Search results for: Efthimia Antonopoulou

Items from 1 to 20 out of 30 results

article

Dietary lysine requirement of greater amberjack juvenile (Seriola dumerili, Risso, 1810)

Yannis Kotzamanis, Femi J. Fawole, Andreas Brezas, Vikas Kumar, more

Aquaculture Nutrition > 27 > 6 > 2107 - 2118

An 8‐week feeding trial was conducted to determine the dietary lysine requirement of greater amberjack, Seriola dumerili. Six experimental diets resulting from a practical basal formulation were produced to containing mainly plant ingredients (25% fish meal) were supplied with graded levels of crystalline L‐lysine‐HCl and the analysed lysine concentration in each diet was found to be 1.93 (basal diet;...

article

Effects of fish oil substitution by hazelnut oil on growth performance, whole‐body fatty acid composition and enzymes of intermediary metabolism of juvenile meagre (Argyrosomus regius Asso, 1801)

Lydia Katsika, Oguz Tasbozan, Maria Mastoraki, Stelios Karapanagiotis, more

Aquaculture Research > 52 > 11 > 5760 - 5776

The need for new alternative oil sources in the ever‐increasing aquaculture of carnivorous species is imperative. We substituted fish oil (FO) with hazelnut oil (HO) in meagre diet at 20, 40, 60, 80 and 100%. Triplicate groups of 40 fish/tank juvenile meagre (ca 15 g) were used. For the reduction of FO level in meagre diet, a 40% substitution by HO is attainable without affecting growth performance...

article

Genetic structure and divergence of tench Tinca tinca European populations

Nikoleta Karaiskou, Konstantinos Gkagkavouzis, Stella Minoudi, Dimitrios Botskaris, more

Journal of Fish Biology > 97 > 3 > 930 - 934

The tench Tinca tinca is a freshwater species with human‐mediated translocations, aquaculture interest and limited information on its genetic structure. mtDNA sequencing analysis of control region and two genes in 50 individuals from five European populations identified two phylogroups, with greater variability than that reported until now, and a hybridization zone in the Danube River region. Restriction...

article

The effect of insect meal as a feed ingredient on survival, growth, and metabolic and antioxidant response of juvenile prawn Palaemon adspersus (Rathke, 1837)

Maria Mastoraki, Nikolaos Vlahos, Efstathia Patsea, Stavros Chatzifotis, more

Aquaculture Research > 51 > 9 > 3551 - 3562

For successful prawn aquaculture, feeds should be based on readily consumed ingredients that promote survival and optimal growth performance. This pilot study investigates the rearing of juvenile Baltic prawn Palaemon adspersus. Two feeding trials were carried out for 60 days; both incorporated insect meals, the first one in fishmeal‐based diets, whereas the second one in plant meal ones. Insect meals...

article

Effects of partial dietary supplementation of fish meal with soymeal on the stress and apoptosis response in the digestive system of common dentex (Dentex dentex)

Efthimia Antonopoulou, Eleni Chouri, Konstantinos Feidantsis, Antigone Lazou, more

Journal of Biological Research-Thessaloniki > 2017 > 24 > 1 > 1-10

Background Soybean is a common alternative protein source of plant origin in aquafeeds as it has a reasonably balanced amino acid profile and is widely available. This study aimed to investigate the influence of partial substitution of fish meal with soy meal on cytoprotective pathways and apoptosis in the digestive system of common dentex (Dentex dentex), using the activation of Hsp70, p38 MAPK,...

article

Effects of long-term feed deprivation on body weight loss, muscle composition, plasma metabolites, and intermediate metabolism of meagre (Argyrosomus regius) under different water temperatures

Stavros Chatzifotis, Sofia Clavero, Christiana Kounna, Alexandros Soumalevris, more

Fish Physiology and Biochemistry > 2018 > 44 > 2 > 527-542

The effect of feed deprivation at four water temperatures (17, 20, 23, 26 °C) was investigated in meagre (Argyrosomus regius) of initial mean weight ± SD, 116.16 ± 4.74 g, in triplicate groups. Fish were deprived of feed for a period of 60 days and sampled on days 0, 14, 41, and 60, during which body weight, specific growth rate, somatic indices, muscle proximate composition, plasma metabolite levels...

article

Tenebrio molitor meal in diets for European sea bass (Dicentrarchus labrax L.) juveniles: Growth performance, whole body composition and in vivo apparent digestibility

Laura Gasco, Morgane Henry, Giovanni Piccolo, Stefania Marono, more

Animal Feed Science and Technology > 2016 > 220 > C > 34-45

Two trials were carried out on European sea bass (Dicentrarchus labrax L.) juveniles to evaluate the effects of dietary inclusion of a full-fat Tenebrio molitor (TM) larvae meal. A first growth trail was performed on 450 European sea bass using three isonitrogenous and isolipidic experimental diets (3 tanks/diet, 50 fish/tank) formulated to contain increasing levels of TM meal inclusion and precisely:...

article

Synergistic effects of acute warming and low pH on cellular stress responses of the gilthead seabream Sparus aurata

Konstantinos Feidantsis, Hans-O. Pörtner, Efthimia Antonopoulou, Basile Michaelidis

Journal of Comparative Physiology B > 2015 > 185 > 2 > 185-205

The present study assesses the resilience of the Mediterranean gilthead seabream (Sparus aurata) to acute warming and water acidification, using cellular indicators of systemic to molecular responses to various temperatures and CO₂ concentrations. Tissue metabolic capacity derived from enzyme measurements, citrate synthase, 3-hydroxyacyl CoA dehydrogenase (HOAD), as well as lactate dehydrogenase....

article

Identification, Phylogeny, and Function of fabp2 Paralogs in Two Non-Model Teleost Fish Species

Elisavet Kaitetzidou, Stavros Chatzifotis, Efthimia Antonopoulou, Elena Sarropoulou

Marine Biotechnology > 2015 > 17 > 5 > 663-677

Intestinal fatty-acid-binding protein (IFABP or FABP2) is a cytosolic transporter of long-chain fatty acids, which is mainly expressed in cells of intestinal tissue. Fatty acids in teleosts are an important source of energy for growth, reproduction, and swimming and a main ingredient in the yolk sac of embryos and larvae. The fabp2 paralogs, fabp2a and fabp2b, were identified for 26 teleost fish species...

article

Dietary lipid levels in meagre (Argyrosomus regius): Effects on biochemical and molecular indicators of liver

Efthimia Antonopoulou, Evgenia Kousidou, Evangelia Tserga, Konstantinos Feidantsis, more

Aquaculture > 2014 > 428-429 > C > 265-271

The present study provides characterization of cellular and metabolic responses and examines the antioxidant defence in the liver of meagre (Argyrosomus regius) in relation to dietary lipid consumed (13%, 17% and 21%). Molecular responses were addressed through the levels of Hsp70 and Hsp90 and the phosphorylation of mitogen activated protein kinases (p38-MAPK, the extracellular signal-regulated kinases...

article

The force of the spontaneously contracting zebrafish heart, in the assessment of cardiovascular toxicity: Application on adriamycin

Triantafyllia Orfanidou, Chrisovalantis Papaefthimiou, Efthimia Antonopoulou, Ioannis Leonardos, more

Toxicology in Vitro > 2013 > 27 > 5 > 1440-1444

The heart of the zebrafish has been used extensively to assess the cardiotoxic effect of compounds, using the frequency of heart contractions as the main index of cardiac response to drugs. In this study, the force and the frequency generated by the spontaneously contracting zebrafish heart, isolated in saline, were found to be 0.87±0.05mN and 1.54±0.03Hz (n=6) respectively within the first hour of...

article

Starvation and re-feeding affect Hsp expression, MAPK activation and antioxidant enzymes activity of European Sea Bass (Dicentrarchus labrax)

Efthimia Antonopoulou, Elissavet Kentepozidou, Konstantinos Feidantsis, Chrysoula Roufidou, more

Comparative Biochemistry and Physiology, Part A > 2013 > 165 > 1 > 79-88

In the context of food deprivation in fish (wild and farmed), understanding of cellular responses is necessary in order to develop strategies to minimize stress caused by starvation in the aquaculture section. The present study evaluates the effects of long term starvation (1F–3S: one-month feeding–three-month starvation) and starvation/re-feeding (2S–2F: two-month starvation–two-month re-feeding)...

article

Seasonal variations of cellular stress response of the gilthead sea bream (Sparus aurata)

Konstantinos Feidantsis, Efthimia Antonopoulou, Antigone Lazou, Hans O. Pörtner, more

Journal of Comparative Physiology B > 2013 > 183 > 5 > 625-639

The present study aimed to investigate the seasonal cellular stress response in vital organs, like the heart, the liver, the whole blood and the skeletal (red and white) muscles of the Mediterranean fish Sparus aurata during a 1-year acclimatization period in the field, in two examined depths (0–2 m and 10–12 m). Processes studied included heat shock protein expression and protein kinase activation...

article

Expression of Developmental-Stage-Specific Genes in the Gilthead Sea Bream Sparus aurata L.

Carmen García Fernández, Chrysoula Roufidou, Efthimia Antonopoulou, Elena Sarropoulou

Marine Biotechnology > 2013 > 15 > 3 > 313-320

The mechanism of early fish development as well as the control of egg quality is of great importance for the ability of the oocyte to develop after fertilization. Embryonic development is initially regulated by maternally provided mRNAs and later by the zygotic genome. Maternal mRNAs have an important role in initiating processes crucial to patterning the developing fish embryo. Furthermore, it has...

article

Transcriptomic Response of Skeletal Muscle to Lipopolysaccharide in the Gilthead Seabream (Sparus aurata)

Elisavet Kaitetzidou, Diego Crespo, Yoryia Vraskou, Efthimia Antonopoulou, more

Marine Biotechnology > 2012 > 14 > 5 > 605-619

The physiological consequences of the activation of the immune system in fish are not well understood. In particular, skeletal muscle, due to its essential role in locomotion and whole-animal energy homeostasis, is a potentially important target of inflammation. In this study, we have evaluated the in vivo effects of lipopolysaccharide (LPS) on the white and red skeletal muscle transcriptome of the...

article

Effect of starvation and re-feeding on reproductive indices, body weight, plasma metabolites and oxidative enzymes of sea bass (Dicentrarchus labrax)

Stavros Chatzifotis, Maria Papadaki, Smaragda Despoti, Chrysoula Roufidou, more

Aquaculture > 2011 > 316 > 1-4 > 53-59

Feed management is an important factor for successful aquaculture, especially when it affects gonad maturation. In this context, the present study evaluates the effects of long term starvation (1F–3S: one-month feeding – three-month starvation) and starvation/re-feeding (2S–2F: two-month starvation – two-month re-feeding) on gonad maturation, hematological/biochemical indices and proximate composition...

article

Teleost maturation-inducing hormone, 17,20β-dihydroxypregn-4-en-3-one, peaks after spawning in Tinca tinca

Efthimia Antonopoulou, Athanassios C. Tsikliras, Martin Kocour, Vladimir Žlábek, more

General and Comparative Endocrinology > 2011 > 172 > 2 > 234-242

During an eight month study of the reproductive cycle in two age groups, and in both sexes, of tench (Tinca tinca L.), it was found that plasma concentrations of the presumptive ‘maturation inducing hormone (MIH)’ 17,20β-dihydroxypregn-4-en-3-one (17,20β-P) did not reach a peak during the spawning season, but as much as two months after spawning had ceased. The cessation of the spawning season was...

article

Spawning period of Mediterranean marine fishes

Athanassios C. Tsikliras, Efthimia Antonopoulou, Konstantinos I. Stergiou

Reviews in Fish Biology and Fisheries > 2010 > 20 > 4 > 499-538

We collected all available information (i.e. international and local journals, conference proceedings, theses, technical reports) on the spawning season (n = 511 stocks, 168 species), gonadosomatic index (n = 237 stocks, 81 species) and sex ratio (n = 97 stocks, 68 species) of Mediterranean marine fish. The 511 stocks represented 20 orders (most were Perciformes, 283 stocks) and 65 families (most...

article

Comparing the inhibitory effects of five protoxicant organophosphates (azinphos-methyl, parathion-methyl, chlorpyriphos-methyl, methamidophos and diazinon) on the spontaneously beating auricle of Sparus aurata: An in vitro study

Melpomeni Tryfonos, Chrisovalantis Papaefthimiou, Efthimia Antonopoulou, George Theophilidis

Aquatic Toxicology > 2009 > 94 > 3 > 211-218

Organophosphates (OPs) can provoke toxicity by inhibiting acetylcholinesterase (AChE) in non-target organisms, like fish. In a previous pilot study, the anticholinesterase effects of paraoxon on the heart of Sparus aurata were examined [Tryfonos, M., Antonopoulou, E., Papaefthimiou, C., Chaleplis, G., Theophilidis, G., 2009. An in vitro assay for the assessment of the effects of an organophosphate,...

article

Effects of aromatase inhibitors and different doses of testosterone on gonadotropins in one year old male Atlantic salmon (Salmo salar)

Efthimia Antonopoulou, Penny Swanson, Bertil Borg

Comparative Biochemistry and Physiology, Part A > 2009 > 153 > 4 > 408-416

The effects of different doses of testosterone (T), the aromatase inhibitors 1,4,6-androstatriene-3,17-dione (ATD) and 4-hydroxy-4-androstene-3,17-dione (4OH), and the combined treatment of T and ATD on luteinizing hormone (LH) and follicle-stimulating hormone (FSH) at the onset of puberty in juvenile Atlantic salmon males were investigated. T always increased pituitary LH. Also, ATD increased pituitary...

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INFONA - science communication portal

Search results for: Efthimia Antonopoulou

Dietary lysine requirement of greater amberjack juvenile (Seriola dumerili, Risso, 1810)

Effects of fish oil substitution by hazelnut oil on growth performance, whole‐body fatty acid composition and enzymes of intermediary metabolism of juvenile meagre (Argyrosomus regius Asso, 1801)

Genetic structure and divergence of tench Tinca tinca European populations

The effect of insect meal as a feed ingredient on survival, growth, and metabolic and antioxidant response of juvenile prawn Palaemon adspersus (Rathke, 1837)

Effects of partial dietary supplementation of fish meal with soymeal on the stress and apoptosis response in the digestive system of common dentex (Dentex dentex)

Effects of long-term feed deprivation on body weight loss, muscle composition, plasma metabolites, and intermediate metabolism of meagre (Argyrosomus regius) under different water temperatures

Tenebrio molitor meal in diets for European sea bass (Dicentrarchus labrax L.) juveniles: Growth performance, whole body composition and in vivo apparent digestibility

Synergistic effects of acute warming and low pH on cellular stress responses of the gilthead seabream Sparus aurata

Identification, Phylogeny, and Function of fabp2 Paralogs in Two Non-Model Teleost Fish Species

Dietary lipid levels in meagre (Argyrosomus regius): Effects on biochemical and molecular indicators of liver

The force of the spontaneously contracting zebrafish heart, in the assessment of cardiovascular toxicity: Application on adriamycin

Starvation and re-feeding affect Hsp expression, MAPK activation and antioxidant enzymes activity of European Sea Bass (Dicentrarchus labrax)

Seasonal variations of cellular stress response of the gilthead sea bream (Sparus aurata)

Expression of Developmental-Stage-Specific Genes in the Gilthead Sea Bream Sparus aurata L.

Transcriptomic Response of Skeletal Muscle to Lipopolysaccharide in the Gilthead Seabream (Sparus aurata)

Effect of starvation and re-feeding on reproductive indices, body weight, plasma metabolites and oxidative enzymes of sea bass (Dicentrarchus labrax)

Teleost maturation-inducing hormone, 17,20β-dihydroxypregn-4-en-3-one, peaks after spawning in Tinca tinca

Spawning period of Mediterranean marine fishes

Comparing the inhibitory effects of five protoxicant organophosphates (azinphos-methyl, parathion-methyl, chlorpyriphos-methyl, methamidophos and diazinon) on the spontaneously beating auricle of Sparus aurata: An in vitro study

Effects of aromatase inhibitors and different doses of testosterone on gonadotropins in one year old male Atlantic salmon (Salmo salar)

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