjølnerød,

Jensen

et al. 2023

Journal of Fish Diseases

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Since 2014, Atlantic salmon (Salmo salar L.) displaying clinical signs of red skin disease (RSD), including haemorrhagic and ulcerative skin lesions, have been repeatedly observed in Swedish rivers. Although the disease has since been reported in other countries, including Norway, Denmark, Ireland and the UK, no pathogen has so far been conclusively associated with RSD. In this study, the presence of 17 fish pathogens was investigated through qPCR in 18 returning Atlantic salmon with clinical signs of the disease in rivers in Sweden and Norway between 2019 and 2021. Several potential pathogens were repeatedly detected, including a protozoan (Ichthyobodo spp.), an oomycete (Saprolegnia spp.) and several bacteria (Yersinia ruckeri, Candidatus Branchiomonas cysticola, Aeromonas spp.). Cultivation on different media from ulcers and internal organs revealed high concentrations of rod‐shaped bacteria typical of Aeromonadaceae. Multilocus phylogenetic analysis of different clones and single gene phylogenies of sequences obtained from the fish revealed concurrent isolation of several bacterial strains belonging to the species A. bestiarum, A. piscicola and A. sobria. While these bacterial infections may be secondary, these findings are significant for future studies on RSD and should guide the investigation of future outbreaks. However, the involvement of Aeromonas spp. as putative primary etiological agents of the disease cannot be ruled out and needs to be assessed by challenge experiments.

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“…Infection with aeromonad bacteria causes MAS, which is most usually associated with A. hydrophila [71,72], but other species such as A. sobria [71,73], A. veronii [74,75], and A. caviae [76] have been documented to have a similar etiology in the past. The Aeromonas genus consists of many species.…”

Section: Motile Aeromonas Septicemia (Mas) Vaccinementioning

confidence: 99%

Current status and advances of fish vaccines in Malaysia

Ridzuan

Abdullah²,

Ramly³

et al. 2022

Vet World

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Fish diseases have a significant negative influence on the Malaysian aquaculture industry. Since the 1980s, the sector has grown in size, which has resulted in a rise in the prevalence of infectious outbreaks affecting both freshwater and marine cultured fish species. Demand for commercially available fish vaccinations is predicted to increase as infectious disease outbreaks continue to occur. In Malaysia, aquaculture vaccine research and development (R&D) are still in its infancy, with most efforts concentrating on producing vaccines against bacterial infections, most notably streptococcosis, vibriosis, and motile Aeromonas septicemia. Despite several attempts, no homegrown vaccine has been effectively introduced into the manufacturing pipeline to date. At the moment, only three imported aquatic vaccines have received full permission, a far cry from the 314 and 60 vaccines licensed in the poultry and porcine industries, respectively. This review will describe recent findings regarding the development of aquaculture vaccines for certain fish species and diseases in Malaysia. In our opinion, R&D on fish vaccines is critical to the aquaculture industry's viability.

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Diagnosis of Aeromonas sobria and Saprolegnia sp. co-infection in rainbow trout fry (Oncorhynchus mykiss)

Cited by 7 publications

References 19 publications

Effects of Lactococcus lactis and Bacillus sp. on Hatchery Performance of Rainbow Trout (Oncorhynchus mykiss) Eggs until Larval Stage

Effects of Lactococcus lactis and Bacillus sp. on Hatchery Performance of Rainbow Trout (Oncorhynchus mykiss) Eggs until Larval Stage

Multiple Aeromonas strains isolated from Atlantic salmon (Salmo salar) displaying red skin disease signs in Scandinavian rivers

Current status and advances of fish vaccines in Malaysia

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