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https://www.readbyqxmd.com/read/28337034/exposure-to-an-acute-hypoxic-stimulus-during-early-life-affects-the-expression-of-glucose-metabolism-related-genes-at-first-feeding-in-trout
#1
Jingwei Liu, Elisabeth Plagnes-Juan, Inge Geurden, Stéphane Panserat, Lucie Marandel
Rainbow trout (Oncorhynchus mykiss) is considered a "glucose-intolerant" species. With the aim of programming trout to improve their metabolic use of dietary carbohydrates, we hypothesised that a hypoxic stimulus applied during embryogenesis could later affect glucose metabolism at the first-feeding stage. An acute hypoxic stimulus (2.5 or 5.0 mg·L(-1) O2) was applied for 24 h to non-hatched embryos or early hatched alevins followed by a challenge test with a high carbohydrate diet at first-feeding. The effectiveness of the early hypoxic stimulus was confirmed by the induction of oxygen-sensitive markers such as egln3...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28330807/dietary-myrtle-myrtus-communis-l-improved-non-specific-immune-parameters-and-bactericidal-activity-of-skin-mucus-in-rainbow-trout-oncorhynchus-mykiss-fingerlings
#2
Hadis Mansouri Taee, Abdolmajid Hajimoradloo, Seyed Hossein Hoseinifar, Hassan Ahmadvand
The present study examined the effects of dietary Myrtle (Myrtus communis L.) on non-specific immune parameters and bactericidal activity of skin mucus in rainbow trout (Oncorhynchus mykiss) fingerlings. Three hundred and sixty fingerlings (6.50 ± 0.55 g (were distributed in twelve cages (65 × 65 × 65 cm) with a metal framework. The study included four treatments repeated in triplicates. The treatments were feeding trouts with experimental diets containing different levels (0, 0.5, 1 and 1.5%) of Myrtle powder...
March 19, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28324676/comparison-of-selected-nonlethal-samples-from-adult-steelhead-for-detection-of-infectious-hematopoietic-necrosis-virus-using-cell-culture
#3
David R Burbank, Tyson R Fehringer, Luciano V Chiaramonte
Nonlethal sampling techniques have previously been evaluated for detection of a variety of viral salmonid pathogens. However, many of these studies have used molecular assays in lieu of widely accepted cell culture techniques to evaluate the sampled tissues. Samples were collected from female steelhead Oncorhynchus mykiss broodstock using three potential nonlethal sampling methods (mucus/skin scrape, pectoral fin clip, and gill tissue biopsy) and evaluated for the presence of infectious hematopoietic necrosis virus (IHNV) via cell culture techniques...
June 2017: Journal of Aquatic Animal Health
https://www.readbyqxmd.com/read/28323891/characterization-of-baff-and-april-subfamily-receptors-in-rainbow-trout-oncorhynchus-mykiss-potential-role-of-the-baff-april-axis-in-the-pathogenesis-of-proliferative-kidney-disease
#4
Aitor G Granja, Jason W Holland, Jaime Pignatelli, Christopher J Secombes, Carolina Tafalla
Proliferative kidney disease (PKD) is a parasitic infection of salmonid fish characterized by hyper-secretion of immunoglobulins in response to the presence of the myxozoan parasite, Tetracapsuloides bryosalmonae. In this context, we hypothesized that the BAFF/APRIL axis, known to play a major role in B cell differentiation and survival in mammals, could be affected by the parasite and consequently be involved in the apparent shift in normal B cell activity. To regulate B cell activity, BAFF and APRIL bind to transmembrane activator and calcium modulator and cyclophilin ligand interactor (TACI) and B cell maturation antigen (BCMA), whereas BAFF also binds to BAFF receptor (BAFF-R)...
2017: PloS One
https://www.readbyqxmd.com/read/28302378/hypothermic-storage-of-isolated-spermatogonia-and-oogonia-from-rainbow-trout-oncorhynchus-mykiss
#5
Bahram Falahatkar, Samaneh Poursaeid, Ryota Kitada, Goro Yoshizaki
A growing number of fish species are endangered due to human activities. A short- or long-time preservation of gametes could conserve genetic resources of threatened fish species. The aim of this study was to evaluate a hypothermic condition for short-term preservation of spermatogonia and oogonia cells isolated from immature transgenic rainbow trout, Oncorhynchus mykiss, and to determine the maximum time point for further transplantation. Viability rate of germ cells was investigated after isolation and during storage at 4 °C up to 24 h...
March 13, 2017: Cryobiology
https://www.readbyqxmd.com/read/28296895/evaluating-signals-of-oil-spill-impacts-climate-and-species-interactions-in-pacific-herring-and-pacific-salmon-populations-in-prince-william-sound-and-copper-river-alaska
#6
Eric J Ward, Milo Adkison, Jessica Couture, Sherri C Dressel, Michael A Litzow, Steve Moffitt, Tammy Hoem Neher, John Trochta, Rich Brenner
The Exxon Valdez oil spill occurred in March 1989 in Prince William Sound, Alaska, and was one of the worst environmental disasters on record in the United States. Despite long-term data collection over the nearly three decades since the spill, tremendous uncertainty remains as to how significantly the spill affected fishery resources. Pacific herring (Clupea pallasii) and some wild Pacific salmon populations (Oncorhynchus spp.) in Prince William Sound declined in the early 1990s, and have not returned to the population sizes observed in the 1980s...
2017: PloS One
https://www.readbyqxmd.com/read/28293860/tissue-specific-daily-variation-in-the-oxidative-status-of-sturgeon-acipenser-naccarii-and-rainbow-trout-oncorhynchus-mykiss-a-comparative-study
#7
M C Hidalgo, C E Trenzado, M Furné, A Beltrán, C Manzaneda, M García-Gallego, A Domezain, A Sanz
The oxidative status is associated with animal lifespan, metabolism, activity and circadian rhythms. The objective of this work is to study the time course of the oxidative status over a daily cycle in the plasma, liver and brain, and the changes in the plasma cortisol levels of sturgeon and trout. The knowledge of daily oxidative status will provide a better understanding of the trout and sturgeon physiology and adequate maintenance and food supply of farmed fish in relation to photoperiod. Superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione transferase, DT-diaphorase activities, lipid peroxidation and cortisol were measured...
March 14, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28291603/proliferative-kidney-disease-in-rainbow-trout-oncorhynchus-mykiss-under-intensive-breeding-conditions-pathogenesis-and-haematological-and-immune-parameters
#8
Miroslava Palikova, Ivana Papezikova, Zdenka Markova, Stanislav Navratil, Jan Mares, Lukas Mares, Libor Vojtek, Pavel Hyrsl, Eva Jelinkova, Heike Schmidt-Posthaus
Proliferative kidney disease (PKD) is an endoparasitic disease of salmonid fish caused by Tetracapsuloides bryosalmonae (Myxozoa: Malacosporea). This study presents a comprehensive view on PKD development in rainbow trout (Oncorhynchus mykiss) reared at an intensive fish breeding facility, with focus on mortality, pathology/histopathology, haematological findings and immune functions. Diseased and reference fish were sampled monthly and time course of natural infection was followed up from the onset of clinical signs (September 2014) to full recovery (January 2015)...
March 6, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28286256/effect-of-dietary-%C3%AE-glucan-on-growth-survival-and-regulation-of-immune-processes-in-rainbow-trout-oncorhynchus-mykiss-infected-by-aeromonas-salmonicida
#9
Liqin Ji, Guoxiang Sun, Jun Li, Yi Wang, Yishuai Du, Xian Li, Ying Liu
The present study evaluated the effects of dietary β-glucan (0, 0.05%, 0.1%, and 0.2%) on growth performance after 42 days of feeding. Thereafter, rainbow trout (Oncorhynchus mykiss) were infected with Aeromonas salmonicida, and survival rates as well as the regulating processes of stress- and immune-related factors were analyzed. In general, higher dietary β-glucan levels obviously improved specific growth rate (SGR), weight gain (WG) and feed efficiency (FE) (P ≤ 0.05). Survival rates in β-glucan groups increased significantly compared with the control group after A...
March 7, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28285182/preliminary-study-of-an-oral-vaccine-against-infectious-hematopoietic-necrosis-virus-using-improved-yeast-surface-display-technology
#10
Jing-Zhuang Zhao, Li-Ming Xu, Miao Liu, Yong-Sheng Cao, Scott E LaPatra, Jia-Sheng Yin, Hong-Bai Liu, Tong-Yan Lu
Infectious hematopoietic necrosis virus (IHNV) is a common pathogen that causes severe disease in the salmonid aquaculture industry. Because oral vaccines induce more efficient mucosal immunity than parenteral immunization, an oral vaccine was developed with an improved yeast cell surface display technology to induce an immune response to IHNV. The oral yeast vaccine, designated EBY100/pYD1-bi-G, was delivered orally to rainbow trout (Oncorhynchus mykiss) on days 1 and 32, and the nonspecific and specific immune responses were measured 50days after the first vaccination...
March 8, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28284613/genetic-and-serological-diversity-of-flavobacterium-psychrophilum-isolates-from-salmonids-in-united-kingdom
#11
Thao P H Ngo, Kerry L Bartie, Kim D Thompson, David W Verner-Jeffreys, Rowena Hoare, Alexandra Adams
Flavobacterium psychrophilum is one of the most important bacterial pathogens affecting cultured rainbow trout (Oncorhynchus mykiss) and is increasingly causing problems in Atlantic salmon (Salmo salar L.) hatcheries. Little is known about the heterogeneity of F. psychrophilum isolates on UK salmonid farms. A total of 315 F. psychrophilum isolates, 293 of which were collected from 27 sites within the UK, were characterised using four genotyping methods and a serotyping scheme. A high strain diversity was identified among the isolates with 54 pulsotypes, ten (GTG)5-PCR types, two 16S rRNA allele lineages, seven plasmid profiles and three serotypes...
March 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28266283/biochemical-histopathologic-physiologic-and-behavioral-effects-of-nonsteroidal-antiinflammatory-drugs-in-rainbow-trout-oncorhynchus-mykiss
#12
Amy L Rizzo Gregory A Wooster Luce E Guanzini Christine M Peterson Karryssa S Fenderson Hollis N Erb Paul R Bowser And Mary E Martin
Because the number of fish being used in research is increasing rapidly, evaluating the analgesic and pathologic effects of NSAIDin fish is essential. To determine the biochemical, histopathologic, physiologic and behavioral effects of 3 NSAID, 48 rainbow trout underwent anesthesia with tricaine methanesulfonate and exploratory celiotomy and were randomly assigned to receive flunixin(0.5 mg/kg IM), ketorolac (0.5 mg/kg IM), ketoprofen (2 mg/kg IM), or saline. Clinical pathologic variables were assessed 1 wk before surgery and 48 h after surgery...
March 6, 2017: Comparative Medicine
https://www.readbyqxmd.com/read/28265514/an-extremely-sensitive-nested-pcr-rflp-mitochondrial-marker-for-detection-and-identification-of-salmonids-in-edna-from-water-samples
#13
Laura Clusa, Alba Ardura, Sara Fernández, Agustín A Roca, Eva García-Vázquez
BACKGROUND: Salmonids are native from the North Hemisphere but have been introduced for aquaculture and sport fishing in the South Hemisphere and inhabit most rivers and lakes in temperate and cold regions worldwide. Five species are included in the Global Invasive Species Database: rainbow trout Oncorhynchus mykiss, Atlantic salmon Salmo salar, brown trout Salmo trutta, brook trout Salvelinus fontinalis, and lake trout Salvelinus namaycush. In contrast, other salmonids are endangered in their native settings...
2017: PeerJ
https://www.readbyqxmd.com/read/28256031/microbiome-dynamic-modulation-through-functional-diets-based-on-pre-and-probiotics-mannan-oligosaccharides-and-saccharomyces-cerevisiae-in-juvenile-rainbow-trout-oncorhynchus-mykiss
#14
Ana Teresa Gonçalves, Cristian Gallardo-Escárate
AIMS: This study used high-throughput sequencing to evaluate the intestinal microbiome dynamics in rainbow trout (Oncorhynchus mykiss) fed commercial diets supplemented with either pre- or probiotics (0.6% mannan-oligosaccharides and 0.5% Saccharomyces cerevisiae respectively) or the mixture of both. METHODS AND RESULTS: A total of 57 fish whole intestinal mucosa and contents bacterial communities were characterized by high-throughput sequencing and analysis of the V3-V4 region of the 16S rRNA gene, as well as the relationship between plasma biochemical health indicators and microbiome diversity...
March 3, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28252803/effects-of-atrazine-and-chlorothalonil-on-the-reproductive-success-development-and-growth-of-early-life-stage-sockeye-salmon-oncorhynchus-nerka
#15
Lindsay M Du Gas, Peter S Ross, Janessa Walker, Vicki L Marlatt, Christopher J Kennedy
The effects of 2 currently used commercial pesticide formulations on Pacific sockeye salmon (Oncorhynchus nerka), from fertilization to emergence, were evaluated in a gravel-bed flume incubator that simulated a natural streambed. Embryos were exposed to atrazine at 25 µg/L (low atrazine) or atrazine at 250 µg/L (high atrazine) active ingredient (a.i.), and chlorothalonil at 0.5 µg/L (low chlorothalonil) or chlorothalonil at 5 µg/L a.i. (high chlorothalonil) and examined for effects on developmental success and timing, as well as physical and biochemical growth parameters...
March 2, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28251411/a-fish-intestinal-epithelial-barrier-model-established-from-the-rainbow-trout-oncorhynchus-mykiss-cell-line-rtgutgc
#16
Matteo Minghetti, Carolin Drieschner, Nadine Bramaz, Hannah Schug, Kristin Schirmer
The intestine of fish is a multifunctional organ: lined by only a single layer of specialized epithelial cells, it has various physiological roles including nutrient absorption and ion regulation. It moreover comprises an important barrier for environmental toxicants, including metals. Thus far, knowledge of the fish intestine is limited largely to in vivo or ex vivo investigations. Recently, however, the first fish intestinal cell line, RTgutGC, was established, originating from a rainbow trout (Oncorhynchus mykiss)...
March 1, 2017: Cell Biology and Toxicology
https://www.readbyqxmd.com/read/28251344/effects-of-habitat-features-on-size-biased-predation-on-salmon-by-bears
#17
Luke C Andersson, John D Reynolds
Predators can drive trait divergence among populations of prey by imposing differential selection on prey traits. Habitat characteristics can mediate predator selectivity by providing refuge for prey. We quantified the effects of stream characteristics on biases in the sizes of spawning salmon caught by bears (Ursus arctos and U. americanus) on the central coast of British Columbia, Canada by measuring size-biased predation on spawning chum (Oncorhynchus keta) and pink (O. gorbuscha) salmon in 12 streams with varying habitat characteristics...
March 1, 2017: Oecologia
https://www.readbyqxmd.com/read/28249227/effects-of-food-borne-exposure-of-juvenile-rainbow-trout-oncorhynchus-mykiss-to-emerging-brominated-flame-retardants-1-2-bis-2-4-6-tribromophenoxy-ethane-and-2-ethylhexyl-2-3-4-5-tetrabromobenzoate
#18
Maeva Giraudo, Mélanie Douville, Robert J Letcher, Magali Houde
Brominated flame retardants (BFRs) represent a large group of chemicals used in a variety of household and commercial products to prevent fire propagation. The environmental persistence and toxicity of some of the most widely used BFRs has resulted in a progressive ban worldwide and the development of novel BFRs for which the knowledge on environmental health impacts remains limited. The objectives of this study were to evaluate the effects of two emerging BFRs, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) and 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EH-TBB), in diet exposed juvenile rainbow trout (Oncorhynchus mykiss)...
February 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28248995/the-influence-of-sulfur-and-hair-growth-on-stable-isotope-diet-estimates-for-grizzly-bears
#19
Garth Mowat, P Jeff Curtis, Diana J R Lafferty
Stable isotope ratios of grizzly bear (Ursus arctos) guard hair collected from bears on the lower Stikine River, British Columbia (BC) were analyzed to: 1) test whether measuring δ34S values improved the precision of the salmon (Oncorhynchus spp.) diet fraction estimate relative to δ15N as is conventionally done, 2) investigate whether measuring δ34S values improves the separation of diet contributions of moose (Alces alces), marmot (Marmota caligata), and mountain goat (Oreamnos americanus) and, 3) examine the relationship between collection date and length of hair and stable isotope values...
2017: PloS One
https://www.readbyqxmd.com/read/28245850/interaction-of-silver-nanoparticles-with-algae-and-fish-cells-a-side-by-side-comparison
#20
Yang Yue, Xiaomei Li, Laura Sigg, Marc J-F Suter, Smitha Pillai, Renata Behra, Kristin Schirmer
BACKGROUND: Silver nanoparticles (AgNP) are widely applied and can, upon use, be released into the aquatic environment. This raises concerns about potential impacts of AgNP on aquatic organisms. We here present a side by side comparison of the interaction of AgNP with two contrasting cell types: algal cells, using the algae Euglena gracilis as model, and fish cells, a cell line originating from rainbow trout (Oncorhynchus mykiss) gill (RTgill-W1). The comparison is based on the AgNP behavior in exposure media, toxicity, uptake and interaction with proteins...
February 28, 2017: Journal of Nanobiotechnology
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