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| Registros recuperados: 19 | |
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| Moreau, Yann. |
| La couverture des besoins énergétiques alimentaires a été étudiée chez des poissons tropicaux utilisés en aquaculture et connus pour leur meilleure utilisation de l'énergie non-protéique. Ces besoins ont été évalués, et l'utilisation de l'amidon évaluée comme source potentielle d'énergie alimentaire. Les besoins ont été déterminés en fournissant des rations croissantes d'un aliment unique, riche en protéines, ne pouvant avoir d'effet limitant. L'utilisation de l'amidon a été étudiée par calorimétrie indirecte et tests de croissance. La mise au point de la purification des amylases digestives chez 2 tilapias a permis d'étudier leurs caractéristiques et de les comparer entre elles ou à celles du pancréas de porc. La méthode proposée a permis la détermination... |
| Tipo: Text |
Palavras-chave: PISCICULTURE; POISSON D'EAU DOUCE; BESOIN NUTRITIONNEL; VALEUR ENERGETIQUE; DEPENSE ENERGETIQUE; AMIDON; HYDROLYSE; ENZYME; PROTEINE; ETUDE EXPERIMENTALE. |
| Ano: 2001 |
URL: http://www.documentation.ird.fr/hor/fdi:010025474 |
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| Boujard, T.; Moreau, Yann; Luquet, Pierre. |
| Low intensity colored light is very often used to observe or manipulate fish during the scotophase. According to data on fish vision, most species can perceive these wavelengths of light since their cone pigments have maximum absorption peaks around 455, 530 and 625 nm. To test whether #Hoplosternum littorale$ can detect low intensity red or blue light, we attempted to entrain feeding activity, known to be nocturnal and synchronized by the circadian light/dark alternation, to such light. Feeding activity was entrained with either red or blue light, indicating that these fish can perceive these lights. In all cases, the fish fed during the darker phase of the light cycle. (Résumé d'auteur) |
| Tipo: Text |
Palavras-chave: POISSON D'EAU DOUCE; ETHOLOGIE; NUTRITION ANIMALE; EXPERIMENTATION; RYTHME BIOLOGIQUE; VARIATION TEMPORELLE; INTENSITE LUMINEUSE; RELATION ESPECE ENVIRONNEMENT. |
| Ano: 1992 |
URL: http://www.documentation.ird.fr/hor/fdi:40468 |
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| Moreau, Yann; Médale, F.; Boujard, T.; Luquet, Pierre. |
| Metabolic utilization of energy substrates by a tropical catfish species, #Hoplosternum littorale$, was investigated. Both endogenous and exogenous substrates were considered, either through analysis of whole body losses during long term starvation, or through indirect calorimetric measurements. Results show that utilization of fats, during long term starvation, was not related to their body concentration. Even if most of the energy is provided by proteins, as for temperate species, carbohydrates could be used as far as they remain available. Therefore, carbohydrates metabolism seems to be active in "Atipa". (Résumé d'auteur) |
| Tipo: Text |
Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; METABOLISME; BILAN ENERGETIQUE; NUTRITION ANIMALE; METHODOLOGIE; ANALYSE QUANTITATIVE; ANALYSE CALORIMETRIQUE; ATIPA. |
| Ano: 1993 |
URL: http://www.documentation.ird.fr/hor/fdi:40789 |
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| Moreau, Yann; Luquet, Pierre. |
| Le transit digestif a été étudié chez l'atipa, #Hoplosternum littorale$ (Siluriforme), pour définir un protocole de collecte des fèces, applicable à l'évaluation des coefficients de digestibilité apparente. On a suivi l'apparition des fèces après la prise d'un ou de plusieurs repas marqués avec du Cr2O3. La plupart des fèces correspondant à un repas sont évacuées dans les 24 heures. L'utilisation d'un deuxième marqueur, TiO2, montre que les premières fèces émises contiennent des résidus de repas de la veille (environ 5%). L'absorption d'un repas quelques heures avant le repas d'épreuve réduit le temps d'apparition des premières fèces. La période recommandée pour la collecte des fèces est située de 6 à 23 heures après la distribution de l'aliment. Cette... |
| Tipo: Text |
Palavras-chave: POISSON; ESPECE TROPICALE; DIGESTIBILITE; ALIMENTATION ANIMALE; MARQUAGE; ANALYSE QUANTITATIVE; ATIPA; TRANSIT DIGESTIF. |
| Ano: 1991 |
URL: http://www.documentation.ird.fr/hor/fdi:35865 |
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| Moreau, Yann. |
| This paper presents a review of the knowledge on the chemical mecanisms of digestion, feeding rates and the digestibility of natural food by African freshwater fish species. Most of the studies deal with cichlid fishes. Among them, stomach acid secretion is tied to feeding and contributes to the breakdown of algal walls or macrophyte cells. Pepsin, trypsin and chymotripsin are the main proteases which have been studied ... By comparing enzyme activity and feeding behavior, amylase activity is noticeably greater in herbivores rather than in carnivores. Such differences are less pronounced for the proteases ...Feeding patterns and gut passage or gastric evacuation times have been investigated to estimate daily digestion |
| Tipo: Text |
Palavras-chave: POISSON D'EAU DOUCE; PHYSIOLOGIE ANIMALE; ALIMENTATION ANIMALE; DIGESTION. |
| Ano: 1988 |
URL: http://www.documentation.ird.fr/hor/fdi:26394 |
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| Moreau, Yann. |
| Respiration of african freshwater fishes has not been largely studied. Main works deal with species of interest to aquaculture (mainly Cichlids) or species with some physiological peculiarities such as euryhalinity, from alkaline biotopes or which are air-breathing (Cichlids, catfishes, lungfishes, etc.). Two groups of factors may affect fish respiration. The first including temperature, salinity and body mass, changes oxygen consumption rates by varying the energy requirements of the fish. The second, mainly oxygen tension, limits the ability of fish to ensure the maintenance of basic oxygen requirements. A generalisation of the expression which models the relationships betwen oxygen consumption and body mass, has been proposed by Winberg (1960) |
| Tipo: Text |
Palavras-chave: POISSON D'EAU DOUCE; PHYSIOLOGIE ANIMALE; METABOLISME; RESPIRATION; TRANSFERT D'ENERGIE. |
| Ano: 1988 |
URL: http://www.documentation.ird.fr/hor/fdi:26393 |
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| Moreau, Yann; Medale, F.; Boujard, T.; Luquet, Pierre. |
| Indirect calorimetry method was used to measure postprandial utilization of energy substrates by atipa, #Hoplosternum littorale$ (#Callichthyidae$, Siluriform). A model was adjusted to the data on respiratory exchanges and nitrogen excretion for this purpose. As for other fish species, protein was actively catabolized after feeding during the 60 hr measurement time. As long as carbohydrates were available, atipa was also able to use these substrates for its energy metabolism. A gradual increase of contribution of lipids was then noticed. Over a 24 hr period following the food intake, a 30 g fish catabolized 90 mg of proteins and 43 mg of carbohydrates. At the same time, the results led to a synthesis of 3.7 mg of fat. An estimation of the increase of the... |
| Tipo: Text |
Palavras-chave: POISSON; ETHOLOGIE; NUTRITION ANIMALE; METABOLISME; RESPIRATION; EXCRETION; BILAN ENERGETIQUE; ANALYSE QUALITATIVE; ANALYSE QUANTITATIVE; MODELE; ANALYSE CALORIMETRIQUE. |
| Ano: 1992 |
URL: http://www.documentation.ird.fr/hor/fdi:40470 |
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| Le Thanh Hung; Lazard, J.; Tu, H.T.; Moreau, Yann. |
| Fish unlike terrestrial animals, use a large amount of protein as an energy source for their energy metabolism. When fed on a high protein raiton, the fish itself may choose which amount of protein in food will be converted into body growth and which will be burned through the catabolism. Therefore, in the study one diet was designed with a high protein content and fed to fish with different levels : 0, 5, 15, 25, 35 and 45 g crude protein kg/d. #P. bocourti$ has a higher growth rate than #P. hypophthalmus$ at the same food intake. However, the higher growth observed in #P. bocourti$ is obviously associated to higher fat accumulation in the body. The protein efficiency, NPU and PER, tends to be reduced at higher protein intake in both species. Energy and... |
| Tipo: Text |
Palavras-chave: POISSON D'EAU DOUCE; PISCICULTURE; ALIMENTATION ANIMALE; RATION ALIMENTAIRE; BESOIN NUTRITIONNEL; PROTEINE; ENERGIE; METABOLISME; CROISSANCE; ETUDE COMPARATIVE. |
| Ano: 1998 |
URL: http://www.documentation.ird.fr/hor/fdi:010020354 |
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| Luquet, Pierre; Moreau, Yann; Médale, F.; Kaushik, S.J.. |
| Atipa (#Hoplosternum littorale$), a tropical fish from South Africa, was starved for 50 days. Changes in whole body composition (dry matter, proteins, amino acids, minerals, fats, and energy) were studied in order to assess the utilization of such nutrients for routine metabolism. The intensity of catabolism decreased with the duration of the fast. During the first ten days the daily losses amounted to 0.55 g. 0.29 g. and 0.14 g. respectively for fresh body weight, dry water, and proteins per 100 g initial body weight. During the following forty days, daily losses were on average half of the previous values. There was remarkable conservation of certain nutrients including mineral and lipid reserves and amino acids. There were two very distinct phases in... |
| Tipo: Text |
Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; BESOIN NUTRITIONNEL; METABOLISME; BILAN ENERGETIQUE; ATIPA. |
| Ano: 1991 |
URL: http://www.documentation.ird.fr/hor/fdi:40645 |
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| Registros recuperados: 19 | |
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