Trout Farming Articles
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In vitro biotransformation rates in fish liver S9: Effect of dosing techniques
In vitro biotransformation assays are currently being explored to improve estimates of bioconcentration factors of potentially bioaccumulative organic chemicals in fish. This study compares thin‐film and solvent‐delivery dosing techniques, as well as single vs. multiple chemical dosing for measuring biotransformation rates of selected polycyclic aromatic hydrocarbons in rainbow trout ...
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Effects of anionic polyacrylamide products on gill histopathology in juvenile rainbow trout (Oncorhynchus mykiss)
Anionic polyacrylamide (PAM) products are commonly used to remove suspended materials from turbid waters and to help mitigate soil erosion. In the present study, juvenile rainbow trout (Oncorhynchus mykiss) were exposed to between 3 to 300 mg/L of ten commercially available PAMS (Clearflow Water Lynx Polymer Log and Clearflow Soil Lynx Granular Polymer; Clearflow Enviro Systems Group Inc.) and ...
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Nechako White Sturgeon Conservation Centre - Case Study
The Freshwater Fisheries Society of BC developed the Nechako White Sturgeon Conservation Centre to try to prevent extinction of this endangered species. Wild caught brood fish are held in the facility until spawning is complete. Controlled family groupings of young sturgeon are hatched in McDonald jars and reared for one year, first in 0.5 m3 and 1.5m3 combi tanks, then 8 m3 tanks before release. ...
By PR Aqua, ULC
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Biomagnification and tissue distribution of perfluoroalkyl substances (PFASs) in market‐size rainbow trout (Oncorhynchus mykiss)
The biomagnification potential as well as the substance and tissue specific distribution of perfluoroalkyl substances (PFASs) in market‐size rainbow trout (Oncorhynchus mykiss) was investigated. Rainbow trout with an average body weight of 314 ± 21 g were exposed to perfluorobutane sulfonate (PFBS), perfluorohexane sulfonate (PFHxS), perfluorooctane sulfonate (PFOS), perfluorooctanoic acid ...
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COMPARATIVE PHARMACEUTICAL METABOLISM BY RAINBOW TROUT (ONCORHYNCHUS MYKISS) LIVER S9 FRACTIONS
The occurrence of pharmaceuticals in the environment presents a challenge of growing concern. In contrast to many industrial compounds, pharmaceuticals undergo extensive testing prior to their introduction to the environment. In principal, therefore, it may be possible to employ existing pharmacological safety data using biological “read‐across” methods to support screening‐level ...
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Diclofenac: New data on chronic toxicity and bioconcentration in fish
Diclofenac (DCF) is a widely used nonsteroidal anti‐inflammatory drug that is regularly detected in surface waters. To support a robust aquatic risk assessment, two early life stage (ELS) tests, compliant with the Organisation for Economic Co‐operation and Development (OECD) test guideline 210, were conducted in rainbow trout and in zebrafish. Population relevant endpoints, such as hatching, ...
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Pathogenic infection confounds induction of the estrogenic biomarker vitellogenin in rainbow trout
To examine the behavior of the estrogenic biomarker vitellogenin (VTG) under the combined impact of estrogens and pathogens, parasite‐infected or noninfected rainbow trout were exposed to two doses of 17β‐estradiol (E2). Infected and E2‐exposed fish showed significantly lower hepatic VTG mRNA levels than healthy fish. Transcriptome data suggest that this was due to energetic constraints. Reduced ...
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Assessing population‐level effects of zinc exposure to brown trout (Salmo trutta) in the Arkansas River at Leadville, CO
We assessed population‐level risk to upper Arkansas River brown trout (Salmo trutta L.) due to juvenile exposure to zinc. During spring, individuals in the sensitive young‐of‐the‐year life stage are exposed to elevated zinc concentrations from acid mine drainage. We built and used a simple life‐history population model for the risk assessment, with survival and fecundity parameter values drawn ...
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Performance of an
in-situ rotating biological contactor in a recirculating aquaculture systemThe start-up and activation of a nitrifying rotating biological contactor (RBC) and its performance inside a culture tank of rainbow trout were studied. First, in a lab-scale operation, the system was fed with a synthetic medium containing a high ammonia concentration (567 mg NH4+-N L−1) and operated at a high hydraulic retention time (HRT) (6.5 days) to minimize the wash-out of the biomass and ...
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Fish farming at Kontiolahti
At Kontiolahti Fish farm the cuttings of salmon, trout and rainbow trout are cultivated to juveniles. Spawn is hatched and the juveniles of 0+ age-class are farmed inside. The older juveniles are farmed outside in surface basins. The water flow is 100-170 l/s depending on the season. Situation in the beginning The oxygen rate of the becoming water to the farm was not enough time to time, only ...
By W-Rix Ltd
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Dietary Uptake Models Used for Modeling the Bioaccumulation of Organic Contaminants in Fish - Critical Review
Numerous models have been developed to predict the bioaccumulation of organic chemicals in fish. Although chemical dietary uptake can be modeled using assimilation efficiencies, bioaccumulation models fall into two distinct groups. The first group implicitly assumes that assimilation efficiencies describe the net chemical exchanges between fish and their food. These models describe chemical ...
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The Effect of Creosote on Vitellogenin Production in Rainbow Trout (Oncorhynchus mykiss)
Abstract As part of a broader investigation into the effects of creosote treatments on the aquatic biota in pond microcosms, we examined the possible implications for vitellogenin (Vtg) production in Oncorhynchus mykiss [rainbow trout (RT)]. Vtg is the precursor of egg yolk protein and has emerged as a useful biomarker of exposure to estrogenic substances. Our a priori intent was to assess the ...
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Migration barriers protect indigenous brown trout (Salmo trutta) populations from introgression with stocked hatchery fish
Brown trout populations in the Belgian rivers Scheldt and Meuse have been intensively stocked in the past decades, often with material of uncertain origin. Moreover, the species habitat has become increasingly fragmented, preventing gene flow between neighboring populations. We assessed how this impacted genetic diversity and population structure by analyzing 12 wild populations (total n=309) and ...
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Nutrient-Balance Modeling as a Tool for Environmental Management in Aquaculture: The Case of Trout Farming in France
The control and prevention of nutrient pollution from fish farming plays an essential role in the French regulatory framework. Assessing nutrient emissions from fish farms is important in terms of farm authorization, taxation, and monitoring. Currently employed strategies involve both water sampling and empirical modeling. This article reports the work and outcomes of an expert panel that ...
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Effects of Dietary Selenomethionine on Larval Rainbow Trout
Increased selenium (Se) concentrations in water (>10 lg/L) have been measured in the San Diego Creek, which is a tributary of the Upper Newport Bay in Orange County, CA. The objective of this study was to develop tissue- and dietary-based thresholds for Se in resident fish species in San Diego Creek. A 90-day dietary experiment was conducted to determine the effects of seleno-L-methionine (SeMe) ...
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State Fish Hatcheries and Invasive Species Don’t Mix
INTRODUCTION The Vermont Fish and Wildlife Department is responsible for the protection and management of the state’s fish populations. Cultured fish are stocked in natural and manmade areas that are excellent for growth and survival but have little or no spawning habitat. Other stocking areas include natural water bodies where spawning and nursery habitats have been destroyed or isolated ...
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