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221 results for “rainbow trout”
GPR84 and GPR119 in the central regulation of food intake in rainbow trout
<p>We evaluated the role of GPR84 and GPR119 in food intake regulation in fish using rainbow trout (<i>Oncorhynchus mykiss</i>) as a model. In a first experiment, we assessed the effects on food intake of intracerebroventricular treatment with agonists of these receptors. In a second experiment, we assessed in hypothalamus and hindbrain the impact of the same treatments on mRNA abundance of neuropeptides involved in the metabolic control of food intake (<i>npy, agrp1</i>, <i>pomca1</i>, and <i>cartpt</i>) as well as in changes in parameters related to signaling pathways and transcription factors involved in the integrative response leading to neuropeptide production. Treatment with both agonists elicited an anorectic response in rainbow trout attributable to changes observed in the mRNA abundance of the four neuropeptides. Changes in neuropeptides relate to changes observed in mRNA abundance and phosphorylation status of the transcription factor Foxo1. These changes occurred in parallel with changes in phosphorylation status of Ampkα and Akt, mRNA abundance of mTOR as well as in signaling pathways related to PLCβ and IP3. These results allow us to suggest that 1) at least part of the capacity of fish brain to sense MCFA like octanoate depends on the function of GPR84, and 2) the capacity of fish brain to sense NAE or triglyceride-derived molecules through binding of these ligands to GPR119</p>
Growth performance, bioavailability of toxic and essential elements and nutrients, and biofortification of iodine of rainbow trout (Onchorynchus mykiss) fed blends with sugar kelp (Saccharina latissima)
<p>Data from the publication Granby et al 2020 Growth performance, bioavailability of toxic and essential elements and nutrients, and biofortification of iodine of rainbow trout (Onchorynchus mykiss) fed blends with sugar kelp (Saccharina latissima). Food Chemical Toxicology 141, 111387, https://doi.org/10.1016/j.fct.2020.111387</p> <p> </p>
Assessing the population genetic structure of introduced rainbow trout (Oncorhynchus mykiss) in the Lake Tahoe basin: A case for understanding hybridization potential during the reintroduction of the native Endangered Species Act listed Lahontan cutthroat trout (O. clarkii henshawi)
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Data from: Step-patterned survivorship curves: mortality and loss of equilibrium responses to high temperature and food restriction in juvenile rainbow trout (Oncorhynchus mykiss)
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Data from: Winning the invasion roulette: escapes from fish farms increase admixture and facilitate establishment of non-native rainbow trout
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GPR84 and GPR119 in the central regulation of food intake in rainbow trout
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Data from: Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams
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Data from: RAD sequencing yields a high success rate for westslope cutthroat and rainbow trout species-diagnostic SNP assays
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Data from: Predation, metabolic priming and early life-history rearing environment affect the swimming capabilities of growth hormone transgenic rainbow trout
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Data from: Contrasting genetic metrics and patterns among naturalized rainbow trout (Oncorhynchus mykiss) in two Patagonian lakes differentially impacted by trout aquaculture
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Data from: Temporal genetic variance and propagule-driven genetic structure characterize naturalized rainbow trout (Oncorhynchus mykiss) from a Patagonian lake impacted by trout farming
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Data from: Metabolic traits of westslope cutthroat, introduced rainbow trout and their hybrids in an ecotonal hybrid zone along an elevation gradient
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It takes time to heal a broken heart: Ventricular plasticity improves heart performance after myocardial infarction in rainbow trout, Oncorhynchus mykiss
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Dataset for "Effect of visual environmental enrichment on the welfare and development of juvenile farmed rainbow trout (Oncorhynchus mykiss)"
<p>This is the dataset used for the inaugural dissertatoin thesis "Effect of Visual Environmental Enrichment on the Welfare and Development of Juvenile Farmed Rainbow Trout (Oncorhynchus mykiss)".</p> <p>Submittetd by Melchior Isler.</p>
Genetic divergence and diversity reflect a predominant freshwater resident life history in Rainbow Trout from southwestern Alaska
<p>Rainbow Trout <i>Oncorhynchus mykiss</i> in southwestern Alaska occupy coastal watersheds near the northern boundary of the species native range and support a world class wild trout sport fishery. Although low freshwater temperatures and a short growing season in this region may favor anadromy, these populations appear to exhibit a freshwater resident life history strategy. In this study we used genetic data to evaluate two hypotheses regarding the influence of the presumed migratory behavior of these Rainbow Trout on reproductive isolation among and within watersheds. The results were largely consistent with the predictions but there were exceptions. The data supported the hypothesis that the freshwater resident behavior precludes marine-mediated gene flow resulting in large genetic divergence and low admixture among watersheds. The estimate of <i>F<sub>CT</sub></i> (among-watershed differentiation, 0.350) was large and reflected over 96% of the variation among all sampled aggregations (<i>F<sub>ST</sub></i> = 0.363). However, evidence of admixed individuals in two adjacent watersheds and five first generation migrants among five watersheds suggests that the potential for coastal migration with gene flow exists in these populations. The data also supported the hypothesis that aggregations formed within watersheds during the spawning period (May-June) represent reproductively isolated populations. The pairwise estimates of <i>F<sub>ST</sub></i> and the <i>G</i>-test results revealed population structure in four of the six watersheds tested. However, not all aggregation pairs were found genetically distinct and there was notable variation in the pairwise <i>F<sub>ST</sub></i> estimates (0.000 – 0.067). In summary, the data reflected the predicted results for each hypothesis, but also revealed exceptions that, consistent with tagging studies, demonstrate the complexity of migratory behavior in southwestern Alaska Rainbow Trout. We discuss the implications of these results for fishery management and conservation.</p>
Datatset to article: Batch-to-batch variation in nutrient digestibility of black soldier fly larvae meals in rainbow trout
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Data from: Near absence of differential gene expression in the retina of rainbow trout after exposure to a magnetic pulse: implications for magnetoreception
The ability to perceive Earth's magnetic field, or magnetoreception, exists in numerous animals. Although the mechanism underlying magnetoreception has not been clearly established in any species, in salmonid fish it is hypothesized to occur by means of crystals of magnetite associated with nervous tissue such as the brain, olfactory organ, or retina. In this study, rainbow trout (Oncorhynchus mykiss) were exposed to a brief magnetic pulse known to disrupt magnetic orientation behavior in several animals. Changes in gene expression induced by the pulse were then examined in the retina. Analyses indicated that the pulse elicited differential expression of only a single gene, gamma-crystallin M3-like (crygm3). The near-absence of an effect of the magnetic pulse on gene expression in the retina stands in sharp contrast to a recent study in which 181 genes were differentially expressed in brain tissue of O. mykiss after exposure to the same pulse. Overall, our results suggest either that magnetite-based magnetoreceptors in trout are not located in the retina, or else that they are unaffected by magnetic pulses that can disrupt magnetic orientation behavior in animals.
Data from: Environmental associations with gene transcription in Babine Lake rainbow trout: evidence for local adaptation
The molecular genetic mechanisms facilitating local adaptation in salmonids continue to be poorly characterized. Gene transcription is a highly regulated step in the expression of a phenotype and it has been shown to respond to selection and thus may be one mechanism that facilitates the development of local adaptation. Advances in molecular genetic tools and an increased understanding of the functional roles of specific genes allow us to test hypotheses concerning the role of variable environments in shaping transcription at known-function candidate loci. To address these hypotheses, wild rainbow trout were collected in their first summer and subjected to metabolic and immune challenges. We assayed gene transcription at candidate loci that play a role in the molecular genetic response to these stresses, and correlated transcription with temperature data from the streams and the abundance and diversity of bacteria as characterized by massively parallel pyrosequencing. Patterns of transcriptional regulation from resting to induced levels varied among populations for both treatments. Co-inertia analysis demonstrated significant associations between resting levels of metabolic gene transcription and thermal regime (R2 = 0.19, P = 0.013) as well as in response to challenge (R2 = 0.39, P = 0.001) and resting state and challenged levels of cytokine gene transcription with relative abundances of bacteria (resting: R2 = 0.25, P = 0.009, challenged: R2 = 0.65, P = 0.001). These results show that variable environments, even within a small geographic range (<250 km), can drive divergent selection among populations for transcription of genes related to surviving stress.
Data from: Candidate genes mediating magnetoreception in rainbow trout (Oncorhynchus mykiss)
Diverse animals use Earth's magnetic field in orientation and navigation, but little is known about the molecular mechanisms that underlie magnetoreception. Recent studies have focused on two possibilities: (i) magnetite-based receptors; and (ii) biochemical reactions involving radical pairs. We used RNA sequencing to examine gene expression in the brain of rainbow trout (Oncorhynchus mykiss) after exposure to a magnetic pulse known to disrupt magnetic orientation behaviour. We identified 181 differentially expressed genes, including increased expression of six copies of the frim gene, which encodes a subunit of the universal iron-binding and trafficking protein ferritin. Functions linked to the oxidative effects of free iron (e.g. oxidoreductase activity, transition metal ion binding, mitochondrial oxidative phosphorylation) were also affected. These results are consistent with the hypothesis that a magnetic pulse alters or damages magnetite-based receptors and/or other iron-containing structures, which are subsequently repaired or replaced through processes involving ferritin. Additionally, some genes that function in the development and repair of photoreceptive structures (e.g. crggm3, purp, prl, gcip, crabp1 and pax6) were also differentially expressed, raising the possibility that a magnetic pulse might affect structures and processes unrelated to magnetite-based magnetoreceptors.
Data from: Near absence of differential gene expression in the retina of rainbow trout after exposure to a magnetic pulse: implications for magnetoreception
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