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Registros recuperados: 9
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Comparison of brown trout (Salmo trutta) reared in fresh water and sea water to freshwater rainbow trout (Oncorhynchus mykiss) .1. Growth and nitrogen balance ArchiMer
Dosdat, Antoine; Metailler, Robert; Desbruyeres, Elisabeth; Huelvan, Christine.
Brown trout and rainbow trout (average weight 100 g) were reared in fresh water at 12 degrees C under the same conditions before transfer of brown trout to sea water, in order to compare nitrogen utilisation in the two species. Apparent protein digestibility (ADC), nitrogen (ammonia and urea) excretion, protein productive value (PPV) and actual observed nitro en mass balance were determined. Rainbow trout raised in fresh water had a higher growth rate (1.1 vs 0.8%. d(-1)), better food conversion ratio (0.7 vs 1.0), better ADC (91 vs 85%) and PPV (45 vs 35%) and lower ammonia excretion rates than brown trout reared in fresh water. Transferring brown trout to sea water induced lower PPV (30%) and ammonia and urea excretion. Salinity did not modify metabolic...
Tipo: Text Palavras-chave: Truite commune; Truite arc-en-ciel; Excrétion; Ammoniaque; Urée; Digestibilité; Croissance; Rétention protéique; Rainbow trout; Brown trout; Excretion; Ammonia; Urea; Digestibility; Growth; Protein productive value.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00188/29885/28342.pdf
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Diet of stocked and wild trout, Salmo trutta: Is there competition for resources? IPB - Escola Superior Agrária
Teixeira, Amílcar; Cortes, R..
Stocked and native trout diet was assessed in two north-eastern Portugal headstreams during the summer season of three successive years (2000 to 2002). Significant differences were detected in the diet composition between stocked (age 1+) trout and distinct size-class of native trout. Stocked fish showed preference, almost exclusively, for food items captured near the surface (primarily terrestrial adult insects), emergent pupae and subimagos. In contrast, young-of-year (YOY) native trout fed predominantly on the most available aquatic prey taxa such as Chironomidae (Diptera) larvae and Baetidae (Ephemeroptera) nymphs; however, Trichoptera larvae were not taken. Native trout preference changed from benthic aquatic invertebrates to terrestrial origin...
Tipo: Article Palavras-chave: Brown trout; Stocking; Feeding; Intraspecific competition.
Ano: 2006 URL: http://hdl.handle.net/10198/985
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First isolation of hirame rhabdovirus from freshwater fish in Europe ArchiMer
Borzym, E.; Matras, M.; Maj-paluch, J.; Baud, M.; De Boisseson, C.; Talbi, Chiraz; Olesen, N. J.; Bigarre, L..
A rhabdovirus was isolated in cell culture inoculated with tissue material from diseased grayling, Thymallus thymallus (L.), originating from a fish farm affected by a mortality episode in Poland. Diagnostics tests showed that the virus was not related to novirhabdoviruses known in Europe, nor to vesiculovirus-like species, except perch rhabdovirus (PRhV) with which it shared moderate serological relations. However, RT-PCR with PRhV probes gave negative results. To identify the virus, a random-priming sequence-independent single primer amplification was adopted. Surprisingly, two of the obtained sequences exhibited a high identity (>99%) with hirame rhabdovirus (HIRRV), a novirhabdovirus usually found in fish in marine Asiatic countries, for instance...
Tipo: Text Palavras-chave: Outbreak; Brown trout; Rhabdovirus; Sequence-independent single primer amplification; Molecular tracing; Grayling.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00197/30852/32727.pdf
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Heavy metal contamination and hepatic toxicological responses in brown trout (Salmo trutta) from the Kerguelen Islands ArchiMer
Jaffal, Ali; Betoulle, Stephane; Biagianti-risbourg, Sylvie; Terreau, Alexandre; Sanchez, Wilfried; Paris-palacios, Severine.
The Kerguelen Islands include various species of freshwater fish such as brown trout (Salmo trutta). These trout are among the most isolated from direct anthropogenic impact worldwide. This study was designed to analyse cadmium (Cd) and copper (Cu) concentrations in the liver of Kerguelen brown trout, and to assess the possible impacts of these metals on hepatic histopathology and oxidative stress parameters (superoxide dismutase and catalase activity and glutathione levels). Trout were caught in the Chateau River, the Studer Lakes and the Ferme Pond, close to the scientific station of the Kerguelen Islands, corresponding to three morphotypes (river, lake and station). Kerguelen trouts' hepatic concentrations of Cd and Cur were similar to those reported in...
Tipo: Text Palavras-chave: Brown trout; Freshwater; Fish; Sub-Antarctic; Liver; Biomarkers.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00499/61109/64571.pdf
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Identification of odour-active compounds in muscle of brown trout (Salmo trutta) as affected by dietary lipid sources ArchiMer
Serot, Thierry; Regost, Christelle; Arzel, Jacqueline.
The effect of fatty acid composition on odour-active compounds in brown trout (Salmo trutta) muscle was evaluated. The fillets were obtained from three groups of fish fed experimental diets containing either fish oil (170), soybean oil (SO) or linseed oil (LO). Muscle fatty acid composition was shown to be influenced by diet. Thirty-one odorous compounds were detected by gas chromatography/olfactometry (frequency-of-detection method). Most of these compounds were formed by the oxidation of unsaturated fatty acids. Independently of diet, (E)-2-pentenal, (E)-2-pentenol and (E)-2-hexenol contribute strongly to the odour of brown trout. (E,Z)-2,4-Heptadienal was detected with high frequency in fish fed diets containing high levels of n-3 PUFAs (FO and LO...
Tipo: Text Palavras-chave: Vegetable oils; Olfactometry; Odour active compounds; Brown trout.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-722.pdf
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Is supplemental stocking of brown trout (Salmo trutta) worthwhile in low productive streams? IPB - Escola Superior Agrária
Cortes, R.; Teixeira, Amílcar; Pereira, C..
The effect of trout stocking was evaluated in two headstreams located in northern Portugal in order to assess the impact on wild trout (Salmo trutta L.) and to analyze the success of this operation. The results obtained exhibited the limitation of stocking: 1) the clumped character of the release fishes created a high mortality and limited the increasing of salmonid population to a few weeks; 2) because density-dependent factors seem to prevail in the regulation of salmonid populations, stocking is beneficial only if a population has became scarce, otherwise, the autochthonous fish may be strongly impacted; 3) the relative vulnerability of each age class of the native trout may vary according with the site.
Tipo: Article Palavras-chave: Stocking; Brown trout; Impact; Fish management.
Ano: 1996 URL: http://hdl.handle.net/10198/5314
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Morphological variation in a secondary contact between divergent lineages of brown trout (Salmo trutta) from the Iberian Peninsula Genet. Mol. Biol.
Hermida,Miguel; San Miguel,Eduardo; Bouza,Carmen; Castro,Jaime; Martínez,Paulino.
The aim of this study was to analyze the morphological variation of brown trout (Salmo trutta) in the Duero basin, an Atlantic river basin in the Iberian Peninsula, where a spatial segregation of two divergent lineages was previously reported, based on isozyme, microsatellite and mtDNA data. In these studies, two divergent pure regions (Pisuerga and Lower-course) and several hybrid populations between them were identified. Morphological variation was evaluated in 11 populations representative of the genetic differentiation previously observed in the Duero basin, using multivariate analysis on 12 morphometric and 4 meristic traits. A large differentiation between populations was observed (interpopulation component of variance: 41.8%), similar to that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brown trout; Secondary contact; Morphometric; Meristic; Multivariate analysis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100007
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Pit telemetry as a method to study the habitat requirements of fish populations. Application to native and stocked trout movements IPB - Escola Superior Agrária
Teixeira, Amílcar; Cortes, R..
Passive integrated transponder (PIT) technology was used to study the behaviour of fishes during the summer season in two headwater streams of northeastern Portugal. A total of 71 PIT tags (12 mm long x 2.1 mm diameter) were surgically implanted in 1+ stocked (39) and native (32) brown trout of two size classes (< 20.0 and ≥ 20.0 cm). Eight independent antennae, connected to a multi-point decoder (MPD reader) unit, were placed in different microhabitats, selected randomly every three days during the observation period (29 August to 9 September in Baceiro stream and 19 September to 4 October in Sabor stream). The results confirmed this method as a suitable labour efficient tool to assess the movement and habitat use of sympatric stocked and native trout...
Tipo: ConferenceObject Palavras-chave: PIT tag; Brown trout; Stocking; Habitat use; Movement.
Ano: 2005 URL: http://hdl.handle.net/10198/5301
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PIT telemetry as a method to study the habitat requirements of fish populations: application to native and stocked trout movements IPB - Escola Superior Agrária
Teixeira, Amílcar; Cortes, R..
Passive integrated transponder (PIT) technology was used to study the behaviour of fishes during the summer season in two headwater streams of northeastern Portugal. A total of 71 PIT tags (12 mm long x 2.1 mm diameter) were surgically implanted in 1+ stocked (39) and native (32) brown trout of two size classes (< 20.0 and ≥ 20.0 cm). Eight independent antennae, connected to a multi-point decoder (MPD reader) unit, were placed in different microhabitats, selected randomly every three days during the observation period (29 August to 9 September in Baceiro stream and 19 September to 4 October in Sabor stream). The results confirmed this method as a suitable labour efficient tool to assess the movement and habitat use of sympatric stocked and native trout...
Tipo: Article Palavras-chave: PIT tag; Brown trout; Stocking; Habitat use; Movement.
Ano: 2007 URL: http://hdl.handle.net/10198/984
Registros recuperados: 9
Primeira ... 1 ... Última
 

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