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Registros recuperados: 9
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Associations between tissue fatty acid composition and physiological traits of performance and metabolism in the seabass (Dicentrarchus labrax) ArchiMer
Chatelier, Aurelien; Mckenzie, David; Prinet, Aurelie; Galois, Robert; Robin, Jean; Zambonino, Jose-luis; Claireaux, Guy.
Seabass were fed for 4 months with diets where the lipid was provided as either canola oil (CO), palm oil ( PO) or fish oil (FO), to generate diversity in their tissue fatty acid (FA) composition and investigate how this influenced major traits of exercise performance, cardiac performance and respiratory metabolism. In particular, based upon previous observations, we investigated the hypothesis that enriching the fish tissues with oleic and linoleic acids (OA, 18:1n-9 and LA, 18:2n-6, respectively) from the CO and PO diets would improve maximum exercise and cardiac performance, and increase aerobic metabolic scope. This proved to be the case; exercise respirometry on bass fitted with cardiac flow probes revealed that those fed CO and PO diets had a...
Tipo: Text Palavras-chave: Diet; Fatty acid; Cardiovascular performance; Metabolism; Swimming; Dicentrarchus labrax; Seabass.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1860.pdf
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Conservation physiology of marine fishes: state of the art and prospects for policy ArchiMer
Mckenzie, David; Axelsson, Michael; Chabot, Denis; Claireaux, Guy; Cooke, Steven J.; Corner, Richard A.; De Boeck, Gudrun; Domenici, Paolo; Guerreiro, Pedro M.; Hamer, Bojan; Jorgensen, Christian; Killen, Shaun S.; Lefevre, Sjannie; Marras, Stefano; Michaelidis, Basile; Nilsson, Goran E.; Peck, Myron A.; Perez-ruzafa, Angel; Rijnsdorp, Adriaan D.; Shiels, Holly A.; Steffensen, John F.; Svendsen, Jon C.; Svendsen, Morten B. S.; Teal, Lorna R.; Van Der Meer, Jaap; Wang, Tobias; Wilson, Jonathan M.; Wilson, Rod W.; Metcalfe, Julian D..
The state of the art of research on the environmental physiology of marine fishes is reviewed from the perspective of how it can contribute to conservation of biodiversity and fishery resources. A major constraint to application of physiological knowledge for conservation of marine fishes is the limited knowledge base; international collaboration is needed to study the environmental physiology of a wider range of species. Multifactorial field and laboratory studies on biomarkers hold promise to relate ecophysiology directly to habitat quality and population status. The 'Fry paradigm' could have broad applications for conservation physiology research if it provides a universal mechanism to link physiological function with ecological performance and...
Tipo: Text Palavras-chave: Biomarkers; Ecological models; Fisheries; Fry paradigm; Individual variation; Telemetry.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00616/72841/72999.pdf
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Effects of oleic acid on the high threshold barium current in seabass Dicentrarchus labrax ventricular myocytes ArchiMer
Chatelier, Aurelien; Imbert, Nathalie; Zambonino, Jose-luis; Mckenzie, David; Bois, P.
The present study employed a patch clamp technique in isolated seabass ventricular myocytes to investigate the hypothesis that oleic acid (OA), a mono-unsaturated fatty acid, can exert direct effects upon whole-cell barium currents. Acute application of free OA caused a dose-dependent depression of the whole-cell barium current that was evoked by a voltage step to 0 mV from a holding potential of -80 mV. The derived 50% inhibitory concentration (IC50) was 12.49 +/- 0.27 mu mol l(-1). At a concentration of 30 mu mol l(-1), OA significantly reduced the current density to about 45% of control values, but did not modify either the shape of the current-density voltage relationship or the apparent reversal potential. In addition, OA did not modify the voltage...
Tipo: Text Palavras-chave: Fatty acid; Sea bass; Ventricular myocyte; L type calcium channel; Oleic acid.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2120.pdf
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Effects of water viscosity upon ventilation and metabolism of a flatfish, the common sole Solea solea (L.) ArchiMer
Couturier, Christine; Rouault, Alice; Mckenzie, David; Galois, Robert; Robert, Serge; Joassard, Lucette; Claireaux, Guy.
The French Atlantic coast contains large highly productive intertidal mudflats that are colonised by juveniles of numerous flatfish species, including the common sole (Solea solea, L.). These ecosystems are also heavily exploited by the shellfish farming industry. Intensive bivalve culture is associated with substantial biodeposition (1-6 t-dw ha(-1) day(-1)), which directly or indirectly contributes to increase exopolysaccharide (EPS) concentrations at the interface between water column and seabed. EPS are long-chain molecules organised into colloids, which influence rheological properties of water, particularly viscosity. Increased water viscosity had consequences for ventilatory activity of juvenile flatfish, whereby the minimal pressure required to...
Tipo: Text Palavras-chave: EPS; Hypoxia; Metabolism; Water viscosity; Biodeposition; Solea solea.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2801.pdf
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Food in the Sea: Size Also Matters for Pelagic Fish ArchiMer
Queiros, Quentin; Fromentin, Jean-marc; Gasset, Eric; Dutto, Gilbert; Huiban, Camille; Metral, Luisa; Leclerc, Lina; Schull, Quentin; Mckenzie, David; Saraux, Claire.
Small pelagic fish are key components of marine ecosystems and fisheries worldwide. Despite the absence of recruitment failure and overfishing, pelagic fisheries have been in crisis for a decade in the Western Mediterranean Sea because of a marked decline in sardine size and condition. This situation most probably results from bottom-up control and changes in the plankton community toward smaller plankton. To understand such an unusual phenomenon, we developed an original and innovative experimental approach investigating the mechanisms induced by a reduction in the quantity and size of sardine prey. While experimentations offer the unique opportunity to integrate behavior and ecophysiology in understanding key demographic processes, they remain rarely...
Tipo: Text Palavras-chave: Experimentation; Small pelagics; Sardina pilchardus; Body condition; Bottom-up control.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61669/65585.pdf
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Linking swimming performance, cardiac pumping ability and cardiac anatomy in rainbow trout ArchiMer
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
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Physiological mechanisms underlying a trade-off between growth rate and tolerance of feed deprivation in the European sea bass (Dicentrarchus labrax) ArchiMer
Dupont-prinet, A.; Chatain, Beatrice; Grima, L.; Vandeputte, Marc; Claireaux, Guy; Mckenzie, David.
The specific growth rate (SGR) of a cohort of 2000 tagged juvenile European sea bass was measured in a common tank, during two sequential cycles comprising three-weeks feed deprivation followed by three-weeks ad libitum re-feeding. After correction for initial size at age as fork length, there was a direct correlation between negative SGR (rate of mass loss) during feed deprivation and positive SGR (rate of compensatory growth) during re-feeding (Spearman rank correlation R=0.388, P=0.000002). Following a period of rearing under standard culture conditions, individuals representing 'high growth' phenotypes (GP) and 'high tolerance of feed deprivation' phenotypes (DP) were selected from either end of the SGR spectrum. Static and swimming respirometry could...
Tipo: Text Palavras-chave: Aerobic scope; Compensatory growth; Specific dynamic action; Specific growth rate; Standard metabolic rate.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11283/8517.pdf
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Reflex cardioventilatory responses to hypoxia in the flathead gray mullet (Mugil cephalus) and their behavioral modulation by perceived threat of predation and water turbidity ArchiMer
Shingles, A; Mckenzie, David; Claireaux, Guy; Domenici, P.
In hypoxia, gray mullet surface to ventilate well-oxygenated water in contact with air, an adaptive response known as aquatic surface respiration (ASR). Reflex control of ASR and its behavioral modulation by perceived threat of aerial predation and turbid water were studied on mullet in a partly sheltered aquarium with free surface access. Injections of sodium cyanide (NaCN) into either the bloodstream ( internal) or ventilatory water stream ( external) revealed that ASR, hypoxic bradycardia, and branchial hyperventilation were stimulated by chemoreceptors sensitive to both systemic and water O-2 levels. Sight of a model avian predator elicited bradycardia and hypoventilation, a fear response that inhibited reflex hyperventilation following external NaCN....
Tipo: Text Palavras-chave: Oxygen; Channel Catfish; Neotropical Fish; Cardiorespiratory Reflexes; Air Breathing Fish; Tambaqui Colossoma Macropomum; Salmon Oncorhynchus Tshawytscha; Aquatic Surface Respiration.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-637.pdf
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Relationships among Traits of Aerobic and Anaerobic Swimming Performance in Individual European Sea Bass Dicentrarchus labrax ArchiMer
Marras, Stefano; Killen, Shaun S.; Domenici, Paolo; Claireaux, Guy; Mckenzie, David.
Teleost fishes exhibit wide and temporally stable inter-individual variation in a suite of aerobic and anaerobic locomotor traits. One mechanism that could allow such variation to persist within populations is the presence of tradeoffs between aerobic and anaerobic performance, such that individuals with a high capacity for one type of performance have a reduced capacity for the other. We investigated this possibility in European seabass Dicentrarchus labrax, each measured for a battery of indicators of maximum locomotor performance. Aerobic traits comprised active metabolic rate, aerobic scope for activity, maximum aerobic swimming speed, and stride length, using a constant acceleration test. Anaerobic traits comprised maximum speed during an escape...
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00163/27444/25665.pdf
Registros recuperados: 9
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