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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$. Interrelationship of commonly used indices for growth and nutrition is discussed. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ELEVAGE; BESOIN NUTRITIONNEL; PROTEINE; BILAN ENERGETIQUE; EXPERIMENTATION; ANALYSE QUALITATIVE; TILAPIA.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40803
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Alimentation de l'atipa (Hoplosternum littorale) : étude du cycle nycthemeral de l'autodistribution de la nourriture IRD
Moreau, Yann; Luquet, Pierre; Boujard, T..
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; ALIMENTATION ANIMALE; EXPERIMENTATION; INTENSITE LUMINEUSE; RYTHME NYCTHEMERAL; BESOIN NUTRITIONNEL; ATIPA; RELATION ESPECE ENVIRONNEMENT.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:40647
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Consommation volontaire d'aliments en situation d'alternance de lumière et d'obscurité chez Heterobranchus longifilis IRD
Avit, J.B.; Luquet, Pierre.
Tipo: Text Palavras-chave: NUTRITION ANIMALE; EXPERIMENTATION; CROISSANCE; RYTHME BIOLOGIQUE; LUMIERE; SILURE; POISSON CHAT; OBSCURITE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:43018
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Diel cycles in Hoplosternum littorale (Teleostei) : entrainment of feeding activity by low intensity colored light IRD
Boujard, T.; Moreau, Yann; Luquet, Pierre.
Low intensity colored light is very often used to observe or manipulate fish during the scotophase. According to data on fish vision, most species can perceive these wavelengths of light since their cone pigments have maximum absorption peaks around 455, 530 and 625 nm. To test whether #Hoplosternum littorale$ 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$. A closed respirometer was designed to measure the gas exchanges of this air-breathing fish in both aerial and aquatic media. The accuracy and the validity of the method were tested. The energy expenditure of fish fasted for 10 days and the involvement of energy-yielding body stores were calculated from the measurements of O2 uptake, CO2 output, and the nitrogen excretion of fasted Atipas. The average energy expenditure was 1.58kJ/kg/hr and endogenous lipids were the main energy purveyor. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; RESPIRATION; BESOIN NUTRITIONNEL; METABOLISME; ATIPA; ANALYSE CALORIMETRIQUE.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:40648
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Mise en évidence et valorisation de la croissance compensatrice chez Heterobranchus longifilis IRD
Luquet, Pierre; Otémé, Z.J.; Cissé, A..
Trois niveaux trophiques ont été expérimentalement étudiés chez le silure africain #Heterobranchus longifilis$. Au cours d'un premier essai, des poissons d'un poids initial de 60g ont été rationnés (1% du poids vif) pendant trois semaines puis alimentés pendant trois semaines soit ad libitum soit à 3% du poids vif. Leur croissance a été comparée à celle de poissons nourris en permanence soit en excès soit à raison de 3% du poids vif. Si le poids vif final des lots ayant subi une restriction est inférieur à celui de leurs homologues alimentés à taux constant, les résultats indiquent que la restriction alimentaire induit ultérieurement une croissance spécifique significativement supérieure, et un indice de consommation meilleur. Cette croissance...
Tipo: Text Palavras-chave: NUTRITION ANIMALE; EXPERIMENTATION; CROISSANCE; NIVEAU TROPHIQUE; SILURE; POISSON CHAT.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:43019
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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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Recherche d'une alimentation artificielle adaptée à l'élevage des stades larvaires des poissons. I. Comparaison de quelques techniques destinées à améliorer la stabilité à l'eau des aliments ArchiMer
Gatesoupe, François-joël; Luquet, Pierre.
The aim of the present work is to compare different methods employed for increasing the stability to water of diets used for feeding fish larvae. The various methods of protection tested are : - the addition of gelatin to the diet, - the encapsulation by synthetic (nylon) or natural (gelatin, zein) polymers, - the coating by zein. The water stability of the unprotected diet particles is very low : only 3 % of the diets are recovered by filtration after 4 hours in water. The addition of 10 % gelatin impro­ves slightly this stability (13 to 25). While encapsulation with nylon considerably increases the water-standing capacity of diets (56 to 66 %), the best results are obtained with the particles encapsulated using natural polymers (74 to 79 %). Though...
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Ano: 1977 URL: http://archimer.ifremer.fr/doc/00305/41627/40836.pdf
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Recherche d'une alimentation artificielle adaptée à l'élevage des stades larvaires des poissons. II. Application à l'élevage larvaire du bar et de la sole ArchiMer
Gatesoupe, François-joël; Girin, Michel; Luquet, Pierre.
Various zein-coated artificial diets were distributed either alone or in associa­tion with rotifers to larvae of sea-bass and sole. Utilization of artificial diets alone gave rather unsatisfactory results, whereas , the simultaneous use of these with limited quantity of live-preys proved successful : when a low density of fish was retained (3 to S larvae/litre), it was found that the survival rate after one month for the sea-bass was above 10 p. 100 and for the sole, there was metamorpho­sis up to 71 p. 100. The analysis of results obtained for the different artificial diets seems to indicate that the superiority of live rotifers is more due to their movement than to their composition.
Tipo: Text
Ano: 1977 URL: http://archimer.ifremer.fr/doc/00305/41622/40831.pdf
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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 par Chrysichthys nigrodigitatus (Bagridae) d'ensilage chimique ou biologique de poisson IRD
Cissé, A.; Luquet, Pierre; Etchian, A..
Deux expériences ont été réalisées pour tester la valeur alimentaire, pour le machoiron (#Chrysichthys nigrodigitatus$), de dérivés de poissons de mer conservés par la méthode de l'ensilage. Le premier essai a concerné des déchets de conserveries de thons conservés par la méthode de l'ensilage acide (3% d'acide formique). L'hydrolysat, renfermant 66,7% de protéines brutes (N x 6,25) sur la base de la matière sèche (MS) a été incorporé dans un aliment expérimental en substitution à la farine de poisson sur une base iso-azotée. Les aliments ont été distribués à 6 lots de 50 machoirons, d'un poids initial de 34g, pendant 56 jours à raison de 3% (sec) du poids vif... Les produits de la pêche ou leurs dérivés conservés par la méthode de l'ensilage acide ou du...
Tipo: Text Palavras-chave: AQUACULTURE; ALIMENTATION ANIMALE; TEST; CROISSANCE; SILURE; MACHOIRON.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:43017
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Utilization of the principal nutrients for routine metabolism in atipa (Hoplosternum littorale) on starvation IRD
Luquet, Pierre; Moreau, Yann; Médale, F.; Kaushik, S.J..
Atipa (#Hoplosternum littorale$), 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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