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https://www.readbyqxmd.com/read/27920797/genome-wide-association-study-for-identifying-loci-that-affect-fillet-yield-carcass-and-body-weight-traits-in-rainbow-trout-oncorhynchus-mykiss
#1
Dianelys Gonzalez-Pena, Guangtu Gao, Matthew Baranski, Thomas Moen, Beth M Cleveland, P Brett Kenney, Roger L Vallejo, Yniv Palti, Timothy D Leeds
Fillet yield (FY, %) is an economically-important trait in rainbow trout aquaculture that affects production efficiency. Despite that, FY has received little attention in breeding programs because it is difficult to measure on a large number of fish and cannot be directly measured on breeding candidates. The recent development of a high-density SNP array for rainbow trout has provided the needed tool for studying the underlying genetic architecture of this trait. A genome-wide association study (GWAS) was conducted for FY, body weight at 10 (BW10) and 13 (BW13) months post-hatching, head-off carcass weight (CAR), and fillet weight (FW) in a pedigreed rainbow trout population selectively bred for improved growth performance...
2016: Frontiers in Genetics
https://www.readbyqxmd.com/read/27913897/rainbow-trout-oncorhynchus-mykiss-pro-oxidant-and-genotoxic-responses-following-acute-and-chronic-exposure-to-the-antibiotic-oxytetracycline
#2
Sara Rodrigues, Sara C Antunes, Alberto T Correia, Bruno Nunes
Oxytetracycline (OTC), an antibacterial agent, is extensively used in aquaculture practices all over the world, but also in human and veterinary medicines. Because of its intensive use, low rates of absorption by treated animals, inadequate disposal, and low efficiency of removal in wastewater treatment plants, the potential harmful effects on aquatic organisms are of great concern. This work aimed to assess the effects of this antibiotic in rainbow trout, following both acute and chronic exposures. Catalase (CAT), total glutathione peroxidase (GPx), glutathione reductase (GRed) activities and lipid peroxidation (TBARS levels) were quantified as oxidative stress biomarkers, in gills and liver...
December 2, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27912771/a-dna-vaccine-encoding-the-viral-hemorrhagic-septicemia-virus-genotype-ivb-glycoprotein-confers-protection-in-muskellunge-esox-masquinongy-rainbow-trout-oncorhynchus-mykiss-brown-trout-salmo-trutta-and-lake-trout-salvelinus-namaycush
#3
Isaac F Standish, Elena V Millard, Travis O Brenden, Mohamed Faisal
BACKGROUND: The viral hemorrhagic septicemia virus (VHSV) is one of the most serious fish pathogens. In 2003, a novel sublineage (genotype IVb) of this deadly virus emerged in the Great Lakes basin causing serious fish kills. We have previously demonstrated that a DNA plasmid (pcDNA), containing a cytomegalovirus (CMV) promoter and the viral hemorrhagic septicemia virus (VHSV) genotype IVb glycoprotein (G) gene insert (designated pVHSivb-G) confers moderate protection in muskellunge (Esox masquinongy), a highly susceptible species upon challenge...
December 2, 2016: Virology Journal
https://www.readbyqxmd.com/read/27910760/immunomodulation-effect-of-aqueous-extract-of-the-artist-s-conk-medicinal-mushroom-ganoderma-applanatum-agaricomycetes-on-the-rainbow-trout-oncorhynchus-mykiss
#4
Azadeh Manayi, Mahdi Vazirian, Fereshteh Hassan Zade, Akram Tehranifard
It is well known that innate immunity in fish can be activated by many synthetic and natural immunos-timulants; several natural substances induced immunity in fish in previous surveys. This study discussed data regarding the effect of Ganoderma applanatum aqueous extract on the defense mechanisms of rainbow trout in feeding trials. Fish were fed 250, 500, and 1000 mg extract/kg diet 4 times daily. Growth, humoral parameters, lysozyme activity, and serum protein concentrations were assessed after a period of 45 days...
2016: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/27908991/genome-sequence-of-the-fish-pathogen-yersinia-ruckeri-strain-150-isolated-from-diseased-rainbow-trout
#5
Desirée Cascales, José A Guijarro, Pilar Reimundo, Ana I García-Torrico, Jessica Méndez
We present here the draft genome of a pathogenic Yersinia ruckeri strain, isolated from rainbow trout (Oncorhynchus mykiss) affected by enteric redmouth disease. The chromosome has 3,826,775 bp, a GC content of 46.88%, and is predicted to contain 3,538 coding sequences. The data will be useful for comparative pathogenicity studies.
December 1, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27899075/thermal-sensitivity-of-growth-indicates-heritable-variation-in-1-year-old-rainbow-trout-oncorhynchus-mykiss
#6
Matti Janhunen, Juha Koskela, Nguyễn Hữu Ninh, Harri Vehviläinen, Heikki Koskinen, Antti Nousiainen, Ngô Phú Thỏa
BACKGROUND: Rainbow trout is an important aquaculture species, which has a worldwide distribution across various production environments. The diverse locations of trout farms involve remarkable variation in environmental factors such as water temperature, which is of major importance for the performance of fish. Thus, robust fish that could thrive under different and suboptimal thermal conditions is a desirable goal for trout breeding. Using a split-family experimental design (40 full-/half-sib groups) for a rainbow trout population derived from the Finnish national breeding program, we studied how two different rearing temperatures (14 and 20 °C) affect feed intake, growth rate and feed conversion ratio in 1-year-old fish...
November 29, 2016: Genetics, Selection, Evolution: GSE
https://www.readbyqxmd.com/read/27893995/combined-effects-of-cadmium-temperature-and-hypoxia-reoxygenation-on-mitochondrial-function-in-rainbow-trout-oncorhynchus-mykiss
#7
John O Onukwufor, Don Stevens, Collins Kamunde
Although aquatic organisms face multiple environmental stressors that may interact to alter adverse outcomes, our knowledge of stressor-stressor interaction on cellular function is limited. We investigated the combined effects of cadmium (Cd), hypoxia-reoxygenation (H-R) and temperature on mitochondrial function. Liver mitochondria from juvenile rainbow trout were exposed to Cd (0-20μM) and H-R (0 and 5min) at 5, 13 and 25°C followed by measurements of mitochondrial Cd load, volume, complex І active (A)↔deactive (D) transition, membrane potential, ROS release and ultrastructural changes...
November 18, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27889532/characterisation-of-zbtb46-and-dc-script-znf366-in-rainbow-trout-transcription-factors-potentially-involved-in-dendritic-cell-maturation-and-activation-in-fish
#8
Jun Wang, Tiehui Wang, Ottavia Benedicenti, Catherine Collins, Kaiyu Wang, Christopher J Secombes, Jun Zou
ZBTB46 and DC-SCRIPT/ZNF366 are two zinc finger transcription factors that play important roles in regulating differentiation of dendritic cells in mammals. In this study, the ZBTB46 and DC-SCRIPT/ZNF366 homologues were identified in rainbow trout Oncorhynchus mykiss and their expression analysed in vivo and in vitro. As transcription factors, they are well conserved in sequence, genomic organisation and gene synteny. Their expression was differentially modulated by bacterial and viral PAMPs in the monocyte/macrophage like cell line RTS-11, in primary head kidney (HK) macrophages, and in HK macrophages cultured with IL-4/13A...
November 23, 2016: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/27877207/sockeye-salmon-repatriation-leads-to-population-re-establishment-and-rapid-introgression-with-native-kokanee
#9
Andrew J Veale, Michael A Russello
Re-establishing salmonid populations to areas historically occupied has the substantial potential for conservation gains; however, such interventions also risk negatively impacting native resident stocks. Here, we assessed the success of the hatchery-assisted reintroduction of anadromous sockeye salmon (Oncorhynchus nerka) into Skaha Lake, British Columbia, Canada, and evaluated the genetic consequences for native kokanee, a freshwater-obligate ecotype, using single nucleotide polymorphism genotypic data collected from the reference samples of spawning Okanagan River sockeye and Skaha Lake kokanee presockeye reintroduction, along with annual trawl survey and angler-caught samples obtained over an eight-year period...
December 2016: Evolutionary Applications
https://www.readbyqxmd.com/read/27877206/genomic-signatures-among-oncorhynchus-nerka-ecotypes-to-inform-conservation-and-management-of-endangered-sockeye-salmon
#10
Krista M Nichols, Christine C Kozfkay, Shawn R Narum
Conservation of life history variation is an important consideration for many species with trade-offs in migratory characteristics. Many salmonid species exhibit both resident and migratory strategies that capitalize on benefits in freshwater and marine environments. In this study, we investigated genomic signatures for migratory life history in collections of resident and anadromous Oncorhynchus nerka (Kokanee and Sockeye Salmon, respectively) from two lake systems, using ~2,600 SNPs from restriction-site-associated DNA sequencing (RAD-seq)...
December 2016: Evolutionary Applications
https://www.readbyqxmd.com/read/27873320/the-behavioural-homing-response-of-adult-chum-salmon-oncorhynchus-keta-to-amino-acid-profiles
#11
E Y Chen, J B K Leonard, H Ueda
Adult chum salmon Oncorhynchus keta homing behaviour in a two-choice test tank (Y-maze) was monitored using a passive integrated transponder (PIT)-tag system in response to river-specific dissolved free amino-acid (DFAA) profiles and revealed that the majority of O. keta showed a preference for artificial natal-stream water and tended to stay in this maze arm for a longer period; natal-stream water was chosen over a nearby tributary's water, but not when the O. keta were presented with a non-tributary water...
November 21, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27873318/tactic-specific-benefits-of-polyandry-in-chinook-salmon-oncorhynchus-tshawytscha
#12
J A Lewis, T E Pitcher
This study examined whether polyandrous female Chinook salmon Oncorhynchus tshawytscha obtain benefits compared with monandrous females through an increase in hatching success. Both of the alternative reproductive tactics present in male O. tshawytscha (large hooknoses and small, precocious jacks) were used, such that eggs were either fertilized by a single male (from each tactic) or multiple males (using two males from the same or different tactics). The results show that fertilized eggs from the polyandrous treatments had a significantly higher hatching success than those from the monandrous treatments...
November 21, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27872197/plasma-exosomes-are-enriched-in-hsp70-and-modulated-by-stress-and-cortisol-in-rainbow-trout
#13
Erin Faught, Lynsi Henrickson, Mathilakath M Vijayan
Exosomes are endosomally-derived vesicles that are secreted from cells and contain a suite of molecules, including proteins and nucleic acids. Recent studies suggest the possibility that exosomes in circulation may be affecting recipient target cell function, but the modes of action are unclear. Here we tested the hypothesis that exosomes are in circulation in fish plasma and that these vesicles are enriched with heat shock protein 70 (Hsp70). Exosomes were isolated from rainbow trout (Oncorhynchus mykiss) plasma using differential centrifugation and their presence confirmed by transmission electron microscopy and the exosomal marker acetylcholinesterase...
November 21, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27865061/setting-spatial-conservation-priorities-despite-incomplete-data-for-characterizing-metapopulations
#14
A H Fullerton, S Anzalone, P Moran, D M Van Doornik, T Copeland, R W Zabel
Management of spatially structured species poses unique challenges. Despite a strong theoretical foundation, practitioners rarely have sufficient empirical data to evaluate how populations interact. Rather, assumptions about connectivity and source-sink dynamics are often based on incomplete, extrapolated, or modeled data, if such interactions are even considered at all. Therefore, it has been difficult to evaluate whether spatially structured species are meeting conservation goals. We evaluated how estimated metapopulation structure responded to estimates of population sizes and dispersal probabilities and to the set of populations included...
December 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27864910/genomic-islands-of-divergence-linked-to-ecotypic-variation-in-sockeye-salmon
#15
Wesley A Larson, Morten T Limborg, Garrett J McKinney, Daniel E Schindler, James E Seeb, Lisa W Seeb
Regions of the genome displaying elevated differentiation (genomic islands of divergence) are thought to play an important role in local adaptation, especially in populations experiencing high gene flow. However, the characteristics of these islands as well as the functional significance of genes located within them remain largely unknown. Here, we used data from thousands of SNPs aligned to a linkage map to investigate genomic islands of divergence in three ecotypes of sockeye salmon (Oncorhynchus nerka) from a single drainage in southwestern Alaska...
November 19, 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27862054/determination-of-target-fat-soluble-micronutrients-in-rainbow-trout-s-muscle-and-liver-tissues-by-liquid-chromatography-with-diode-array-tandem-mass-spectrometry-detection
#16
Virginia Pérez Fernández, Salvatore Ventura, Pierpaolo Tomai, Roberta Curini, Alessandra Gentili
This paper describes an analytical approach, based on liquid chromatography-diode array detection-tandem mass spectrometry (LC-DAD-MS/MS), for characterizing the fat-soluble micronutrient fraction in rainbow trout (Oncorhynchus mykiss). Two different procedures were applied to isolate the analytes from liver and muscle tissue: overnight cold saponification to hydrolyze bound forms and to simplify the analysis; matrix solid phase dispersion (MSPD) to avoid artifacts and to maintain unaltered the naturally occurring forms...
November 12, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27860093/phylogenetic-and-functional-characterization-of-the-distal-intestinal-microbiome-of-rainbow-trout-oncorhynchus-mykiss-from-both-farm-and-aquarium-settings
#17
P P Lyons, J F Turnbull, K A Dawson, M Crumlish
AIMS: This study focused on comparing the phylogenetic composition and functional potential of the intestinal microbiome of rainbow trout sourced from both farm and aquarium settings. METHODS AND RESULTS: Samples of distal intestinal contents were collected from fish and subjected to high throughput 16S rRNA sequencing, to accurately determine the composition of the intestinal microbiome. The predominant phyla identified from both groups were Tenericutes, Firmicutes, Proteobacteria, Spirochaetae and Bacteroidetes...
November 8, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27859556/effect-of-nanosilver-on-cortisol-release-and-morphometrics-in-rainbow-trout-oncorhynchus-mykiss
#18
Laura Murray, Michael D Rennie, Eva C Enders, Kerri Pleskach, Jonathan D Martin
Nanosilver (nAg) is a nanoparticle commonly incorporated into consumer products for its antimicrobial properties that has been detected in aquatic environments. Toxic effects of nAg on fish have been observed and may induce a stress response in fish in the form of increased blood plasma cortisol. In this study, effects of nAg exposure on Rainbow Trout (Oncorhynchus mykiss) were investigated over a 28 d period using blood plasma cortisol concentrations as an indicator of stress. Several morphometric measures (growth, Fulton's condition factor, and hepatosomatic index or HSI) were also taken during the experiment to investigate potential whole-body effects of exposure, and concentrations of nAg in fish muscle tissue were measured...
November 17, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27859168/sea-louse-parasites-on-juvenile-wild-salmon-in-the-broughton-archipelago-british%C3%A2-columbia-canada
#19
Stephanie J Peacock, Andrew W Bateman, Martin Krkošek, Brendan Connors, Scott Rogers, Lauren Portner, Zephyr Polk, Coady Webb, Alexandra Morton
The global expansion of aquaculture has changed the structure of fish populations in coastal environments, with implications for disease dynamics. In Pacific Canada, farmed salmon act as reservoir hosts for parasites and pathogens, including sea lice (Lepeophtheirus salmonis and Caligus clemensi) that can transmit to migrating wild salmon. Assessing the impact of salmon farms on wild salmon requires regular monitoring of sea-louse infections on both farmed and wild fish. Since 2001, we have collected juvenile pink (Oncorhynchus gorbuscha) and chum (O...
July 2016: Ecology
https://www.readbyqxmd.com/read/27859107/regional-diversity-reverses-the-negative-impacts-of-an-alien-predator-on-local-species-poor-communities
#20
Charlie J G Loewen, Rolf D Vinebrooke
Species diversity is often an implicit source of biological insurance for communities against the impacts of novel perturbations, such as the introduction of an invasive species. High environmental heterogeneity (e.g., a mountainous gradient) is expected to beget greater regional species diversity and variation in functional traits related to environmental tolerances. Thus, heterogeneous metacommunities are expected to provide more tolerant colonists that buffer stressed local communities in the absence of dispersal limitation...
October 2016: Ecology
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