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| Registros recuperados: 31 | |
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| Boujard, T.; Rojas-Beltran, R.. |
| Le Sinnamary est un fleuve de Guyane Française, de moyenne importance (6565 km2). Il peut être divisé en trois zones : l'estuaire, le cours inférieur et le cours supérieur. Une série de pêches expérimentales a été réalisée dans le cours supérieur de ce fleuve, à l'aide de filets tramails de maille comprise entre 10 et 65 mm. La sélectivité des filets utilisés s'est avérée très forte, et la composition des captures fort différente selon la taille de la maille. Quatre espèces représentent 68% des prises #(Leporinus friderici, Curimata cyprinoides, Triporteus rotundadus, Myleus ternetzy)$ et l'analyse des captures montre que le nombre d'individus capturés par unité d'effort est supérieur en saison des pluies. L'origine de ces variations saisonnières de... |
| Tipo: Text |
Palavras-chave: POISSON D'EAU DOUCE; COURS D'EAU; STRUCTURE DE POPULATION; ECHANTILLONNAGE; PECHE EXPERIMENTALE; FILET TRAMAIL. |
| Ano: 1988 |
URL: http://www.documentation.ird.fr/hor/fdi:26646 |
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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$, was investigated. Both endogenous and exogenous substrates were considered, either through analysis of whole body losses during long term starvation, or through indirect calorimetric measurements. Results show that utilization of fats, during long term starvation, was not related to their body concentration. Even if most of the energy is provided by proteins, as for temperate species, carbohydrates could be used as far as they remain available. Therefore, carbohydrates metabolism seems to be active in "Atipa". (Résumé d'auteur) |
| Tipo: Text |
Palavras-chave: POISSON; ESPECE TROPICALE; ETHOLOGIE; METABOLISME; BILAN ENERGETIQUE; NUTRITION ANIMALE; METHODOLOGIE; ANALYSE QUANTITATIVE; ANALYSE CALORIMETRIQUE; ATIPA. |
| Ano: 1993 |
URL: http://www.documentation.ird.fr/hor/fdi:40789 |
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| Moreau, Yann; Medale, F.; Boujard, T.; Luquet, Pierre. |
| Indirect calorimetry method was used to measure postprandial utilization of energy substrates by atipa, #Hoplosternum littorale$ (#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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| Registros recuperados: 31 | |
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