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Registros recuperados: 26
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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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Amélioration des techniques d'élevage de la chevrette Macrobrachium rosenbergii en Guyane ArchiMer
Griessinger, Jean-michel; Gondouin, Philippe; Dutto, Gilbert; Lacroix, Denis; Pollet, Thierry; Falguiere, Jean-claude; Mer, Gilles.
En 1987, l'analyse du système d'élevage en continu menée par l' IFREMER tant sur les fermes guyanaises que sur la station expérimentale de Kourou a permis de mettre en évidence les limites et les faiblesses de ce mode d'élevage. Elle a montré la nécessité d'un meilleur contrôle du cheptel depuis l'ensemencement jusqu'à la commercialisation afin de pouvoir atteindre de manière fiable des rendements de l'ordre de 2,5 T/ha/an.
Tipo: Text Palavras-chave: Elevage; Chevrette; Macrobrachium rosenbergii; Guyane; Zootechnie; Production; Grow-out; Freshwater prawn; Macrobrachium rseenbergii; French Guiana; Production.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00041/15266/12618.pdf
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Amélioration des techniques d'élevage de la chevrette Macrobrachium rosenbergii en Guyane (programme pluri-annuel 1988-1990). 2ème volet : années 1989-1990 ArchiMer
Griessinger, Jean-michel; Gondouin, Philippe; Dutto, Gilbert; Lacroix, Denis; Pollet, Thierry; Falguiere, Jean-claude; Mer, Gilles.
Le programme d'amélioration des techniques d'élevage de la Chevrette Macrobrachium rosenbergii en Guyane constitue la deuxième phase du programme d'expérimentation mené sur la station IFREMER de Kourou. Jusqu'en 1988, l'effort a porté sur l'analyse du système continu classique utilisé par l'ensemble des producteurs de Macrobrachium aux Antilles et en Guyane. A partir de 1988, il apparut que la résolution des problèmes posés par son application passait par l'utilisation de schémas de gestion de la population en mode discontinu. Les expérimentations ont donc porté sur les principales conditions d'élevage susceptibles d'améliorer l'efficacité du schéma d'exploitation de la population. En prégrossissement, il s'agissait d'obtenir le meilleur compromis...
Tipo: Text Palavras-chave: Elevage; Chevrette; Macrobrachium; Guyane; Zootechnie; Production.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00041/15262/12611.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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Dimorphisme de croissance et mise en évidence d'effets familiaux chez l'ombrine ocellée, Sciaenops ocellatus, en Martinique ArchiMer
Rodriguez, Julien; Connan, Jean-paul; Dutto, Gilbert; Petton, Bruno; Falguiere, Jean-claude.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00020/13171/10229.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 alterations of proteins and immunoglobulins in sea bass (Dicentrarchus labrax) serum ArchiMer
Coeurdacier, Jean-luc; Dutto, Gilbert.
The relationship between serum protein, immunoglobulin concentrations and protein molecular weight profile (PMWP) alterations of sea bass (131.3 +/- 4.3 g) reared in sea water with sublethal concentrations of ammonia was studied over two periods totalling 116 days. During the exposure period (62 days) the first group (group 1) lived in sea water with 0.204 mg.L-1 unionized ammonia nitrogen equivalent to 12 % of the lethal concentration for 50 % of a population exposed for 96 h to ammonia (96-h LC50), whilst the second group (group 2) lived in sea water with 0.340 mg.L-1 UIA-N equivalent to 20 % of the 96-h LC50 of ammonia. Then, the two groups were left for a recovery period (54 days) in the same water as the control group (group 0). The determination of...
Tipo: Text Palavras-chave: Dicentrarchus labrax; Fish culture; Proteins; Immunoglobulin; Sublethal toxicity; Ammonia; Dicentrarchus labrax; Poisson d'élevage; Protéine; Immunoglobuline; Toxicité sublétale; Ammoniaque.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-858.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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Effects of rearing density on sea bass (Dicentrarchus labrax) biological performance, blood parameters and disease resistance in a flow through system ArchiMer
Roque D'Orbcastel, Emmanuelle; Lemarie, Gilles; Breuil, Gilles; Petochi, Tommaso; Marino, Giovanna; Triplet, Sebastien; Dutto, Gilbert; Fivelstad, Sveinung; Coeurdacier, Jean-luc; Blancheton, Jean-paul.
During 84 days, the effects of density on juvenile sea bass (Dicentrarchus labrax) (76 +/- 16 g) were studied in an experimental tank-based flow through system. Performance, stress response and resistance to virus infection were analysed under five stabilized rearing densities: 10, 20, 40, 70 and 100 kg m(-3). Water quality parameters (CO2, total ammonia nitrogen and O-2) were measured and maintained close to the recommended values for farmed sea bass by adjusting water renewal exchange. No significant differences were observed between density treatments, neither on stress response (cortisol) nor susceptibility to nodavirus. With regards to biological performances, the daily feed intake and specific growth rate were significantly lower in fish reared at...
Tipo: Text Palavras-chave: Rearing density; Flow through system; Stress; Water quality; Sea bass.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11287/7824.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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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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Influence of an environmental parameter in seabass (Dicentrarchus labrax L.) voluntary feed intake in intensive production system. General experimental designe illustrated by the example of water ammonia nitrogen level action ArchiMer
Coves, Denis; Gasset, Eric; Lemarie, Gilles; Dutto, Gilbert.
Tipo: Text
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00317/42853/42268.pdf
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Is total serum protein a good indicator for welfare in reared sea bass (Dicentrarchus labrax)? ArchiMer
Coeurdacier, Jean-luc; Dutto, Gilbert; Gasset, Eric; Blancheton, Jean-paul.
Reared sea bass were submitted to six stressful situations: hyperoxia with or without hypercapnia, increased stocking density in an open flow or recirculating system, transfer to another tank and nodavirus injection. The potentially negative impact of these factors on the lives of sea bass was investigated by measuring 9 water parameters and 19 fish parameters including total serum protein (TSP). TSP has already been used to evaluate stress. The present study investigates data of previous and new experiments, concentrating on the potential use of TSP as a routine indicator to assess welfare in sea bass reared on fish farms. In the current experiment, oxygen and carbon dioxide were seen to affect levels of TSP, but alterations were too erratic to enable...
Tipo: Text Palavras-chave: Fish stress; Fish welfare; Protein; Serum; Fish transfer; Nodavirus; Sea bass.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15382/12740.pdf
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Lenght-weight relationship adapted to freshwater prawn Macrobrachium rosenbergii morphological types ArchiMer
Mer, Gilles; Falguiere, Jean-claude; Lacroix, Denis; Gondouin, Philippe; Dutto, Gilbert.
Tipo: Text
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00040/15169/12506.pdf
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Long-term monitoring of individual fish triggering activity on a self-feeding system: An example using European sea bass (Dicentrarchus labrax) ArchiMer
Coves, Denis; Beauchaud, M; Attia, J; Dutto, Gilbert; Bouchut, C; Begout, Marie-laure.
In two experiments, a computerized on-demand feeding system coupled with a PIT tag monitoring device was used to continuously record the triggering activity by ca. 50 individual sea bass for 55 days (Exp. 1, initial average body weight and coefficient of variation, CV: 299 g, 15%) and 69 days (Exp. 2, 157 g, 13%). Each group was stocked in 1 m(3) tanks and exposed to a water temperature of 21 +/- 1 degrees C and a light regime of 16:8 LD. Only 5% of the triggering activity was not associated with simultaneous PIT tag detection. Although each individual was detected via PIT tag during the experiment, only 67% and 74% of the fish actuated the trigger at least once in Exp. 1 and Exp. 2, respectively. Moreover, only two fish in Exp. 1 and one fish in Exp. 2...
Tipo: Text Palavras-chave: PIT tag detection antenna; Individual triggering activity; Self feeding; Sea bass.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1341.pdf
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Mécanisme d'apparition de la vessie natatoire chez les larves d'ombrine ocellée (Sciaenops ocellatus) et de platax (Platax orbicularis) ArchiMer
Dutto, Gilbert; Gasset, Eric; Falguiere, Jean-claude; Bompas, Gregory; Connan, Jean-paul; Coves, Denis.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00020/13167/10225.pdf
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Nitrogenous and phosphorous waste production in a flow-through land-based farm of European seabass (Dicentrarchus labrax) ArchiMer
Lemarie, Gilles; Martin, Jean-louis; Dutto, Gilbert; Garidou, C.
A study on nitrogenous and phosphorous waste production in European seabass (Dicentrarchus labrax) was carried out in a flow-through land-based farm. The main objectives were (i) to calculate nitrogenous (N) and phosphorous (P) waste production (particulate and dissolved) from in situ measurements for different rearing ponds with specific fish biomasses, fish sizes and flow rates, (ii) to establish nitrogenous and phosphorous waste production budgets, ratios and equations, and (iii) to compare, for the whole farm, in situ measurements to estimate N and P waste production from waste equations. Waste production was manifest by an increase in concentrations of total ammonia nitrogen, total Kjeldhal nitrogen, particulate nitrogen, dissolved phosphorus and...
Tipo: Text Palavras-chave: Fish farm waste; Excretion; Nitrogenous budget; Phosphorous budget; Dicentrarchus labrax.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-872.pdf
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No efficiency of the lateral system on nocturnal feeding in the European sea bass (Dicentrarchus labrax L.) ArchiMer
Faucher, Karine; Dutto, Gilbert; Coves, Denis; Aubert, Anne; Lagardere, Jean-paul.
In order to evaluate the effect and consequence of lateral system inactivation on fish nocturnal feeding, the differential growth of groups of European sea bass maintained in different rearing conditions were compared. Whereas some fish with intact lateral system (placebo fish) were placed under a photoperiod of 12-L: 12-D, other placebo fish were kept in the dark. In the same way, fish deprived of lateral system by section of their lateral system nerves and antibiotic treatment were placed under a photoperiod of 12-L: 12-D and the others in the dark. For each of these four rearing conditions, two sets of experiment were realized. Percent mortality, feed rhythm, averaged daily feed demand, specific growth rate and feed efficiency were compared among these...
Tipo: Text Palavras-chave: Feed efficiency; Growth; Nocturnal feeding; Photoperiod; Lateral system; European sea bass.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2267.pdf
Registros recuperados: 26
Primeira ... 12 ... Última
 

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