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Showing 1 to 17 of 17 for “"Japanese medaka"”.
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Examining swim bladder inflation failure as a toxicological endpoint in Japanese medaka (Oryzias latipes)
… diclofenac, impaired swim bladder inflation of Japanese medaka (Oryzias latipes). After exposure to individual compounds, mixture exposures to no-observed-effect concentrations of these compounds were conducted. Significant effects on swim bladder inflation were observed for a binary mixture of …
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The Effects of Toluene on the Ontogenetic Development of the Fish, Oryzias latipes, the Japanese Medaka
… of the Cyprinodontid fish, Oryzias latipes, the Japanese Medaka was established. By the use of static bioassays, the median tolerance limits (TL 50 values) were calculated with their respective 95% confidence limits for different stages of embryonic development exposed to the chemical for periods …
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Vitellogenin induction in male Japanese medaka exposed to the chemotherapeutics: oxytetracycline, Romet-30, and copper sulfate
The specificity of a medaka vitellogenin (Vtg) enzyme-linked immunosorbent assay (ELISA) kit was tested on adult hybrid tilapia to determine if vitellogenin could be successfully measured in tilapia using this method. Adult hybrid (Orechromis niloticus x Oreochromis mossambicus x Oreochromis …
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Aggression, monopolization and growth depensation within groups of Japanese medaka (Oryzias latipes) : interactions between the temporal and spatial clumping of food
… clumping of food by allowing groups of ten Japanese medaka (Oryzias latipes) to compete, over a 4 week period, for food in a 2 x 2 factorial design. As expected, the intensity of aggression increased as the spatial clumping of food increased and as the temporal clumping of food decreased. …
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Silence of the fish: injection of photoswitchable short interfering RNA oligonucleotides into Japanese medaka embryos (oryzias latipes) to photochemically control gene silencing
… on a novel technique to inject single cell medaka embryos with both Wt and F-siRNAs. Medaka are a small freshwater teleost fish that have a number of desirable features for use as a vertebrate model in gene silencing projects. These attributes include daily spawning, a number of useful …
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The Evolutionary Effects of Fishing: Implications for Stock Management and Rebuilding
… dynamics, I first determined the suitability of Japanese medaka (Oryzias latipes) for selection experiments. I performed selection experiments using Japanese medaka and report how morphology and life-history characteristics changed over multiple generations of selection. I then used these …
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Population Genetics of Death Valley Pupfishes (Cyprinodontidae:Cyprinodon Spp.) and the Identification of a New Retrotransposable Element Family
… of the SW1 element family was undertaken in the Japanese medaka (Oryzias latipes) as well as in the pupfish genome. The Japanese medaka is a model organism widely used for genetic and developmental biology studies.
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Perspectives On Ethanol Toxicity In Medaka Embryogenesis And Possible Protection By Asian Ginseng (Panax Ginseng): Histological And Biochemical Analysis
… embryo, especially zebrafish (Danio rerio) and Japanese medaka ( Oryzias latipes), are long-established models for research in developmental biology and have been used to explore alcohol's effect on neurogenesis, cardiogenesis, intracellular signaling, neurobehavioral aspects, and apoptosis. …
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Embryotoxicity of dioxin-like chemicals extracted from American eels (Anguilla rostrata) from the St. Lawrence River System
… to their offspring, as assessed by using Japanese medaka (Oryzias latipes), a surrogate species. Medaka embryos were first injected with 2,3,7,8-tetracholordibenzo-p-dioxin (TCDD) to establish their sensitivity to this test chemical expressed as an 11-day EC50 of 3.79 pg/mg, for the …
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Chemical, Toxicological, and Microbial Characterization of New Orleans Sediments Following Hurricane Katrina
… was collected and toxicity was tested using Japanese medaka (Oryzias latipes) embryos. Sediments with the highest contaminant levels showed the highest embryonic mortality and most delayed development. However, no sediment caused an increased mutant frequency. When the most contaminated site …
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Various aspects of reproductive control in freshwater fishes
… ovaries. CA was administered orally to juvenile Japanese medaka (Oryzias latipes) in two experiments to determine the possible role of the antiandrogen on sex determination. Sex ratios were determined in the mature fish by dimorphic coloration, secondary sex characters, and histological …
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Gonadal intersex in teleosts: Mechanisms, molecular biomarkers and diagnostic assays
… laboratory exposures were performed using Japanese medaka <em>Oryzias latipes</em>, a fish model with a well-understood sex determination mechanism and high sensitivity to exogenous hormone exposure (Chapter 3). First, we identified a gene, ovary structure protein 1 (<em>osp1</em>), with …
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Development and Standardization of a Short-Term Assay for Evaluating Polluted Estuarine and Coastal Environments: The Medaka Embryo-Larval Assay
<p>The eggs of the Japanese medaka (Oryzias latipes) were employed in a number of studies to develop a routine, standardized assay which can assess the acute and sublethal impacts of individual toxicants and complex mixtures. The eggs of this Cyprinodont minnow were topically treated with each …
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Functional and pathological responses of selected aquatic organisms to chrysotile asbestos
… promelas), and egg, larval and juvenile Japanese Medaka (Oryzias latipes) to chrysotile asbestos were investigated in 96-hour to 91-day tests. Chrysotile significantly reduced siphoning activity and shell growth of adult clams and siphoning, shell growth, and weight gain of juveniles at …
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Valproic Acid-Induced Teratogenesis in Japanese Rice Fish (Oryzias Latipes) Embryogenesis
… of affected children. We are developing the Japanese rice fish (Oryzias latipes), also known as Japanese medaka, as an animal model to study valproate-induced teratogenesis during the period of embryogenesis. Fertilized embryos of Japanese rice fish at three developmental stages (group A: 0–2 …
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Japanese courage: a genetic analysis of complex traits in medaka fish and humans
… to create differences in behaviour, using the Japanese medaka fish as a model organism. Chapter 1 sets out the introduction to the diverse topics covered in this thesis, and is followed by five substantive chapters. Chapter 2 describes several genomic characteristics of the Medaka Inbred …