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The influence of the dietary macronutrient balance on the intermediary metabolism of common dentex (Dentex dentex L.) was evaluated. Four experimental diets combining high and low levels of macronutrients were formulated. Dentex fed on 43% protein had higher liver and muscle lipid content, corresponding with an increased hepatic G6PDH activity. This(More)
The aim of this work was to evaluate the effects of prolonged starvation and refeeding on antioxidant status and some metabolic-related parameters in common dentex (Dentex dentex) liver. Fish deprived of food for 5 weeks showed a significant increase in lipid peroxidation, measured as malondialdehyde (MDA) levels. The activity of the antioxidative enzymes(More)
A wide range of antioxidant mechanisms are present in fish maintaining an adequate "oxidative balance". When this balance tilts in favor of the oxidant agents "oxidative stress" arises with detrimental effects in molecules of great biological importance. Little has been reported about the influence of different dietary energy sources on antioxidant defenses(More)
The particular metabolic strategies of the common dentex (Dentex dentex) to face a period of prolonged starvation and subsequent refeeding were assessed. Plasma metabolites, endogenous reserves, and the activity of key enzymes of intermediary metabolism in liver, white muscle, and heart were evaluated. Plasma glucose, total lipid, triglycerides, total-,(More)
Two feeding trials were carried out to evaluate the efficiency of probiotics and maslinic acid, on growth and survival of juvenile dentex; liver proteolytic activities were also investigated in the second trial. For experiment 1, triplicate groups were fed six diets with two probiotics (Bacillus toyoi, T, and B. cereus, E) at increasing levels (0.5, 1 and 2(More)
Digestive physiology of on-growing common dentex (Dentex dentex), including protease, amylase and lipase activity in stomach, pyloric caeca, anterior and posterior intestine, was evaluated. The influence of dietary macronutrient balance on these digestive processes was also assessed. Four experimental diets with different protein:lipid:carbohydrate ratios(More)
The effect of protein quality and of supplementation of corn-glutenprotein with lysine on the growth, feed conversion and protein turnoverrates in white muscle was investigated in carp (Cyprinus carpio) acclimatedto either 18 or 25 °C. Fish fed the lysine-deficient diet showed asignificantly lower food intake, weight gain and feed-conversion efficiencythan(More)
1. There was a general increase in the activities of enzymes involved in gluconeogenesis in liver and kidney of rainbow trout, Salmo gairdneri, during the second month of starvation. 2. The need of gluconeogenesis during the first month of the starvation period was probably minimal because of the utilization of liver glycogen as a source of blood glucose.(More)
The e¡ects of handling on haematocrit, haemoglo-bin, plasma glucose, lactate and total amino acids, liver glycogen and hepatic activity of fructose 1,6-bisphosphatase (FBPase) and alanine aminotrans-ferase (AAT) were investigated in common dentex (Dentex dentex Linnaeus,1758). A total of 42 ¢sh (50-g weight) were subjected to handling (netting and shaking(More)
We determined the annual change in the intermediary metabolism of glucose through the variations of specific activity of fructose 1,6-bisphosphatase (FBPase), alanine aminotransferase (AAT) and pyruvate kinase (PK). Fish (average mass 330 g) were kept in cages under natural conditions of temperature and photoperiod and fed with a commercial diet. FBPase,(More)