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Salmo salar

ABSTRACT: genome re-sequencing of farmed Atlantic salmon of Scottish origin supplied by Xelect Ltd

PROVIDER: PRJNA378201 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5585860_1.fastq.gz	Fastqsanger.gz
	SRR5585860_2.fastq.gz	Fastqsanger.gz
	SRR5585861_1.fastq.gz	Fastqsanger.gz
	SRR5585861_2.fastq.gz	Fastqsanger.gz
	SRR5585853_1.fastq.gz	Fastqsanger.gz

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The farmed Atlantic salmon (Salmo salar) skin-mucus proteome

Project description:Norway is the largest producer and exporter of farmed Atlantic salmon (Salmo salar) worldwide. Skin disorders correlated with bacterial infections represent an important challenge for fish farmers due to the economic losses caused. Little is known about this topic, thus studying the skin-mucus of Salmo salar and its bacterial community depict a step forward in understanding fish welfare in aquaculture. In this study, we used label free quantitative mass spectrometry to investigate the skin-mucus proteins associated with both Atlantic salmon and bacteria. In addition, the microbial temporal proteome dynamics during 9 days of mucus incubation with sterilized seawater was investigated, in order to evaluate their capacity to utilize mucus components for growth in this environment.

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Gill and liver transcript expression changes associated with gill damage in Atlantic salmon (Salmo salar)

Project description:Gills of teleost fish represent a vital multifunctional organ; however, they are subjected to environmental stressors, causing gill damage. Gill damage is associated with significant losses in the Atlantic salmon aquaculture industry. Gill disorders due to environmental stressors are exacerbated by global environmental changes, especially with open-net pen aquaculture (as farmed fish lack the ability to escape those events). The local and systemic response to gill damage, concurrent with several environmental insults, are not well investigated. We performed field sampling to collect gill and liver tissue after several environmental insults. Using a 44K salmonid microarray platform, we aimed to compare the transcriptomes of pristine and moderately damaged gill tissue. The gill damage-associated biomarker genes and associated qPCR assays arising from this study will be valuable in future research aimed at developing therapeutic diets to improve farmed salmon gill health.

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Project description:Intestinal inflammation, which is often observed in farmed salmon, is caused by anti nutrient in feed ingredients of plant origin. The aim of this study is to increase knowledge of this patholology and to assess effects of physiologically active compounds applied as feed additives.Feeding trial was followed with metabolomic, transcriptomic and bacterial meta genomic analyses.

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Enniatin B and beauvericin prevailing in fish feed affect intestinal cell function and hematological processes in Atlantic salmon (Salmo salar) after acute exposure

Project description:Unintentional use of mold-infested plant-based feed ingredients are sources of mycotoxins in fish feeds. The presence of the emerging mycotoxins ENNB and BEA in Norwegian commercial fish feeds and plant-based feed ingredients has raised concerns regarding the health effects on farmed Atlantic salmon (Salmon salar). Atlantic salmon pre-smolts were exposed to a non-lethal single-dose of BEA and ENNB, and total RNA sequencing of the intestine and liver was carried out to evaluate gut health and identify possible hepatological changes after a single-dose dietary exposure. ENNB and BEA did not give acute toxicity, however ENNB caused the onset of pathways linked to acute intestinal inflammation and BEA exposures caused the onset of hepatic hematological disruption. The prevalence and concentration of ENNB found in today's commercial feed could affect the fish health if consumed over a longer time-period.

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Host-pathogen interaction of Atlantic salmon (Salmo salar) and the ectoparasite, Neoparamoeba perurans in amoebic gill disease

Project description:Marine farmed Atlantic salmon (Salmo salar) are repeatedly susceptible to amoebic gill disease (AGD) caused by the ectoparasite Neoparamoeba perurans over their life cycle. The parasite elicits a highly localized response within the gill epithelium mucosa resulting in multifocal mucoid patches at the site of parasite attachment. This host-pathogen response drives a complex immune reaction within the pathology of the disease, which remains poorly understood. A dual RNA-seq approach was employed using Illumina sequencing technology to investigate both the linteraction between the host and the parasite.

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Project description:A common-garden experiment was carried out to compare two genetically distinct strains of Atlantic salmon (Salmo salar) fed diets formulated with either high (CHO) or low (NoCHO) carbohydrate (starch). Twenty salmon from either a commercial farmed strain or a land-locked population were placed in two tanks (10 fish of each population in each tank) and fed either CHO or NoCHO feeds for 32 days. At the end of the experimental period fish were fasted for 8 h, euthanized and samples of blood and liver collected. Both diet and population had an effect on circulating glucose levels with land-locked salmon showing hypoglycaemia and dietary starch increasing this parameter. In contrast, land-locked salmon showed increased plasma triacylglycerol levels regardless of dietary treatment. This enhanced ability to metabolise dietary starch in land-locked compared to farmed salmon stock was also reflected at a molecular (gene) level as most of the metabolic pathways evaluated in the present study were mainly affected by the factor population rather than by diet. In particular, lower expression of genes for mitochondrial metabolism in land-locked salmon reflects drastic differences in energy metabolism between the populations. The liver transcriptome analysis highlighted some new gene candidates such as elovl6 to evaluate in future studies assessing the capacity of salmonids to cope with feeds containing higher levels of dietary starch.

2018-12-31 | E-MTAB-6188 | biostudies-arrayexpress

Genetic markers of the immune response of Atlantic salmon (Salmo salar) to Infectious Salmon Anemia Virus (ISAV)

Project description:Infectious diseases among fish present an important economic burden for the aquaculture and fisheries industries around the world. For example, the infectious salmon anemia virus (ISAV) is known to infect farmed Atlantic salmon (Salmo salar), and results in millions of dollars of lost revenue to salmon farmers. Although improved management and husbandry practices over the last few years have minimized the losses and the number of outbreaks, the risk of new virulent isolates emerging is still a looming threat to the viability and sustainability of this industry. An understanding of the host-pathogen interactions at the molecular level during the course of an infection thus remains of strategic importance for the development of molecular tools and efficient vaccines capable of minimizing losses in the eventual case of a new outbreak. Using a 32 k cDNA microarray platform (cGRASP), we have studied various signaling pathways and immune regulated genes, activated or repressed, in Atlantic salmon head-kidney during the course of an ISAV infection. Gene expressions were measured at 5 different time-points: 6h, 24h, 3d, 7d and 16d post infection to get an overall view of changes as they occurred in time. The earliest time points showed only a few differentially expressed genes in infected fish, relative to controls, although as time progressed, many additional genes involved in key defense pathways were up-regulated including MHC type I, beta-2 microglobulin, TRIM 25 and CC-chemokine 19. During the latest stage of the infection process, many genes related to oxygen transportation were under-expressed, which correlates well with the anemia observed prior to death in Atlantic salmon infected with virulent strains of ISAV.

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