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https://www.readbyqxmd.com/read/28627494/first-record-of-proliferative-kidney-disease-agent-tetracapsuloides-bryosalmonae-in-wild-brown-trout-and-european-grayling-in-finland
#1
Anti Vasemägi, Ilkka Nousiainen, Ari Saura, Juha-Pekka Vähä, Jorma Valjus, Ari Huusko
The myxozoan endoparasite Tetracapsuloides bryosalmonae causes temperature-driven proliferative kidney disease (PKD) in salmonid fishes. Despite the economic and ecological importance of PKD, information about the distribution of the parasite is still scarce. Here, we report for the first time the occurrence of T. bryosalmonae in wild brown trout Salmo trutta and European grayling Thymallus thymallus populations in Finland. We detected T. bryosalmonae at high prevalence in both brown trout and European grayling from the transboundary Finnish-Russian River Koutajoki system (Rivers Oulankajoki, Kuusinkijoki, Kitkajoki, Maaninkajoki, and Juumajoki) in north-eastern Finland...
June 19, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28626905/genome-architecture-enables-local-adaptation-of-atlantic-cod-despite-high-connectivity
#2
Julia M I Barth, Paul R Berg, Per R Jonsson, Sara Bonanomi, Hanna Corell, Jakob Hemmer-Hansen, Kjetill S Jakobsen, Kerstin Johannesson, Per Erik Jorde, Halvor Knutsen, Per-Olav Moksnes, Bastiaan Star, Nils Chr Stenseth, Henrik Svedäng, Sissel Jentoft, Carl André
Adaptation to local conditions is a fundamental process in evolution; however, mechanisms maintaining local adaptation despite high gene flow are still poorly understood. Marine ecosystems provide a wide array of diverse habitats that frequently promote ecological adaptation even in species characterized by strong levels of gene flow. As one example, populations of the marine fish Atlantic cod (Gadus morhua) are highly connected due to immense dispersal capabilities but nevertheless show local adaptation in several key traits...
June 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28624468/fish-mass-immunization-against-virus-with-recombinant-spiny-bacterins
#3
Julio Coll
Bacterins obtained from recombinant bacteria displaying heterologous antigens in its surface coded by prokaryotic rather than eukaryotic expression plasmids (here called "spiny" bacterins or spinycterins), have been used to increase fish immunogenicity of recombinant viral protein fragments. To explore their immunogenicity, five bacterial-specific membrane anchor-motifs characterized in the literature (Nmistic, Mistic, NTD, YAIN and YBEL) were genetically fused to the immunorelevant cystein-free 117 amino acid fragment II from the ORF149 of cyprinid herpes virus 3 (frgIICyHV3)...
June 15, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28622660/assessing-the-effects-of-the-antidepressant-venlafaxine-to-fathead-minnows-exposed-to-environmentally-relevant-concentrations-over-a-full-life-cycle
#4
Joanne L Parrott, Chris D Metcalfe
Venlafaxine is an antidepressant drug that has been detected in municipal wastewater effluents at low μg/L concentrations. To assess the potential of this compound to affect the survival, development and reproductive capacity of fish, we exposed fathead minnow (Pimephales promelas) over a full lifecycle in a flow-through system to nominal venlafaxine concentrations of 0.88, 8.8, and 88 μg/L. Mean measured venlafaxine concentrations in these treatments were 1.0, 9.3 and 75 μg/L. During the 167-168 d exposure, no significant changes were observed in survival, or the weights and lengths of fathead minnows...
June 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28616062/severe-consequences-of-habitat-fragmentation-on-genetic-diversity-of-an-endangered-australian-freshwater-fish-a-call-for-assisted-gene-flow
#5
Alexandra Pavlova, Luciano B Beheregaray, Rhys Coleman, Dean Gilligan, Katherine A Harrisson, Brett A Ingram, Joanne Kearns, Annika M Lamb, Mark Lintermans, Jarod Lyon, Thuy T T Nguyen, Minami Sasaki, Zeb Tonkin, Jian D L Yen, Paul Sunnucks
Genetic diversity underpins the ability of populations to persist and adapt to environmental changes. Substantial empirical data show that genetic diversity rapidly deteriorates in small and isolated populations due to genetic drift, leading to reduction in adaptive potential and fitness and increase in inbreeding. Assisted gene flow (e.g. via translocations) can reverse these trends, but lack of data on fitness loss and fear of impairing population "uniqueness" often prevents managers from acting. Here, we use population genetic and riverscape genetic analyses and simulations to explore the consequences of extensive habitat loss and fragmentation on population genetic diversity and future population trajectories of an endangered Australian freshwater fish, Macquarie perch Macquaria australasica...
July 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28609989/freshwater-fishes-of-northern-australia
#6
Bradley J Pusey, Damien W Burrows, Mark J Kennard, Colton N Perna, Peter J Unmack, Quentin Allsop, Michael P Hammer
Northern Australia is biologically diverse and of national and global conservation signicance. Its ancient landscape contains the world's largest area of savannah ecosystem in good ecological condition and its rivers are largely free-flowing. Agriculture, previously confined largely to open range-land grazing, is set to expand in extent and to focus much more on irrigated cropping and horticulture. Demands on the water resources of the region are thus, inevitably increasing. Reliable information is required to guide and inform development and help plan for a sustainable future for the region which includes healthy rivers that contain diverse fish assemblages...
April 11, 2017: Zootaxa
https://www.readbyqxmd.com/read/28606404/dietary-inclusion-of-fish-oil-changes-the-semen-lipid-composition-but-does-not-improve-the-post-thaw-semen-quality-of-ram-spermatozoa
#7
Rommy Díaz, Mariana A Torres, Erwin Paz, John Quiñones, Silvana Bravo, Jorge G Farías, Néstor Sepúlveda
The aim of this study was to investigate the effects of dietary fish oil (FO) time-response on the fatty acid profile, cholesterol levels and sperm cryosurvival in ram semen. Criollo Araucano rams were randomly assigned to two groups (n=4) according to the type of supplementation: a control group without FO and a supplemented group fed a diet with 3% FO for 8 weeks. The semen lipid profile and post-thaw sperm quality were analyzed at weeks 0 (pre-supplementation), 4, 8, 12 and 16 (post-supplementation) to evaluate the effects of FO supplementation by time interaction...
May 18, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28605839/combined-effects-of-hydrologic-alteration-and-cyprinid-fish-in-mediating-biogeochemical-processes-in-a-mediterranean-stream
#8
Francesc Rubio-Gracia, David Almeida, Berta Bonet, Frederic Casals, Carmen Espinosa, Alexander S Flecker, Emili García-Berthou, Eugènia Martí, Baigal-Amar Tuulaikhuu, Anna Vila-Gispert, Lluis Zamora, Helena Guasch
Flow regimes are important drivers of both stream community and biogeochemical processes. However, the interplay between community and biogeochemical responses under different flow regimes in streams is less understood. In this study, we investigated the structural and functional responses of periphyton and macroinvertebrates to different densities of the Mediterranean barbel (Barbus meridionalis, Cyprinidae) in two stream reaches differing in flow regime. The study was conducted in Llémena Stream, a small calcareous Mediterranean stream with high nutrient levels...
June 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28602733/efficacy-of-viable-bacillus-pumilus-isolated-from-farmed-fish-on-immune-responses-and-increased-disease-resistance-in-nile-tilapia-oreochromis-niloticus-laboratory-and-on-farm-trials
#9
Prapansak Srisapoome, Nonthawit Areechon
Applications of viable Bacillus pumilus AQAHBS01 isolated from Nile tilapia farms as probiotics were studied in both laboratory and farm conditions. In the laboratory, feeding fish (approximately 50 g) with feed containing viable B. pumilus at concentrations of 1 × 10(7)-10(9) colony forming units (CFU)/kg elevated fish immune responses, as indicated by their phagocytic activity and superoxide anion levels, and led to more effective disease resistance against Streptococcus agalactiae. However, when these concentrations were applied to Nile tilapia cultures growing in cage culture systems, only B...
June 7, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28601012/diclofenac-affects-kidney-histology-in-the-three-spined-stickleback-gasterosteus-aculeatus-at-low-%C3%AE-g-l-concentrations
#10
Johanna Näslund, Jerker Fick, Noomi Asker, Elisabet Ekman, D G Joakim Larsson, Leif Norrgren
Diclofenac, a commonly used non-steroidal anti-inflammatory drug, is considered for regulation under the European water framework directive. This is because effects on fish have bean reported at concentrations around those regularly found in treated sewage effluents (∼1μg/L). However, a recent publication reports no effects on fish at 320μg/L. In this study, three-spined sticklebacks (Gasterosteus aculeatus) were exposed to 0, 4.6, 22, 82 and 271μg/L diclofenac in flow-through systems for 28days using triplicate aquaria per concentration...
May 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28599361/hydraulic-modelling-of-the-spatial-and-temporal-variability-in-atlantic-salmon-parr-habitat-availability-in-an-upland-stream
#11
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...
June 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28599354/a-profile-of-auditory-responsive-neurons-in-the-larval-zebrafish-brain
#12
Gilles Vanwalleghem, Lucy A Heap, Ethan K Scott
Many features of auditory processing are conserved among vertebrates, but the degree to which these pathways are established at early stages is not well explored. In this study, we have observed single cell activity throughout the brains of larval zebrafish with the goal of identifying the cellular responses, brain regions, and brain-wide pathways through which these larvae perceive and process auditory stimuli. Using GCaMP and selective plane illumination microscopy, we find strong responses to auditory tones ranging from 100 to 400Hz...
June 9, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28599206/mercury-flow-through-an-asian-rice-based-food-web
#13
Kasun S Abeysinghe, Guangle Qiu, Eben Goodale, Christopher W N Anderson, Kevin Bishop, David C Evers, Morgan W Goodale, Holger Hintelmann, Shengjie Liu, Christos Mammides, Rui-Chang Quan, Jin Wang, Pianpian Wu, Xiao-Hang Xu, Xiao-Dong Yang, Xinbin Feng
Mercury (Hg) is a globally-distributed pollutant, toxic to humans and animals. Emissions are particularly high in Asia, and the source of exposure for humans there may also be different from other regions, including rice as well as fish consumption, particularly in contaminated areas. Yet the threats Asian wildlife face in rice-based ecosystems are as yet unclear. We sought to understand how Hg flows through rice-based food webs in historic mining and non-mining regions of Guizhou, China. We measured total Hg (THg) and methylmercury (MeHg) in soil, rice, 38 animal species (27 for MeHg) spanning multiple trophic levels, and examined the relationship between stable isotopes and Hg concentrations...
June 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28593741/comparison-of-different-methods-for-telomere-length-measurement-in-whole-blood-and-blood-cell-subsets-recommendations-for-telomere-length-measurement-in-hematological-diseases
#14
Yvonne Lisa Behrens, Kathrin Thomay, Maike Hagedorn, Juliane Ebersold, Lea Henrich, Rainer Nustede, Brigitte Schlegelberger, Gudrun Göhring
Different methods of telomere length measurement are used to identify patients with telomeropathies. In our lab, we established four different methods for telomere length measurement, terminal restriction fragment (TRF) analysis by Southern blot analysis, quantitative PCR (qPCR), quantitative telomere/centromere fluorescence in situ hybridization (T/C-FISH) and fluorescence in situ hybridization combined with flow cytometry (FlowFISH). The methods each have distinct properties and apart from this - according to our experience and data - may have an impact on the individual result...
June 8, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28590512/tissue-specific-turnover-and-diet-tissue-discrimination-factors-of-carbon-and-nitrogen-isotopes-of-a-common-forage-fish-held-at-two-temperatures
#15
S F Colborne, A T Fisk, T B Johnson
RATIONALE: The application of stable isotopes to foraging ecology is dependent on understanding life-history and environmental factors unrelated to diet that may influence isotopic composition. Diet-tissue discrimination factors (DTDFs) and turnover rates will increase the accuracy of isotope-based studies. Furthermore, little consideration has been given to the effects of temperature or life-history stage on isotopic ratios despite the prevalence of variation in temperature and growth rates throughout life...
June 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28587111/development-of-a-flexible-artificial-lateral-line-canal-system-for-hydrodynamic-pressure-detection
#16
Yonggang Jiang, Zhiqiang Ma, Jianchao Fu, Deyuan Zhang
Surface mounted 'smart skin' can enhance the situational and environmental awareness of marine vehicles, which requires flexible, reliable, and light-weight hydrodynamic pressure sensors. Inspired by the lateral line canal system in fish, we developed an artificial lateral line (ALL) canal system by integrating cantilevered flow-sensing elements in a polydimethylsiloxane (PDMS) canal. Polypropylene and polyvinylidene fluoride (PVDF) layers were laminated together to form the cantilevered flow-sensing elements...
May 26, 2017: Sensors
https://www.readbyqxmd.com/read/28586694/challenges-and-priorities-in-shark-and-ray-conservation
#17
REVIEW
Nicholas K Dulvy, Colin A Simpfendorfer, Lindsay N K Davidson, Sonja V Fordham, Amie Bräutigam, Glenn Sant, David J Welch
Sharks, rays, and chimaeras (Class Chondrichthyes; herein 'sharks') are the earliest extant jawed vertebrates and exhibit some of the greatest functional diversity of all vertebrates. Ecologically, they influence energy transfer vertically through trophic levels and sometimes trophic cascades via direct consumption and predation risk. Through movements and migrations, they connect horizontally and temporally across habitats and ecosystems, integrating energy flows at large spatial scales and across time. This connectivity flows from ontogenetic growth in size and spatial movements, which in turn underpins their relatively low reproductive rates compared with other exploited ocean fishes...
June 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28586001/apoptosis-is-induced-by-docosahexaenoic-acid-in-breast-cancer-cells-via-death-receptor-and-mitochondria-mediated-pathways
#18
Meilan Xue, Yinlin Ge, Chundong Yu, Zheng Zheng, Xinjia He, Jinglan Zhao
In the present study, the antitumor effect of n‑3 fatty acid was evaluated, and the effect of docosahexaenoic acid (DHA) on the induction of apoptosis and its underlying mechanism were examined. Flow cytometry and western blot analysis were performed to analyze apoptosis and the expression of protein factors in human breast cancer cells. The data revealed that DHA inhibited the viability of MCF‑7 breast cancer cells in vitro, and promoted cell death by the induction of apoptosis. DHA decreased the expression of B‑cell lymphoma 2 (Bcl‑2), whereas the expression of Bcl‑2‑associated X protein was increased...
July 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28584722/the-shoaling-behavior-of-two-cyprinid-species-in-conspecific-and-heterospecific-groups
#19
Zhong-Hua Tang, Hui Wu, Qing Huang, Lu Kuang, Shi-Jian Fu
Mixed-species shoals of fish are frequently found in the field; however, little is known about individual-level interactions within these groups. We examined the collective motion of two cyprinid species (Chinese bream, Parabramis pekinensis, and qingbo, Spinibarbus sinensis) that occupy partially overlapping habitats but differ in social behavior (high vs low aggressiveness) and preferred flow regime (slow vs fast water velocity). We extracted measures of collective motion from video recordings of eight replicate groups of four individuals of either Chinese bream or qingbo (conspecific group) or two Chinese bream plus two qingbo (heterospecific group)...
2017: PeerJ
https://www.readbyqxmd.com/read/28567498/metabolic-behavioral-and-locomotive-effects-of-feeding-in-five-cyprinids-with-different-habitat-preferences
#20
Li-Juan Nie, Shi-Jian Fu
Fish generally perform routine swimming behaviors during food digestion; thus, changes in swimming performance and adjustments to spontaneous behavior resulting from digestion can have important ecological significance for wild fishes. The effects of feeding on metabolism, spontaneous activity, fast-start escape movement, and critical swimming speed (U crit) were investigated in five cyprinids with different habitat preferences, specifically the Chinese crucian carp (Carassius auratus), common carp (Cyprinus carpio), black carp (Mylopharyngodon piceus), Chinese bream (Parabramis pekinensis), and qingbo (Spinibarbus sinensis)...
May 31, 2017: Fish Physiology and Biochemistry
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