Consulta: subjectFacets:"Trout"
Registros recuperados: 12
Data/hora: 10/06/2024 13:40:53

Quantifying Expected Ecological Response to Natural Resource Legislation: a Case Study of Riparian Buffers, Aquatic Habitat, and Trout Populations
Provedor de dados: 7
Autores: Jones, Krista L; Institute of Ecology, University of Georgia; kjones@eco-metrics.com; Poole, Geoffrey C; Eco-metrics, Inc. and Institute of Ecology, University of Georgia; gpoole@eco-metrics.com; Meyer, Judy L; Institute of Ecology, University of Georgia; jlmeyer@uga.edu; Bumback, William; River Basin Center, University of Georgia; wbumback@uga.edu; Kramer, Elizabeth A; Natural Resources Spatial Analysis Laboratory, University of Georgia; lkramer@uga.edu.
Regulations governing the management of streamside vegetation (riparian buffers) lie at a nexus between environmental, social, and land development interests, and can yield especially contentious debates among stakeholders.  In 2001, the State Legislature of Georgia, USA, took up this debate; the Legislature reduced the minimum width of mandatory-forested riparian buffers along designated trout streams from &amp;#8764;30 m (100 ft) to &amp;#8764;15 m (50 ft), and commissioned this study to assess the expected response of existing trout populations.  Because our research was designed to provide rigorous and accessible data for informing this management debate, this research may serve as a general template for other studies designed to inform regulatory and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Georgia; Natural resource legislation; Riparian buffer width; Scientific assessment; Sediment; Southern Appalachians; Stream temperature; Trout.
Ano: 2006

Otolith growth in trout Oncorhynchus mykiss: supply of Ca2+ and Sr2+ to the saccular endolymph
Provedor de dados: 5
Autores: Payan, P; Borelli, G; Priouzeau, F; De Pontual, Helene; Boeuf, G; Mayer Gostan, N.
Kinetic and pharmacological characteristics of Ca2+ fluxes across the saccular epithelium of trout were studied using a perfused isolated inner ear. Ca-45(2+) influx from the Ringer solution to the endolymph was 3-4 nmoles h(-1) mu(-1) endolymph, which corresponds to a global turnover rate of the endolymph calcium of 200% h(-1). Ca2+ entry into the proximal endolymph was faster than into the distal fluid. Net Ca2+ movement across the saccular epithelium depended on the direction and intensity of the chemical gradient of calcium between the Ringer solution and the endolymph. Increasing the calcium concentration in the Ringer solution up to 4.4 mmol l(-1) provoked an accumulation of Ca2+ in both proximal and distal endolymphs, and equilibrium was reached...
Tipo: Text
Palavras-chave: Inner ear; Perfusion; Otolith; Endolymph; Flux; Calcium; Oncorhynchus mykiss; Trout.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-416.pdf

Linking swimming performance, cardiac pumping ability and cardiac anatomy in rainbow trout
Provedor de dados: 5
Autores: Claireaux, Guy; Mckenzie, David; Genge, A; Chatelier, Aurelien; Aubin, Joel; Farrell, Anthony.
We exploited the inherent individual diversity in swimming performance of rainbow trout Oncorhynchus mykiss to investigate the hypothesis that maximum cardiac performance is linked to active metabolic rate (AMR) and critical swimming speed (U-crit). Six hundred juveniles (body mass similar to 150 g) were screened using a swimming challenge of 1.2 m s(-1) to identify 'poor swimmers' and 'good swimmers', i.e. the first and last 60 fish to fatigue, respectively. These 120 fish were individually tagged and then reared in common tanks for 9 months, where they grew at similar rates and achieved a similar body mass of approximately 1100 g. Critical swimming speed (U-crit) was then measured individually in tunnel respirometers, with simultaneous recordings of...
Tipo: Text
Palavras-chave: Cardiac anatomy; Cardiac rythm; Swimming activity; Trout.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-420.pdf

Characterization and variations of organic parameters in teleost fish endolymph during day-night cycle, starvation and stress conditions
Provedor de dados: 5
Autores: Guibbolini, M; Borelli, G; Mayer Gostan, N; Priouzeau, F; De Pontual, Helene; Allemand, D; Payan, P.
The aim of the present work was to examine the modifications of the organic composition of fish endolymph under environmental conditions (day-night cycle, starvation and Cl-2-Stress) known to modify otolith growth. Endolymph electrophoretic patterns were compared. An antibody raised against the trout otolith organic matrix allowed examining the variations of organic matrix precursors in the endolymph under the above conditions. Western blot analysis showed bands around 60-80 kDa. A 50% decrease of immunolabelling was observed during the night whereas increases were seen after starvation (factor 3) or stress (factor 2) suggesting that these variations could be related to the organic matrix deposit. A factor retarding in vitro CaCO3 crystallization (FRC) was...
Tipo: Text
Palavras-chave: Turbot; Trout; Stress; Starvation; Day night cycle; Organic matrix; Otolith calcification; In vitro crystallization; Endolymph.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1875.pdf

Towards environmentally sustainable aquaculture: Comparison between two trout farming systems using Life Cycle Assessment
Provedor de dados: 5
Autores: Roque D'Orbcastel, Emmanuelle; Blancheton, Jean-paul; Aubin, Joel.
Life Cycle Assessment(LCA) was applied to evaluate the global environmental impact of two scenarios of trout production systems based on the operational information from an operational farm using a flow through system (FFF) and an experimental pilot low head recirculating system (RSF) located on the same site. The main differences between the environmental balances of the two systems were relative to water use, eutrophication potential and energy use. Independently of the system used, feed is the key indicator in determining the environmental balance (notwithstanding eutrophication potential and water dependence) monitored by fish production, chemical products, buildings and energy consumption. Consequently, when considering the RSF with a lower feed...
Tipo: Text
Palavras-chave: Flow through system; Recirculation system; Trout; Aquaculture; Life Cycle Assessment.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6510.pdf

Effect of genistein-enriched diets on the endocrine process of gametogenesis and on reproduction efficiency of the rainbow trout Oncorhynchus mykiss
Provedor de dados: 5
Autores: Bennetau Pelissero, Catherine; Breton, Bernard; Bennetau, Bernard; Corraze, Genevieve; Le Menn, Françoise; Davail Cuisset, Blandine; Helou, Chantal; Kaushik, Sadasivam.
Three practical diets were formulated to contain 0, 500, or 1000 ppm genistein. The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of beta FSH and beta LH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 +/- 0.39 to 1.47 +/- 0.23 for beta FSH and from 0.44 +/- 0.09 to 0.31 +/- 0.09 for beta LH). There was a significantly reduced 17...
Tipo: Text
Palavras-chave: Diet; Reproduction; GTH; Vitellogenin; Steroid; Trout; Genistein.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-738.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 2. étude biosédimentaire
Provedor de dados: 5
Autores: Kempf, Marc; Cadour, Gwenael; Jeanneret, Hélène; Mear, Yan; Miramand, Pierre; Merceron, Michel.
This document is a result of an environmental impact study carried out between 1993 and 1995 on the site of a marine trout culture located in the Harbour of Cherbourg, France. It deals with the solid waste of the farm and concems deposition rate, sediment analysis and chemistry (fine fraction &lt; 63 ~m, organic matter, carbon, nitrogen, copper and zinc), bottom living organisms and underwater video monitoring. The impact observed is very moderate and localised. This is mainly due to the strong d)'TIamics and flushing rate of the site. A seperate volume of the same study deals with dissolved waste and concems the water mass (volume 1 : water and pelagos). (Not controlled OCR)
Tipo: Text
Palavras-chave: Rade de Cherbourg; Étude biosédimentaire; Impact; Salmoniculture marine; France; Cherbourg; Benthos; Sediment; Environmental impact; Trout; Marine fish farming.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3349.pdf

Nutritional regulation and tissue specificity of gene expression for proteins involved in hepatic glucose metabolism in rainbow trout (Oncorhynchus mykiss)
Provedor de dados: 5
Autores: Panserat, Stéphane; Plagnes Juan, E; Kaushik, Sadasivam.
Rainbow trout (Oncorhynchus mykiss) are known to use dietary carbohydrates poorly. One of the hypotheses to explain the poor utilisation of dietary glucose by these fish is a dysfunction in nutritional regulation of hepatic glucose metabolism. In this study, we obtained partial clones of rainbow trout cDNAs coding for a glucose transporter (Glut2), and for the enzymes 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (6PF-2K/F-2,6BPase), fructose-1,6-bisphosphatase (FBPase) and pyruvate kinase (PI(), Their deduced amino acid sequences were highly similar to those of mammals (up to 80% similarity), In a study of nutritional regulation, the Glut2 gene was highly expressed in the liver irrespective of the nutritional status of the trout, in agreement with...
Tipo: Text
Palavras-chave: Oncorhynchus mykiss; Trout; Bifunctional enzyme; Pyruvate kinase; Fructose bisphosphatase; Glucose transporter; Glucose metabolism; Liver metabolism.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-415.pdf

Ionic composition of endolymph in teleosts: Origin and importance of endolymph alkalinity
Provedor de dados: 5
Autores: Payan, P; Kossmann, Hans; Watrin, A; Mayer-gostan, N; Boeuf, Gilles.
Ionic (Na+, K+, Cl-, PO43-, pH), total CO2, total calcium and protein concentrations in the plasma and endolymph of the inner ear were compared in trout Oncorhynchus mykiss and turbot Scophthalmus maximus. In both species, saccular endolymph was characterized by high levels of K+ and total CO2 and in trout by an alkaline pH, The kinetic characteristics of proton secretion across the saccular epithelium of trout were investigated using a titration technique in which isolated saccules were mounted as closed sacs. The rate of proton secretion depends strongly on the pH of the Ringer's solution and secretion stops at a pH below 7.2, Proton secretion is driven by an energy-dependent mechanism involving basolateral ouabain-sensitive Na+/K+ exchangers. Proton...
Tipo: Text
Palavras-chave: Teleost; Inner ear; Saccular epithelium; Proton secretion; Otolith; Biocalcification; Trout; Oncorhynchus mykiss; Turbot; Scophthalmus maximus.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00336/44695/44987.pdf

Water quality and rainbow trout performance in a Danish Model Farm recirculating system: Comparison with a flow through system
Provedor de dados: 5
Autores: Roque D'Orbcastel, Emmanuelle; Blancheton, Jean-paul; Belaud, Alain.
The objective was to compare water quality and fish growth and mortality in a pilot scale recirculating system (RS) and a control tank in flow through system (FTS). The RS was designed after the Danish Model Trout Farm and operated with a make Lip Water renewal rate of 9 m(3) kg(-1) of fish produced. RS water quality did not decrease significantly with water flow rate decrease in the RS. During the experiment, the RS water treatment system presented solids removal efficiency of 59.6 +/- 27.7% d(-1), ammonia oxidation of 45 +/- 32 g m(-3) d(-1), oxygenation yield of 392 +/- 132 g of O-2 kWh(-1) and CO2 degassing of 23.3 +/- 11.9% pass(-1). In the RS, nitrite concentration was 0.15 +/- 0.07 mg l(-1), close to the toxicity threshold; a N-2 supersaturation...
Tipo: Text
Palavras-chave: Energy cost; Water quality; Flow rate; Treatment system; Performance; Trout; Recirculating system.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6506.pdf

A Demand System Analysis of the U.S. Trout Market
Provedor de dados: 31
Autores: Lee,   Young-Jae; Kennedy,   P. Lynn; Hilbun,   Brian M.
The objective of this study is to analyze how imported trout affects the domestic U.S. trout industry.
Tipo: Conference Paper or Presentation
Palavras-chave: Trout; Demand System; Import; International Relations/Trade; F10; F11; F13.
Ano: 2010
URL: http://purl.umn.edu/56414

Substitutability of Fishmeal in Diets for Salmon and Trout: A Meta-Analysis
Provedor de dados: 31
Autores: Drakeford,   Ben; Pascoe,   Sean.
Intensive aquaculture, especially the production of carnivorous species, requires artificial feeding.  Fishmeal and oil are preferred to vegetable proteins, since marine proteins provide the essential nutrients required by farmed fish.  Therefore, given the stagnant production of reduction species and the rapid increase in aquaculture production, fishmeal availability would pose a biological constraint on aquaculture contribution to world fish supplies in the future, unless alternative feed sources can be incorporated in diets.  In this paper, the technical substitutability between fish and vegetable based feeds are assessed through the estimation of Morishima elasticities of substitution.  These are derived from a meta-analysis production function.
Tipo: Conference Paper or Presentation
Palavras-chave: Fishmeal; Meta-analysis; Salmon; Trout; Elasticity; Livestock Production/Industries; Q2.
Ano: 2005
URL: http://purl.umn.edu/56074