Manioc : Portail | resultats 1 - 14 pour la recherche: Feeding chronology

Four years' residence in the West Indies
Auteur(s) : Bayley, Frederic William Naylor (1808-1853)
Auteurs secondaires : Haghe, Charles (1810-1888) Day, William (1797-1845)
Année de publication :

| Plus

Diel feeding periodicity, daily ration and relative food consumption in some fish populations in three reservoirs of Sri Lanka
Auteur(s) : Weliange, Wasantha S. Amarasinghe, Upali S. Moreau, Jacques Villanueva, Ching-maria

Éditeur(s) : EDP Sciences
Résumé : Twelve diel surveys were carried out in three reservoirs of Sri Lanka viz. Minneriya, Udawalawe and Victoria, to investigate diel feeding patterns, daily ration and relative food consumption in fish populations. Stomach content weights of different size classes of various fish species in the three reservoirs in 12 diel surveys were analysed using an iterative method, MAXIMS. Predominantly herbivorous or detritivorous fish species such as Amblypharyngodon melettinus and Oreochromis niloticus exhibited one peak in the diel feeding pattern. Two peak feeding periods were evident in predominantly insectivores and/or zooplanktivores (e. g., Puntius chola and Rasbora daniconius) and interestingly in macrophyte feeders (i.e., Etroplus suratensis, Puntius filamentosus and Tilapia rendalli). It might be possible that all species with two feeding peaks in diel feeding patterns rely on vision for feeding. Food consumption per biomass (Q/B ratio) defined as amount of food consumed per unit weight of an age-structured population of fish was estimated on the basis of the average quantities of food consumed over a long period of time by various size classes in order to minimize the bias of estimates.
Douze séries d'échantillonnage ont été effectuées dans trois lacs-réservoirs du Sri Lanka : Minneriya, Udawalawe et Victoria, afin d'étudier le modèle journalier d'alimentation, les rations journalières et à la consommation relative des populations de poissons. Les poids des contenus stomacaux de différentes classes de taille ont ainsi été analysés en utilisant une méthode itérative, MAXIMS. Les espèces herbivores ou détritivores telles que Amblypharyngodon melettinus et Oreochromis niloticus montrent un pic dans l'activité de nutrition. Tandis que les espèces détrivores et/ou zooplanctivores en présentent deux (ex., Puntius chola et Rasbora daniconius) de même que des espèces se nourrissant de macrophytes (ex., Etroplus suratensis, Puntius filamentosus et Tilapia rendalli). Il est possible que la vision joue un rôle chez ces espèces présentant deux pics journaliers d'alimentation. La consommation de nourriture par rapport à la biomasse (le rapport Q/B) est défini comme la quantité d'aliment consommé par unité de poids d'une population de poissons structurée en âge, sur la base de quantités moyennes de nourriture consommée sur une longue période de temps et par diverses classes de taille, afin de minimiser les biais dans les estimations.
Aquatic Living Resources (0990-7440) (EDP Sciences), 2006-07 , Vol. 19 , N. 3 , P. 229-237

Droits : 2006 EDP
http://archimer.ifremer.fr/doc/2006/publication-2134.pdf
DOI:10.1051/alr:2006023
http://archimer.ifremer.fr/doc/00000/2134/

| Plus

The colony of British Guyana and its labouring population
Auteur(s) : Bronkhurst, Rév. H.V.P.
Année de publication :

| Plus

The knockabout club in the Antilles and thereabouts
Auteur(s) : Ober, Frederick Albion (1849-1913)
Année de publication :

| Plus

Antigua and the Antiguans: a full account of the colony and its inhabitants from the time of the Caribs to the present day, interspersed with anecdotes and legends : also, an impartial view of slavery and the free labour systems, the statistics of the island, and biographical notices of the principal families, Volume 1
Année de publication :

| Plus

Personal narrative of travels to the equinoctial regions of America, during the years 1799-1804 / by Alexander von Humboldt and Aimé Bonpland ; translated from the French of Alexander von Humboldt and edited by Thomasina Ross. Volume 2
Auteur(s) : Bonpland, Aimé (1773-1858) Humboldt, Alexander von (1769-1859)
Année de publication :

| Plus

The English in the West Indies or the bow of Ulysses
Auteur(s) : Froude, James Anthony (1818-1894) Pearson, G.
Année de publication :

| Plus

Santo Domingo : past and present with a glance at Hayti
Auteur(s) : Hazard, Samuel (1834-1876)
Année de publication :

| Plus

Substitution of live food by formulated diets in marine fish larvae
Auteur(s) : Cahu, Chantal Zambonino, Jose-luis

Éditeur(s) : Elsevier
Résumé : Until recently, it was considered impossible to feed newly hatched marine fish species with a compound diet. Substituting a compound diet for live prey was performed several weeks after hatching, depending on the species. Compound diets were well ingested at the early stage but larvae died with a gut full of food, suggesting that larvae were unable to digest the compound diet. The hypothesis was that younger larvae have insufficient digestive enzymes to thrive on compound diets, and that exogenous enzymes, provided from live prey, are necessary for early stages.The organogenesis of marine fish larvae is not completely achieved at hatching and histological studies have revealed that the anatomy of the digestive tract undergoes developmental changes over some weeks. Nevertheless, biochemical studies over 20 years have shown that most of the digestive enzymes are present in young larvae. Recent studies have provided better understanding of digestion mechanisms in larvae and have led to proposed dietary compositions meeting larvae nutritional requirements. Pancreatic digestive enzymes are detected before mouth opening. Their synthesis is not induced by diet ingestion, but secretory mechanisms in the pancreas, and so enzymatic action, become efficient chronologically after those of synthesis. Inadequate diets can delay the onset of secretion mechanisms. The ratio of secreted enzymes to total enzymes indicates the nutritional value of the diet ingested by the larvae.At the intestinal level, cytosolic enzymes, which are peptidases, exhibit high activity in the early stages, suggesting a high capacity in larvae to digest protein hydrolysate. Indeed, larvae growth and survival is improved by the incorporation of a moderate concentration of peptide or hydrolysate in the diet. Peptidase activity abruptly decreases around day 25 in sea bass, concurrent with an increase in enzymes of the brush border membranes. This corresponds to a normal maturation process of enterocytes. Compound diets can slightly delay the onset of this maturation process, and inadequate diet can prevent it, leading to near death of the larvae. A proper onset of the maturation process has been associated with high larvae survival.The early developmental stage larvae exhibit high hydrolytic capacity, related to their weight. Enzyme activity pattern is age-dependent, but can be modulated by diet composition. Thus, larvae have the ability to digest and thrive on compound diet, if this diet is well adapted. Larvae have different specificities in digestion and nutritional requirements when compared to juveniles. Taking these specificities into consideration, recent research has led to the formulation of a compound diet that was well adapted for larvae from mouth opening, and could totally replace live prey.
Aquaculture (0044-8486) (Elsevier), 2001-08 , Vol. 200 , N. 1-2 , P. 161-180

Droits : 2001 Elsevier Science B.V. All rights reserved
http://archimer.ifremer.fr/doc/2001/publication-447.pdf
DOI:10.1016/S0044-8486(01)00699-8
http://archimer.ifremer.fr/doc/00000/447/

| Plus

Personal narrative of travels to the equinoctial regions of America, during the years 1799-1804 / by Alexander von Humboldt and Aimé Bonpland ; translated from the French of Alexander von Humboldt and edited by Thomasina Ross. Volume 1
Auteur(s) : Bonpland, Aimé (1773-1858) Humboldt, Alexander von (1769-1859)
Année de publication :

| Plus

Secret anecdotes of the revolution of the 18th fructidor ; september 4th, 1797 ; and new memoirs of the persons deported to Guiana, written by themselves : containing Letters from Général Murinais, Messrs. Barthélemy, Tronçon-du-Coudray, Laffond-Ladébat, De la Rue, &c. &c... ; A Narrative of events that took place at Guiana subsequent to the escape of Pichegru, Ramel, &c. ; A Picture of the prisons of Rochefort, by Richer-Serisy ; An Authentic account of the captivity and escape of Sir Sydney Smith ; A Memoire by Barbé-Marbois, &c. &c. ; Forming a sequel to the "Narrative of General Ramel"
Année de publication :

| Plus

The Life and voyages of Christopher Colombus ; together with the voyages of his companions (vol. 3)
Auteur(s) : Irving, Washington (1783-1859)
Année de publication :

| Plus

Baumwollproduktion und Pflanzungswirtschaft in den Nordamerikanischen Südstaaten. Erster Teil, Die Sklavenzeit : mit einer Karte und einer Tafel in Buntdruck
Auteur(s) : Halle, Ernst von (1868-1909)
Année de publication :

| Plus

Sketches of Hayti : from the expulsion of the French, to the death of Christophe
Auteur(s) : Harvey, William Woodis (1798-1864)
Année de publication :

| Plus