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Registros recuperados: 47
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A simple way of avoiding feed wastage in European seabass, Dicentrarchus labrax, under self-feeding conditions ArchiMer
Coves, Denis; Gasset, Eric; Lemarie, Gilles; Dutto, Gilbert.
Self-feeding systems allow fish to freely express feeding activity. A simple rod at the water surface can act as a trigger and provide fish with a way of obtaining pellets from a feeder. Such a rod presented to experienced European seabass, Dicentrarchus labrax, may lead to feed wastage, probably as a result of unintentional fish contacts with the trigger. Trigger protection screens have been designed to prevent fish contacting the trigger by chance, and the efficacy of such screens was tested. Nocturnal and diurnal feed delivery and feed wasted were compared under conditions where the rod was unprotected or protected by semi-cylindrical or cylindrical screens. Tests were conducted using an unrestricted self-feeding regime (reward: 0.2 g pellet per kg of...
Tipo: Text Palavras-chave: Feeding behaviour; Feed wastage; Self feeding; Fish culture; Comportement alimentaire; Gaspillage d'aliment; Auto alimentation; Élevage de poissons.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-867.pdf
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A spatiotemporal study of bacterial community profiles associated with Atlantic bluefin tuna larvae, Thunnus thynnus L., in three Mediterranean hatcheries ArchiMer
Gatesoupe, Joel; Coves, Denis; Ortega, Aurelio; Papandroulakis, Nikos; Vadstein, Olav; De La Gandara, Fernando.
During the first 2 years of larval rearing trials with Atlantic bluefin tuna, survival was a challenging issue. As bacterial colonization of the gut has been shown to play a key role for other species, we studied the profiles of the microbiota associated with individual larvae at different stages in three distant hatcheries. The Bacterial Community Profile (BCP) was quantified based on PCR-DGGE analyses of partial amplicons from 16S rDNA. Considerable individual variability in BCP was observed before onset of feeding, and the BCP did not show regular fluctuation during ontogenesis. Microalgae were added to the rearing tanks in two of the three hatcheries, but it was not possible to distinguish the effect of location from the effect of algal addition on...
Tipo: Text Palavras-chave: Larval rearing; Bacterial diversity; DGGE; Thunnus thynnus.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00075/18648/16197.pdf
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Améliorations récentes des techniques d'élevages et de la qualité des animaux produits en écloserie de loup, Dicentrarchus labrax ArchiMer
Coves, Denis.
Tipo: Text
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00142/25313/23390.pdf
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Behavioral and neurophysiological responses of European sea bass (Dicentrarchus labrax) groups reared under food constraint ArchiMer
Di-poi, Carole; Attia, Joël; Bouchut, Colette; Dutto, Gilbert; Coves, Denis; Beauchaud, Marilyn.
Tipo: Text
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00346/45753/45395.pdf
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Behavioral and neurophysiological responses of European sea bass groups reared under food constraint ArchiMer
Di Poi, Carole; Attia, J; Bouchut, C; Dutto, Gilbert; Coves, Denis; Beauchaud, M.
The individual food-demand behavior of juvenile European sea bass (Dicentrarchus labrax, L.) reared in groups under self-feeding conditions was investigated. The triggering activity on self-feeder, i.e. index of the food-demand activity, agonistic interactions and territorial behavior were monitored for periods of 42 to 68 days in six groups of 50 fish. The specific growth rate was calculated and the brain serotonergic activity was used as a stable index of social stress. Inter-individual differences appeared in triggering activity and three groups were distinguished: 3-5 high-triggering fish, 17-30 low-triggering fish and the remaining individuals were null-triggering fish. There were no significant differences in specific growth rates calculated at the...
Tipo: Text Palavras-chave: Social stress; Brain serotonergic activity; Territorial behavior; Agonistic interactions; Self feeding; European sea bass; Triggering activity; Food demand behavior.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2637.pdf
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Caractérisation de la qualité du platax (Platax orbicularis) issu d’aquaculture : transformation - composition chimique - caractérisation sensorielle ArchiMer
Knockaert, Camille; Cornet, Josiane; Cardinal, Mireille; Gasset, Eric; Maamaatuaiahutapu, Moana; Coves, Denis.
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00058/16917/14396.pdf
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Cloning and retinal expression of melatonin receptors in the European sea bass, Dicentrarchus labrax ArchiMer
Sauzet, S; Besseau, L; Perez, P; Coves, Denis; Chatain, Beatrice; Peyric, E; Boeuf, G; Munoz Cueto, J; Falcon, J.
Melatonin contributes to synchronizing behaviors and physiological functions to daily and seasonal rhythm in fish. However, no coherent vision emerges because the effects vary with the species, sex, moment of the year or sexual cycle. And, scarce information is available concerning the melatonin age, receptors, which is crucial to our understanding of the role melatonin plays. We report here the full length cloning of three different melatonin receptor subtypes in the sea bass Dicentrarchus labrax, belonging, respectively, to the MT1, MT2 and Mellc subtypes. MT1, the most abundantly expressed, was detected in the central nervous system, retina, and gills. MT2 was detected in the pituitary gland, blood cells and, to a lesser extend, in the optic tectum,...
Tipo: Text Palavras-chave: Retina; Melatonin receptors; Sea bass.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4513.pdf
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Culture of sea bass (Dicentrarchus labrax L) ArchiMer
Coves, Denis; Dewavrin, Guirrec; Breuil, Gilles; Devauchelle, Nicole.
Tipo: Text
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00049/16021/13482.pdf
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Current status of the French intensive larval rearing techniques for sea bass (Dicentrarchus labrax) & sea bream (Sparus auratus) ArchiMer
Chatain, Beatrice; Coves, Denis.
Tipo: Text
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00364/47486/47777.pdf
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Development of the posterior lateral line system in Thunnus thynnus, the atlantic blue-fin tuna, and in its close relative Sarda sarda ArchiMer
Ghysen, Alain; Schuster, Kevin; Coves, Denis; De La Gandara, Fernando; Papandroulakis, Nikos; Ortega, Aurelio.
The lateral line system of amphibians and fish comprises a large number of individual mechanosensory organs, the neuromasts, and their sensory neurons. The pattern of neuromasts varies markedly between species, yet the embryonic pattern is highly conserved from the relatively basal zebrafish, Danio rerio, to more derived species. Here we examine in more detail the development of the posterior lateral line (PLL) in embryos and early larvae of one of the most derived fish species, the blue-fin tuna Thunnus thynnus, and of its close relative, the Atlantic bonito Sarda sarda. WE! show that the basic features of embryonic PLL development, including the migratory properties of the PLL primordium, the patterning of neuromasts and their innervation, are largely...
Tipo: Text Palavras-chave: Neuromast; Hair cell; Planar polarity; Cupula; Migrating primordium.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13032/10162.pdf
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Developmental origin of a major difference in sensory patterning between zebrafish and bluefin tuna ArchiMer
Ghysen, Alain; Dambly-chaudiere, Christine; Coves, Denis; De La Gandara, Fernando; Ortega, Aurelio.
The posterior lateral line system (PLL) of teleost fish comprises a number of mechanosensory organs arranged in defined patterns on the body surface. Embryonic patterns are largely conserved among teleosts, yet adult patterns are highly diverse. Although changes in pattern modify the perceptual abilities of the system, their developmental origin remains unknown. Here we compare the processes that underlie the formation of the juvenile PLL pattern in Thunnus thynnus, the bluefin tuna, to the processes that were elucidated in Danio rerio, the zebrafish. In both cases, the embryonic PLL comprises five neuromasts regularly spaced along the horizontal myoseptum, but the juvenile PLL comprises four roughly parallel anteroposterior lines in zebrafish, whereas it...
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00077/18777/16357.pdf
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Dietary lipid level affects fatty acid composition and hydrolase activities of intestinal brush border membrane in seabass ArchiMer
Cahu, Chantal; Zambonino, Jose-luis; Corraze, Genevieve; Coves, Denis.
Triplicate groups of juvenile seabass (initial weight of 241 g) were fed during 13 weeks three isonitrogenous experimental diets containing different lipid levels, 12% (LL group), 21% (ML group) and 30% (HL group). At the end of the experiment, fish weight gain was similar among the 3 dietary groups. Intestinal brush border membranes were purified for each dietary group; one part of the brush border fraction was dedicated to enzyme assays, the remaining fraction being used for lipid extraction followed by fatty acid analysis. The fatty acid composition of the brush border membrane differed among the 3 groups, although the 3 experimental diets had the same fatty acid composition. The increase in dietary lipid level resulted in a lowering in (n-3)...
Tipo: Text Palavras-chave: Membrane lipid; Intestine; Fish; Fatty acids; Dietary lipids; Brush border hydrolases.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-901.pdf
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Effect of chronic ammonia exposure on growth of European seabass (Dicentrarchus labrax) juveniles ArchiMer
Lemarie, Gilles; Dosdat, Antoine; Coves, Denis; Dutto, Gilbert; Gasset, Eric; Person, Jeannine.
Chronic effects of ammonia were studied in juvenile seabass, Dicentrarchus labrax (mean weight= 11 g), exposed for 63 days to eight stable ammonia concentrations, ranging from 0.24 to 0.90 mg l(-1) unionised ammonia nitrogen (UIA-N), respectively, from 6.1 to 22.3 mg l(-1) total ammonia nitrogen (TA-N). Temperature (21.8 degreesC), pH (8.0), salinity (37.0 ppt), and oxygen concentration (over 80% saturation at the outlet) were maintained constant. Fish were fed using a self-feeder device, and they were starved during the last 8 days. Mortality of 28.9 and 42.6% occur-red within the first 8 days at the two highest UIA-N concentrations, respectively, 0.90 and 0.88 mg l(-1). From days 0 to 55, a 1.8-fold increase in weight gain was observed under the 0.90-mg...
Tipo: Text Palavras-chave: Plasma ammonia; Growth; Seabass; Chronic toxicity; Ammonia.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-628.pdf
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Effect of chronic exposure to ammonia on growth, food utilisation and metabolism of the European sea bass (Dicentrarchus labrax) ArchiMer
Dosdat, Antoine; Person, Jeannine; Coves, Denis; Dutto, Gilbert; Gasset, Eric; Le Roux, Annick; Lemarie, Gilles.
The chronic effects of exposing sea bass (average initial weight 100 g) to ammonia in water at 22 degreesC were first evaluated over a 61-day period (period 1, P1) during which nine different groups were submitted to nine ambient ammonia levels ranging from 0.014 to 0.493 mg 1(-1) NH3-N (0.53-16.11 mg 1(-1) total ammonia nitrogen (TA-N)) and fed using self-feeders. At the end of P1, the fish were starved for 10 days (P2). Their recovery capacity was tested over 43 days (P3) after which the exogenous ammonia supply was stopped in all treatments and the fish were allowed to feed. After 20 days of exposure a highly significant effect of ammonia was evident from the decrease in feeding activity, voluntary feed intake (VFI) and specific growth rate (SGR), and...
Tipo: Text Palavras-chave: Sea bass; Self feeding; Compensatory growth; Chronic toxicity; Ammonia.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-595.pdf
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Effects of high food-demand fish removal in groups of juvenile sea bass (Dicentrarchus labrax) ArchiMer
Di Poi, C; Beauchaud, M; Bouchut, C; Dutto, Gilbert; Coves, Denis; Attia, J.
In self-feeding conditions, a few individual sea bass (Dicentrarchus labrax (L., 1758)) display strong activity in striking the food dispenser, whereas the remaining individuals of the group actuate the feeder weakly or never. Here, we investigated the effects of removal of the individuals showing dominant activity on the social and feeding behaviours in groups of juvenile sea bass. Following removal, new fish showing a dominant self-feeding activity quickly appear. They always come from the group of fish that have a low number of triggering actuations. This observation shows that it takes less time, about 5 days after the removal of dominant triggerers vs. 14 days at the beginning, for the re-establishment of the behavioural structure, suggesting the...
Tipo: Text
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4766.pdf
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Effet du ratio lipides/protéines de l'aliment sur la croissance de l'ombrine ocellée (Sciaenops ocellatus) et sur les rejets biologiques ArchiMer
Faure, Leslie; Regina, Françoise; Dutto, Gilbert; Falguiere, Jean-claude; Coves, Denis; Cahu, Chantal.
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20947/18566.pdf
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Elevage intensif du loup Dicentrarchus labrax ArchiMer
Coves, Denis; Gasset, Eric.
Different seabass (Dicentrarchus labrax) intensiv rearing technics have been experimented in the pilot scale unit of our laboratory. During these upscalfing operation, the results obtained allow us to compare costs related to each fingemng production method. Closed system combined with early weaning with an efficient micropellet saves at least 69 % of direct production costs by comparison with an open system with Arternia during larval phase. However if closed systems are commonly used by private hatcheries, larval micropellets are always at experimental step.
Tipo: Text Palavras-chave: Production cost; Early weaning; Closed system; Intensiv; Rearing; D. Labrax; Coût de production; Sevrage précoce; Recyclage; Intensif; Elevage; D. Labrax.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/rapport-1916.pdf
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Elevage larvaire du turbot (Scophtalmus maximus) en circuit fermé grande échelle ArchiMer
Gasset, Eric; Coves, Denis.
Tipo: Text
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00279/38997/37562.pdf
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Evaluation des rejets biologiques de juvéniles de platax (Platax orbicularis) : approche méthodologique ArchiMer
Colleter, Julie; Gasset, Eric; Buchet, Vincent; Coves, Denis.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00020/13174/10232.pdf
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Fiche technique. La nouvelle génération d'incubateur autonome fonctionnant en circuit fermé : une nouvelle étape dans la fiabilité et le contôle zoosanitaire de l'élevage des poissons marins ArchiMer
Coves, Denis; Bouget, Jean-francois.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00342/45330/44790.pdf
Registros recuperados: 47
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