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Salmon salar feeding

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https://www.readbyqxmd.com/read/29149845/early-nutritional-programming-affects-liver-transcriptome-in-diploid-and-triploid-atlantic-salmon-salmo-salar
#1
L M Vera, C Metochis, J F Taylor, M Clarkson, K H Skjærven, H Migaud, D R Tocher
BACKGROUND: To ensure sustainability of aquaculture, plant-based ingredients are being used in feeds to replace marine-derived products. However, plants contain secondary metabolites which can affect food intake and nutrient utilisation of fish. The application of nutritional stimuli during early development can induce long-term changes in animal physiology. Recently, we successfully used this approach to improve the utilisation of plant-based diets in diploid and triploid Atlantic salmon...
November 17, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29044715/bayesian-genome-wide-association-analysis-for-body-weight-in-farmed-atlantic-salmon-salmo-salar-l
#2
G M Yoshida, J P Lhorente, R Carvalheiro, J M Yáñez
We performed a genome-wide association study to detect markers associated with growth traits in Atlantic salmon. The analyzed traits included body weight at tagging (BWT) and body weight at 25 months (BW25M). Genotypes of 4662 animals were imputed from the 50K SNP chip to the 200K SNP chip using fimpute software. The markers were simultaneously modeled using Bayes C to identify genomic regions associated with the traits. We identified windows explaining a maximum of 3.71% and 3.61% of the genetic variance for BWT and BW25M respectively...
October 17, 2017: Animal Genetics
https://www.readbyqxmd.com/read/28946065/sensitivity-and-toxic-mode-of-action-of-dietary-organic-and-inorganic-selenium-in-atlantic-salmon-salmo-salar
#3
M H G Berntssen, T K Sundal, P A Olsvik, H Amlund, J D Rasinger, V Sele, K Hamre, M Hillestad, L Buttle, R Ørnsrud
Depending on its chemical form, selenium (Se) is a trace element with a narrow range between requirement and toxicity for most vertebrates. Traditional endpoints of Se toxicity include reduced growth, feed intake, and oxidative stress, while more recent finding describe disturbance in fatty acid synthesis as underlying toxic mechanism. To investigate overall metabolic mode of toxic action, with emphasis on lipid metabolism, a wide scope metabolomics pathway profiling was performed on Atlantic salmon (Salmo salar) (572±7g) that were fed organic and inorganic Se fortified diets...
September 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28886690/transcriptome-profiling-of-antiviral-immune-and-dietary-fatty-acid-dependent-responses-of-atlantic-salmon-macrophage-like-cells
#4
Khalil Eslamloo, Xi Xue, Jennifer R Hall, Nicole C Smith, Albert Caballero-Solares, Christopher C Parrish, Richard G Taylor, Matthew L Rise
BACKGROUND: Due to the limited availability and high cost of fish oil in the face of increasing aquaculture production, there is a need to reduce usage of fish oil in aquafeeds without compromising farm fish health. Therefore, the present study was conducted to determine if different levels of vegetable and fish oils can alter antiviral responses of salmon macrophage-like cells (MLCs). Atlantic salmon (Salmo salar) were fed diets containing 7.4% (FO7) or 5.1% (FO5) fish oil. These diets were designed to be relatively low in EPA + DHA (i...
September 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28735572/early-nutritional-intervention-can-improve-utilisation-of-vegetable-based-diets-in-diploid-and-triploid-atlantic-salmon-salmo-salar-l
#5
Michael Clarkson, Herve Migaud, Christoforos Metochis, Luisa M Vera, Daniel Leeming, Douglas R Tocher, John F Taylor
The present study investigated nutritional programming in Atlantic salmon to improve utilisation of a vegetable-based diet. At first exogenous feeding, fry were fed either a marine-based diet (Diet Mstimulus, 80% fishmeal (FM)/4% fish oil (FO)) or a vegetable-based diet (Diet Vstimulus, 10% FM/0% FO) for 3 weeks. Subsequently, all fish were then fed under the same conditions with a commercial, marine-based, diet for 15 weeks and thereafter challenged with a second V diet (Diet Vchallenge, 10% FM/0% FO) for 6 weeks...
July 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28599361/hydraulic-modelling-of-the-spatial-and-temporal-variability-in-atlantic-salmon-parr-habitat-availability-in-an-upland-stream
#6
Luca Fabris, Iain Archibald Malcolm, Willem Bastiaan Buddendorf, Karen Jane Millidine, Doerthe Tetzlaff, Chris Soulsby
We show how spatial variability in channel bed morphology affects the hydraulic characteristics of river reaches available to Atlantic salmon parr (Salmo salar) under different flow conditions in an upland stream. The study stream, the Girnock Burn, is a long-term monitoring site in the Scottish Highlands. Six site characterised by different bed geometry and morphology were investigated. Detailed site bathymetries were collected and combined with discharge time series in a 2D hydraulic model to obtain spatially distributed depth-averaged velocities under different flow conditions...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28490257/tissue-distribution-and-elimination-of-deoxynivalenol-and-ochratoxin-a-in-dietary-exposed-atlantic-salmon-salmo-salar
#7
Aksel Bernhoft, Helga R Høgåsen, Grethe Rosenlund, Lada Ivanova, Marc H G Berntssen, Jan Alexander, Gunnar Sundstøl Eriksen, Christiane Kruse Fæste
Post-smolt Atlantic salmon (Salmo salar) were fed standard feed with added 2 or 6 mg kg(-1) pure deoxynivalenol (DON), 0.8 or 2.4 mg kg(-1) pure ochratoxin A (OTA), or no added toxins for up to 8 weeks. The experiments were performed in duplicate tanks with 25 fish each per diet group, and the feed was given for three 2-h periods per day. After 3, 6 and 8 weeks, 10 fish from each diet group were sampled. In the following hours after the last feeding at 8 weeks, toxin elimination was studied by sampling three fish per diet group at five time points...
July 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28488356/early-life-traits-of-farm-and-wild-atlantic-salmon-salmo-salar-and-first-generation-hybrids-in-the-south-coast-of-newfoundland
#8
D Hamoutene, J Perez-Casanova, K Burt, L Lush, J Caines, C Collier, R Hinks
This study examined fertilization rates, survival and early life-trait differences of pure farm, wild and first generation (F1) hybrid origin embryos after crossing farm and wild Atlantic salmon Salmo salar. Results show that despite a trend towards higher in vitro fertilization success for wild females, differences in fertilization success in river water are not significantly different among crosses. In a hatchery environment, wild females' progeny (pure wild and hybrids with wild maternal parent) hatched 7-11 days earlier than pure farm crosses and hybrids with farm maternal parents...
May 9, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28480037/effect-of-short-term-regulated-temperature-variations-on-the-swimming-economy-of-atlantic-salmon-smolts
#9
C M Alexandre, A P Palstra
Migratory species travelling long distances between habitats to spawn or feed are well adapted to optimize their swimming economy. However, human activities, such as river regulation, represent potential threats to fish migration by changing environmental parameters that will have impact on their metabolism. The main objective of this study was to evaluate the changes in the swimming energetics of a salmonid species, Atlantic salmon (Salmo salar L.), caused by short-term temperature variations that usually result from the operation of hydroelectrical dams...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28413727/a-transdisciplinary-approach-to-the-initial-validation-of-a-single-cell-protein-as-an-alternative-protein-source-for-use-in-aquafeeds
#10
Michael Tlusty, Andrew Rhyne, Joseph T Szczebak, Bradford Bourque, Jennifer L Bowen, Gary Burr, Christopher J Marx, Lawrence Feinberg
The human population is growing and, globally, we must meet the challenge of increased protein needs required to feed this population. Single cell proteins (SCP), when coupled to aquaculture production, offer a means to ensure future protein needs can be met without direct competition with food for people. To demonstrate a given type of SCP has potential as a protein source for use in aquaculture feed, a number of steps need to be validated including demonstrating that the SCP is accepted by the species in question, leads to equivalent survival and growth, does not result in illness or other maladies, is palatable to the consumer, is cost effective to produce and can easily be incorporated into diets using existing technology...
2017: PeerJ
https://www.readbyqxmd.com/read/28403232/an-oil-containing-epa-and-dha-from-transgenic-camelina-sativa-to-replace-marine-fish-oil-in-feeds-for-atlantic-salmon-salmo-salar-l-effects-on-intestinal-transcriptome-histology-tissue-fatty-acid-profiles-and-plasma-biochemistry
#11
Mónica B Betancor, Keshuai Li, Matthew Sprague, Tora Bardal, Olga Sayanova, Sarah Usher, Lihua Han, Kjell Måsøval, Ole Torrissen, Johnathan A Napier, Douglas R Tocher, Rolf Erik Olsen
New de novo sources of omega 3 (n-3) long chain polyunsaturated fatty acids (LC-PUFA) are required as alternatives to fish oil in aquafeeds in order to maintain adequate levels of the beneficial fatty acids, eicosapentaenoic and docosahexaenoic (EPA and DHA, respectively). The present study investigated the use of an EPA+DHA oil derived from transgenic Camelina sativa in Atlantic salmon (Salmo salar) feeds containing low levels of fishmeal (35%) and fish oil (10%), reflecting current commercial formulations, to determine the impacts on tissue fatty acid profile, intestinal transcriptome, and health of farmed salmon...
2017: PloS One
https://www.readbyqxmd.com/read/28280951/effects-of-dietary-n-3-fatty-acids-on-toll-like-receptor-activation-in-primary-leucocytes-from-atlantic-salmon-salmo-salar
#12
Marianne Arnemo, Arturas Kavaliauskis, Adriana Magalhaes Santos Andresen, Marta Bou, Gerd Marit Berge, Bente Ruyter, Tor Gjøen
The shortage of the n-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on the international markets has led to increasing substitution of fish oil by plant oils in Atlantic salmon (Salmo salar) feed and thereby reducing the EPA and DHA content in salmon. However, the minimum required levels of these fatty acids in fish diets for securing fish health are unknown. Fish were fed with 0, 1 or 2% EPA or DHA alone or in combination of both over a period, growing from 50 to 400 g. Primary head kidney leucocytes were isolated and stimulated with Toll-like receptor (TLR) ligands to determine if EPA and DHA deficiency can affect expression of important immune genes and eicosanoid production...
August 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28266549/parasitism-perturbs-the-mucosal-microbiome-of-atlantic-salmon
#13
M S Llewellyn, S Leadbeater, C Garcia, F-E Sylvain, M Custodio, K P Ang, F Powell, G R Carvalho, S Creer, J Elliot, N Derome
Interactions between parasite, host and host-associated microbiota are increasingly understood as important determinants of disease progression and morbidity. Salmon lice, including the parasitic copepod Lepeophtheirus salmonis and related species, are perhaps the most important problem facing Atlantic Salmon aquaculture after feed sustainability. Salmon lice parasitize the surface of the fish, feeding off mucus, scales and underlying tissue. Secondary bacterial infections are a major source of associated morbidity...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28148974/modelling-growth-performance-and-feeding-behaviour-of-atlantic-salmon-salmo-salar-l-in-commercial-size-aquaculture-net-pens-model-details-and-validation-through-full-scale-experiments
#14
Martin Føre, Morten Alver, Jo Arve Alfredsen, Giancarlo Marafioti, Gunnar Senneset, Jens Birkevold, Finn Victor Willumsen, Guttorm Lange, Åsa Espmark, Bendik Fyhn Terjesen
We have developed a mathematical model which estimates the growth performance of Atlantic salmon in aquaculture production units. The model consists of sub-models estimating the behaviour and energetics of the fish, the distribution of feed pellets, and the abiotic conditions in the water column. A field experiment where three full-scale cages stocked with 120,000 salmon each (initial mean weight 72.1  ± SD 2.8 g) were monitored over six months was used to validate the model. The model was set up to simulate fish growth for all the three cages using the feeding regimes and observed environmental data as input, and simulation results were compared with the experimental data...
November 1, 2016: Aquaculture
https://www.readbyqxmd.com/read/28137252/enhanced-transcriptomic-responses-in-the-pacific-salmon-louse-lepeophtheirus-salmonis-oncorhynchi-to-the-non-native-atlantic-salmon-salmo-salar-suggests-increased-parasite-fitness
#15
Laura M Braden, Ben J G Sutherland, Ben F Koop, Simon R M Jones
BACKGROUND: Outcomes of infections with the salmon louse Lepeophtheirus salmonis vary considerably among its natural hosts (Salmo, Oncorhynchus spp.). Host-parasite interactions range from weak to strong host responses accompanied by high to low parasite abundances, respectively. Parasite behavioral studies indicate that the louse prefers the host Atlantic Salmon (Salmo salar), which is characterized by a weak immune response, and that this results in enhanced parasite reproduction and growth rates...
January 30, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28112067/requirements-of-n-3-very-long-chain-pufa-in-atlantic-salmon-salmo-salar-l-effects-of-different-dietary-levels-of-epa-and-dha-on-fish-performance-and-tissue-composition-and-integrity
#16
Marta Bou, Gerd M Berge, Grete Baeverfjord, Trygve Sigholt, Tone-Kari Østbye, Odd Helge Romarheim, Bjarne Hatlen, Robin Leeuwis, Claudia Venegas, Bente Ruyter
Farmed salmon feeds have changed from purely marine-based diets with high levels of EPA and DHA in the 1990s to the current 70 % plant-based diets with low levels of these fatty acids (FA). The aim of this study was to establish the impacts of low dietary EPA and DHA levels on performance and tissue integrity of Atlantic salmon (Salmo salar). Atlantic salmon (50 g) in seawater were fed fourteen experimental diets, containing five levels (0, 0·5, 1·0, 1·5 and 2·0 %) of EPA, DHA or a 1:1 EPA+DHA plus control close to a commercial diet, to a final weight of 400 g...
January 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28111483/environmental-and-physiological-factors-shape-the-gut-microbiota-of-atlantic-salmon-parr-salmo-salar-l
#17
Carola E Dehler, Christopher J Secombes, Samuel A M Martin
Gut microbes are key players in host immune system priming, protection and development, as well as providing nutrients to the host that would be otherwise unavailable. Due to this importance, studies investigating the link between host and microbe are being initiated in farmed fish. The establishment, maintenance and subsequent changes of the intestinal microbiota are central to define fish physiology and nutrition in the future. In fish, unlike mammals, acquiring intestinal microbes is believed to occur around the time of first feeding mainly from the water surrounding them and their microbial composition over time is shaped therefore by their habitat...
January 20, 2017: Aquaculture
https://www.readbyqxmd.com/read/28101948/influence-of-the-marine-feeding-area-on-the-muscle-and-egg-fatty-acid-composition-of-atlantic-salmon-salmo-salar-spawners-estimated-from-the-scale-stable-isotopes
#18
J Torniainen, M J Kainz, R I Jones, M Keinänen, P J Vuorinen, M Kiljunen
Fatty acids in muscle tissue and eggs of female Atlantic salmon Salmo salar spawners were analysed to evaluate the dietary quality of their final feeding areas in the Baltic Sea. The final likely feeding area was identified by comparing stable carbon and nitrogen isotope composition of the outermost growth region (final annulus) of scales of returned S. salar with that of reference S. salar caught from different feeding areas. Some overlap of stable-isotope reference values among the three areas, in addition to prespawning fasting, decreased the ability of muscle tri-acylglycerols to discriminate the final likely feeding area and the area's dietary quality...
May 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28046109/dietary-yeast-cell-wall-extract-alters-the-proteome-of-the-skin-mucous-barrier-in-atlantic-salmon-salmo-salar-increased-abundance-and-expression-of-a-calreticulin-like-protein
#19
Giulia Micallef, Phillip Cash, Jorge M O Fernandes, Binoy Rajan, John W Tinsley, Ralph Bickerdike, Samuel A M Martin, Alan S Bowman
In order to improve fish health and reduce use of chemotherapeutants in aquaculture production, the immunomodulatory effect of various nutritional ingredients has been explored. In salmon, there is evidence that functional feeds can reduce the abundance of sea lice. This study aimed to determine if there were consistent changes in the skin mucus proteome that could serve as a biomarker for dietary yeast cell wall extract. The effect of dietary yeast cell wall extract on the skin mucus proteome of Atlantic salmon was examined using two-dimensional gel electrophoresis...
2017: PloS One
https://www.readbyqxmd.com/read/28012776/a-novel-in-feed-delivery-platform-applied-for-oral-dna-vaccination-against-ipnv-enables-high-protection-in-atlantic-salmon-salmon-salar
#20
Miguel Reyes, Cesar Ramírez, Ivan Ñancucheo, Ricardo Villegas, Guillermo Schaffeld, Luis Kiman, Javier Gonzalez, Patricio Oyarzun
BACKGROUND: DNA vaccination has emerged as a promising tool against infectious diseases of farmed fish. Oral delivery allows stress-free administration that is ideal for mass immunization and of paramount importance for infectious pancreatic necrosis (IPN) and other viral disease that affect young salmonids and cause economic losses in aquaculture worldwide. METHODS: We describe the development and in vivo assessment of an "in-feed" formulation strategy for oral immunization with liposomal DNA vaccines, by delivering a vaccine construct coding for an immunogenic region of the VP2 capsid protein...
December 21, 2016: Vaccine
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