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oncorhynchus mykiss

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https://www.readbyqxmd.com/read/28105714/gyrodactylus-salmonis-infection-impairs-the-olfactory-system-of-rainbow-trout
#1
E Lari, G G Pyle
Monogenean worms are ectoparasites that are known to be infectious to a wide variety of fish. Few species of monogenean parasites have been reported in the olfactory chamber of fish in current peer-reviewed literature. However, the impacts of these parasites on the olfactory system are not well understood. In this study, the effects of Gyrodactylus salmonis on the olfactory system structure and performance were investigated in rainbow trout (Oncorhynchus mykiss). The olfactory performance of the infected fish was examined using an electro-olfactography (EOG) technique, while the ultrastructure of the olfactory rosette was studied using scanning electron microscopy (SEM) and light microscopy (LM)...
January 20, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28088362/molecular-characterization-of-a-novel-orthomyxovirus-from-rainbow-and-steelhead-trout-oncorhynchus-mykiss
#2
William N Batts, Scott E LaPatra, Ryan Katona, Eric Leis, Terry Fei Fan Ng, Marine S O Brieuc, Rachel B Breyta, Maureen K Purcell, Carla M Conway, Thomas B Waltzek, Eric Delwart, James R Winton
A novel virus, rainbow trout orthomyxovirus (RbtOV), was isolated in 1997 and again in 2000 from commercially-reared rainbow trout (Oncorhynchus mykiss) in Idaho, USA. The virus grew optimally in the CHSE-214 cell line at 15°C producing a diffuse cytopathic effect; however, juvenile rainbow trout exposed to cell culture-grown virus showed no mortality or gross pathology. Electron microscopy of preparations from infected cell cultures revealed the presence of typical orthomyxovirus particles. The complete genome of RbtOV is comprised of eight linear segments of single-stranded, negative-sense RNA having highly conserved 5' and 3'-terminal nucleotide sequences...
January 11, 2017: Virus Research
https://www.readbyqxmd.com/read/28088353/expansion-and-differentiation-of-igm-b-cells-in-the-rainbow-trout-peritoneal-cavity-in-response-to-different-antigens
#3
Rosario Castro, Beatriz Abós, Lucia González, Aitor G Granja, Carolina Tafalla
To date, intraperitoneal (i.p.) injection seems to be the most effective vaccination route in aquaculture, as many i.p. administered fish vaccines are capable of conferring strong and long-lasting immune responses. Despite this, how peritoneal leukocytes are regulated upon antigen encounter has only been scarcely studied in fish. Although, in the past, myeloid cells were thought to be the main responders to peritoneal inflammation, a recent study revealed that IgM(+) B cells are one of the main cell types in the teleost peritoneal cavity in response to pathogenic bacteria...
January 11, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28074223/characterization-and-mechanism-of-anti-aeromonas-salmonicida-activity-of-a-marine-probiotic-strain-bacillus-velezensis-v4
#4
Xi-Yan Gao, Ying Liu, Li-Li Miao, Er-Wei Li, Guo-Xiang Sun, Ying Liu, Zhi-Pei Liu
The bacterium Aeromonas salmonicida is the causative agent of furunculosis, a systemic, ubiquitous disease of fish in the salmon family, characterized by high mortality and morbidity. Probiotics are a promising approach for prevention of furunculosis in aquaculture. A bacterial strain with anti-A. salmonicida properties, Bacillus velezensis V4, was isolated and the mechanisms underlying these properties were investigated. Anti-A. salmonicida compounds present in cell-free supernatant of V4 were purified and structurally identified as members of the iturin, macrolactin, and difficidin groups...
January 10, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28067297/regulation-of-fads2-transcription-by-srebp-1-and-ppar-%C3%AE-influences-lc-pufa-biosynthesis-in-fish
#5
Xiaojing Dong, Peng Tan, Zuonan Cai, Hanlin Xu, Jingqi Li, Wei Ren, Houguo Xu, Rantao Zuo, Jianfeng Zhou, Kangsen Mai, Qinghui Ai
The present study was conducted to explore the mechanisms leading to differences among fishes in the ability to biosynthesize long-chain polyunsaturated fatty acids (LC-PUFAs). Replacement of fish oil with vegetable oil caused varied degrees of increase in 18-carbon fatty acid content and decrease in n-3 LC-PUFA content in the muscle and liver of rainbow trout (Oncorhynchus mykiss), Japanese seabass (Lateolabrax japonicus) and large yellow croaker (Larimichthys crocea), suggesting that these fishes have differing abilities to biosynthesize LC-PUFAs...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28062226/molecular-characterization-and-expression-analysis-of-three-subclasses-of-igt-in-rainbow-trout-oncorhynchus-mykiss
#6
Nu Zhang, Xu-Jie Zhang, Dan-Dan Chen, J Oriol Sunyer, Yong-An Zhang
As the teleost specific immunoglobulin, IgT plays important roles in systemic and mucosal immunity. In the current study, in rainbow trout, we have cloned the heavy chain (Igτ) genes of a secretory form of IgT2 as well as the membrane and secretory forms of a third IgT subclass, termed IgT3. Conserved cysteine and tryptophan residues that are crucial for the folding of the immunoglobulin domain as well as hydrophobic and hydrophilic residues within CART motif were identified in all IgT subclasses. Through analysis of the rainbow trout genome assembly, Igτ3 gene was found localized upstream of Igτ1 gene, while Igτ2 gene situated on another scaffold...
January 3, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28040062/influences-of-dietary-omega-3-fatty-acids-on-haematologic-and-immunologic-changes-in-rainbow-trout-milked-regularly
#7
M E Yonar, K Koprucu
In this study, it was examined the effects of dietary omega-3 fatty acids on the haematocrit (Ht), haemoglobin (Hb), mean corpuscular haemoglobin (MCH), total protein (TP) and total immunoglobulin (TI) values, erythrocyte (RBC) and leucocyte (WBC) counts, mean corpuscular volume (MCV), mean corpuscular haemoglobin concentration (MCHC), phagocytic index (PI) and nitroblue tetrazolium (NBT) activity in rainbow trout (Oncorhynchus mykiss) milked regularly. For this aim, one control and two experimental diets were prepared as isonitrogenous and isocaloric...
November 30, 2016: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28035235/ancestry-and-adaptive-evolution-of-anadromous-resident-and-adfluvial-rainbow-trout-oncorhynchus-mykiss-in-the-san-francisco-bay-area-application-of-adaptive-genomic-variation-to-conservation-in-a-highly-impacted-landscape
#8
Maeva Leitwein, John Carlos Garza, Devon E Pearse
The streams draining of into San Francisco Bay, California, have been impacted by habitat alteration for over 150 years, and roads, dams, water diversions, and other impediments now block the paths of many aquatic migratory species. These changes can affect the genetic structure of fish populations, as well as driving adaptive evolution to novel environmental conditions. Here, we determine the evolutionary relationships of San Francisco Bay Area steelhead/rainbow trout (Oncorhynchus mykiss) populations and show that (i) they are more closely related to native coastal steelhead than to the California Central Valley lineage, with no evidence of introgression by domesticated hatchery rainbow trout, (ii) populations above and below barriers within watersheds are each other's closest relatives, and (iii) adaptive genomic variation associated with migratory life-history traits in O...
January 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28027983/effect-of-ammonia-n-and-pathogen-challenge-on-complement-component-8%C3%AE-and-8%C3%AE-expression-in-the-darkbarbel-catfish-pelteobagrus-vachellii
#9
Chuanjie Qin, Ting Shao, Daxian Zhao, Huiguo Duan, Zhengyong Wen, Dengyue Yuan, Huatao Li, Zemin Qi
The complement components C8α and C8β mediate the formation of the membrane attack complex (MAC) to resist pathogenic bacteria and play important roles in innate immunity. Full-length complement C8α (Pv-C8α) and C8β (Pv-C8β) cDNA were identified in the darkbarbel catfish Pelteobagrus vachellii, and their mRNA expression levels were analyzed after ammonia-N and pathogen treatment. The Pv-C8α gene contained 1983 bp, including a 1794-bp open reading frame (ORF) encoding 598 amino acids. The Pv-C8β gene contained 1952 bp, including a 1761-bp ORF encoding 587 amino acids...
December 24, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28025160/characterisation-of-arginase-paralogues-in-salmonids-and-their-modulation-by-immune-stimulation-infection
#10
Ottavia Benedicenti, Tiehui Wang, Eakapol Wangkahart, Douglas J Milne, Jason W Holland, Catherine Collins, Christopher J Secombes
In this study we show that four arginase isoforms (arg1a, arg1b, arg2a, arg2b) exist in rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). We have characterised these molecules in terms of a) sequence analysis, b) constitutive expression in different tissues, and modulated expression following c) stimulation of head kidney macrophages in vitro, or d) vaccination/infection with Yersinia ruckeri and e) parasite infection (AGD caused by Paramoeba perurans and PKD caused by Tetracapsuloides bryosalmonae)...
December 23, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28000914/inclusion-of-hermetia-illucens-larvae-meal-on-rainbow-trout-oncorhynchus-mykiss-feed-effect-on-sensory-profile-according-to-static-and-dynamic-evaluations
#11
Monica Borgogno, Caterina Dinnella, Valeria Iaconisi, Renzo Fusi, Claudia Scarpaleggia, Achille Schiavone, Erminio Monteleone, Laura Gasco, Giuliana Parisi
BACKGROUND: Diet implementation with insect meal arouses increased attention in aquaculture considering the advantages of this new protein source. The effect of Hermetia illucens meal (HI) inclusion in diets on rainbow trout physical-chemical and sensory properties was evaluated. Three diets were prepared: HI0, HI25, HI50, with 0, 25 and 50% of HI replacing fish meal, respectively. Fillet sensory profiles were described by descriptive analysis (DA) and Temporal Dominance of Sensation (TDS) methods...
December 21, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27986793/a-snp-based-linkage-map-of-the-arctic-charr-salvelinus-alpinus-genome-provides-insights-into-the-diploidization-process-after-whole-genome-duplication
#12
Cameron M Nugent, Anne A Easton, Joseph D Norman, Moira M Ferguson, Roy G Danzmann
Diploidization, which follows whole genome duplication events, does not occur evenly across the genome. In salmonid fishes, certain pairs of homeologous chromosomes preserve tetraploid loci in higher frequencies towards the telomeres due to residual tetrasomic inheritance. Research suggests this occurs only in homeologous pairs where one chromosome arm has undergone a fusion event. We present a linkage map for Arctic charr (Salvelinus alpinus), a salmonid species with relatively fewer chromosome fusions. Genotype by sequencing identified 19,418 SNPs and a linkage map consisting of 4508 markers was constructed from a subset of high quality SNPs and microsatellite markers that were used to anchor the new map to previous versions...
December 16, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27973770/effects-on-biotransformation-oxidative-stress-and-endocrine-disruption-in-rainbow-trout-oncorhynchus-mykiss-exposed-to-hydraulic-fracturing-flowback-and-produced-water
#13
Yuhe He, Erik J Folkerts, Yifeng Zhang, Jonathan W Martin, Daniel S Alessi, Greg G Goss
The effects of hydraulic fracturing (HF) flowback and produced water (HF-FPW), a complex saline mixture of injected HF fluids and deep formation water that return to the surface, was examined in rainbow trout (Oncorhynchus mykiss). Exposure to HF-FPWs resulted in significant induction of ethoxyresorufin-O-deethylase (EROD) activity in both liver and gill tissues. Increased lipid peroxidation via oxidative stress was also detected by thiobarbituric acid reactive substances (TBARS) assay. The mRNA expressions of a battery of genes related to biotransformation, oxidative stress, and endocrine disruption were also measured using quantitative real-time polymerase chain reaction (Q-RT-PCR)...
December 27, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27966609/symbiont-derived-sphingolipids-modulate-mucosal-homeostasis-and-b-cells-in-teleost-fish
#14
Ali Sepahi, Héctor Cordero, Howard Goldfine, Maria Ángeles Esteban, Irene Salinas
Symbiotic bacteria and mucosal immunoglobulins have co-evolved for millions of years in vertebrate animals. Symbiotic bacteria products are known to modulate different aspects of the host immune system. We recently reported that Flectobacillus major is a predominant species that lives in the gill and skin mucosal surfaces of rainbow trout (Oncorhynchus mykiss). F. major is known to produce sphingolipids of a unique molecular structure. Here we propose a role for F. major and its sphingolipids in the regulation of B cell populations in rainbow trout, as well as an essential role for sphingolipids in trout mucosal homeostasis...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27957333/high-thermal-tolerance-of-a-rainbow-trout-population-near-its-southern-range-limit-suggests-local-thermal-adjustment
#15
Christine E Verhille, Karl K English, Dennis E Cocherell, Anthony P Farrell, Nann A Fangue
Transformation of earth's ecosystems by anthropogenic climate change is predicted for the 21st century. In many regions, the associated increase in environmental temperatures and reduced precipitation will have direct effects on the physiological performance of terrestrial and aquatic ectotherms and have already threatened fish biodiversity and important fisheries. The threat of elevated environmental temperatures is particularly salient for members of the Oncorhynchus genus living in California, which is the southern limit of their range...
2016: Conservation Physiology
https://www.readbyqxmd.com/read/27943344/becoming-a-better-swimmer-structural-complexity-enhances-agility-in-a-captive-reared-fish
#16
I Ahlbeck Bergendahl, S Miller, C Depasquale, L Giralico, V A Braithwaite
To test whether swimming skills can be improved by exposure to structurally complex environments, juvenile rainbow trout Oncorhynchus mykiss were reared in either physically enriched or plain tanks for 2 months and were then screened to test their ability to swim along a channel while avoiding obstructions. The results show that even a relatively short exposure period to enrichment improves O. mykiss swimming agility.
December 12, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27934284/which-molecular-features-affect-the-intrinsic-hepatic-clearance-rate-of-ionizable-organic-chemicals-in-fish
#17
Yi Chen, Joop L M Hermens, Michiel T O Jonker, Jon A Arnot, James M Armitage, Trevor Brown, John W Nichols, Kellie A Fay, Steven T J Droge
Greater knowledge of biotransformation rates for ionizable organic compounds (IOCs) in fish is required to properly assess the bioaccumulation potential of many environmentally relevant contaminants. In this study, we measured in vitro hepatic clearance rates for 50 IOCs using a pooled batch of liver S9 fractions isolated from rainbow trout (Oncorhynchus mykiss). The IOCs included four types of strongly ionized acids (carboxylates, phenolates, sulfonates, and sulfates), three types of strongly ionized bases (primary, secondary, tertiary amines), and a pair of quaternary ammonium compounds (QACs)...
December 6, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27927243/traditional-mapuche-ecological-knowledge-in-patagonia-argentina-fishes-and-other-living-beings-inhabiting-continental-waters-as-a-reflection-of-processes-of-change
#18
Juana Aigo, Ana Ladio
BACKGROUND: Understanding how people interpret environmental change and develop practices in response to such change is essential to comprehend human resource use. In the cosmology of the American indigenous peoples, as among the Mapuche people, freshwater systems are considered a living entity, where animals have an enormous role to play in the universe of meaning. However, human adaptive responses to freshwater system dynamics are scarcely examined. In this work a survey is carried out in three Mapuche communities of Argentine Patagonia to assess their traditional knowledge of the fishes and other non-human living beings that inhabit lakes and rivers...
December 7, 2016: Journal of Ethnobiology and Ethnomedicine
https://www.readbyqxmd.com/read/27923746/aeromonas-salmonicida-type-iii-secretion-system-effectors-mediated-immune-suppression-in-rainbow-trout-oncorhynchus-mykiss
#19
F C Origgi, O Benedicenti, H Segner, U Sattler, T Wahli, J Frey
Aeromonas salmonicida subsp. salmonicida, the etiologic agent of furunculosis, is a major pathogen in aquaculture. Together with other pathogens, it is characterized by the presence of a type 3 secretion system (T3SS). The T3SS is the main virulence mechanism of A. salmonicida. It is used by the bacterium to secrete and translocate several toxins and effector proteins into the host cell. Some of these factors have a detrimental impact on the integrity of the cell cytoskeleton, likely contributing to impair phagocytosis...
December 5, 2016: Fish & Shellfish Immunology
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
#20
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
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