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Absolute feeding design, a realistic way for fish nutrients requirements determination IRD
Moreau, Yann; Cissé, A.; Luquet, Pierre.
Feeding experiment is designed on the basis of food allowance rather than feed formulation. Food allowances are fixed in the attempt to provide the desired amount of nutricients per body mass of fish per day (in terms of g.kg-1.d-1 or J.kg-1.d-1). By this way, previous determination of optimum feeding ration is not required, and utilization of neutral feed complement (e.g. cellulose) is unnecessary. Experiment interpretation of this design is presented for a tipalia species, #Sarotherodon melanotheron$. Interrelationship of commonly used indices for growth and nutrition is discussed. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ELEVAGE; BESOIN NUTRITIONNEL; PROTEINE; BILAN ENERGETIQUE; EXPERIMENTATION; ANALYSE QUALITATIVE; TILAPIA.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40803
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Alimentation de l'atipa (Hoplosternum littorale) : étude du cycle nycthemeral de l'autodistribution de la nourriture IRD
Moreau, Yann; Luquet, Pierre; Boujard, T..
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; ALIMENTATION ANIMALE; EXPERIMENTATION; INTENSITE LUMINEUSE; RYTHME NYCTHEMERAL; BESOIN NUTRITIONNEL; ATIPA; RELATION ESPECE ENVIRONNEMENT.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:40647
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Couverture des besoins énergétiques des poissons tropicaux en aquaculture : purification et comparaison des amylases de deux tilapias Oreochromisniloticus et Sarotherodon melanotheron IRD
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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Détermination des coefficients de digestibilité apparents pour Oreochromis niloticus de sous-produits agro-industriels disponibles en côte d'Ivoire IRD
Moreau, Yann.
Tipo: Text Palavras-chave: AQUACULTURE; PISCICULTURE; POISSON; ALIMENT POUR ANIMAUX; DIGESTIBILITE; ETUDE EXPERIMENTALE.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010039320
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Diel cycles in Hoplosternum littorale (Teleostei) : entrainment of feeding activity by low intensity colored light IRD
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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Energy : protein management by some warmwater finfishes IRD
Luquet, Pierre; Moreau, Yann.
If warmwater finfish protein requirements as level in diet is low, absolute intake per day is similar to those of coldwater species. But relation to this requirement with specific growth rate differs for strictly warmwater fishes as tilapia. Analysis of partition between protein and non-protein energy provided and consequently improve their protein retention. Better carbohydrate digestibility and metabolism are propunded as part of the exploration. (Résumé d'auteur)
Tipo: Text Palavras-chave: AQUACULTURE; POISSON; BESOIN NUTRITIONNEL; PROTEINE; BILAN ENERGETIQUE; TILAPIA.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:41260
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Energy resources in atipa, Hoplosternum littorale, a neotropical air breathing catfish IRD
Moreau, Yann; Médale, F.; Boujard, T.; Luquet, Pierre.
Metabolic utilization of energy substrates by a tropical catfish species, #Hoplosternum littorale$, was investigated. Both endogenous and exogenous substrates were considered, either through analysis of whole body losses during long term starvation, or through indirect calorimetric measurements. Results show that utilization of fats, during long term starvation, was not related to their body concentration. Even if most of the energy is provided by proteins, as for temperate species, carbohydrates could be used as far as they remain available. Therefore, carbohydrates metabolism seems to be active in "Atipa". (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; METABOLISME; BILAN ENERGETIQUE; NUTRITION ANIMALE; METHODOLOGIE; ANALYSE QUANTITATIVE; ANALYSE CALORIMETRIQUE; ATIPA.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40789
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Entrainment of the circadian rythm of food demand by infradian cycles of light-dark alternation in Hoplosternum littorale (Teleostei) IRD
Boujard, T.; Moreau, Yann; Luquet, Pierre.
#Hoplosternum littorale$ (Hancock, 1828) shows a marked circadium rhythm of food demand. Feeding activity is mainly nocturnal, with two peaks, and is synchronized whith the diel light cycle. We tested the effect of infradian (period > 28h) light dark cycles on this rhythm in fish with demand-feeders : fish subjected to a 13.5 L/22.5 D light dark cycle for 8 days and a 25.5 L/10.5 D cycle for a further 8 days showed a strictly nocturnal feeding activity a response that only passively reflected the cycle alternation of light and dark. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ETHOLOGIE; ALIMENTATION ANIMALE; RYTHME NYCTHEMERAL; SILURIFORME; RYTHME CIRCADIEN.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:40932
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Etude du transit digestif chez un poisson-chat, l'Atipa (Hoplosternum littorale) : influence de repas successifs IRD
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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Indirect calorimetry method to study energy metabolism of an air-breathing fish, Hoplosternum littorale (Siluriform, Callichtyidae) IRD
Moreau, Yann; Médale, F.; Boujard, T.; Luquet, Pierre.
The aim of the present work was to implement indirect calorimetry method to study energy metabolism of an air-breathing neotropical fish, #Hoplosternum littorale$. A closed respirometer was designed to measure the gas exchanges of this air-breathing fish in both aerial and aquatic media. The accuracy and the validity of the method were tested. The energy expenditure of fish fasted for 10 days and the involvement of energy-yielding body stores were calculated from the measurements of O2 uptake, CO2 output, and the nitrogen excretion of fasted Atipas. The average energy expenditure was 1.58kJ/kg/hr and endogenous lipids were the main energy purveyor. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; RESPIRATION; BESOIN NUTRITIONNEL; METABOLISME; ATIPA; ANALYSE CALORIMETRIQUE.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:40648
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L'aquaculture lagunaire IRD
Hem, Saurin; Legendre, Marc; Trébaol, L.; Cissé, A.; Otémé, Z.; Moreau, Yann.
Tipo: Text Palavras-chave: LAGUNE; AQUACULTURE; POISSON; REPRODUCTION; PONTE; MILIEU NATUREL; EXPERIMENTATION; METHODE D'ELEVAGE; TILAPIA; SILURE; MACHOIRON; ACADJA ENCLOS.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:40700
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Physiologie de la nutrition = Physiology of nutrition IRD
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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Physiologie de la respiration = Physiology of respiration IRD
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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Postprandial utilization of energy susbtrates by a tropical catfish, Holosternum littorale : indirect calorimetry analysis IRD
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$, Siluriform). A model was adjusted to the data on respiratory exchanges and nitrogen excretion for this purpose. As for other fish species, protein was actively catabolized after feeding during the 60 hr measurement time. As long as carbohydrates were available, atipa was also able to use these substrates for its energy metabolism. A gradual increase of contribution of lipids was then noticed. Over a 24 hr period following the food intake, a 30 g fish catabolized 90 mg of proteins and 43 mg of carbohydrates. At the same time, the results led to a synthesis of 3.7 mg of fat. An estimation of the increase of the...
Tipo: Text Palavras-chave: POISSON; ETHOLOGIE; NUTRITION ANIMALE; METABOLISME; RESPIRATION; EXCRETION; BILAN ENERGETIQUE; ANALYSE QUALITATIVE; ANALYSE QUANTITATIVE; MODELE; ANALYSE CALORIMETRIQUE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:40470
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Protein and energy utilisatoin in two Mekong catfishes, Pangasius bocourti and Pangasius hypophthalmus IRD
Le Thanh Hung; Lazard, J.; Tu, H.T.; Moreau, Yann.
Fish unlike terrestrial animals, use a large amount of protein as an energy source for their energy metabolism. When fed on a high protein raiton, the fish itself may choose which amount of protein in food will be converted into body growth and which will be burned through the catabolism. Therefore, in the study one diet was designed with a high protein content and fed to fish with different levels : 0, 5, 15, 25, 35 and 45 g crude protein kg/d. #P. bocourti$ 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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Recherches sur l'aquaculture du machoiron IRD
Hem, Saurin; Bard, François-Xavier; Otémé Z.; Moreau, Yann.
Tipo: Text Palavras-chave: LAGUNE; AQUACULTURE; METHODE D'ELEVAGE; EXPERIMENTATION; REPRODUCTION; PONTE; ANALYSE QUANTITATIVE; POISSON CHAT; ALIMENTATION ARTIFICIELLE.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:41090
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The culture of Hoplosternum littorale : state of the art and perspectives IRD
Luquet, Pierre; Boujard, T.; Planquette, P.; Moreau, Yann; Hostache, G..
#Hoplosternum littorale$ is a siluriform fish of very high commercial value in some country of South America. Some biological characteristics as easy spawning in confinement and good tolerance of low oxygen level make it easy to cultivate. Aquatic oxygen uptake does not allow to sustain standard metabolism, so it is considered as an obligated air breather. Routine metabolism and growth cannot be completed without air access. A circadian rythm for feeding behaviour is observed. Most voluntary food intake occur during the night. The sunset is a directive factor even in case of time lag. So, a night feeding schedule should bbe used in practise. (D'après résumé d'auteur)
Tipo: Text Palavras-chave: AQUACULTURE; REPRODUCTION; FECONDITE; RYTHME NYCTHEMERAL; SEX RATIO; POISSON CHAT.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:41259
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Utilisation digestive de l'amidon chez un tilapia, Sarotherodon melanotheron (Pisces, Cichlidae) : étude de l'activité amylasique : rapport de stage IRD
Moreau, Yann.
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; NUTRITION ANIMALE; AMIDON; ANALYSE STATISTIQUE; ACTIVITE AMYLASIQUE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40663
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Utilization of the principal nutrients for routine metabolism in atipa (Hoplosternum littorale) on starvation IRD
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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