David Mazurais

David Mazurais
Institut Français de Recherche pour l'Exploitation de la Mer | Ifremer · PFOM

About

125
Publications
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3,725
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Publications

Publications (125)
Article
Full-text available
This study presents a novel non-lethal sampling method for assessing fatty acid (FA) composition in juvenile European sea bass (Dicentrarchus labrax) using subcutaneous white muscle biopsies. This research aimed to evaluate the suitability of the biopsy for FA analysis using two lipid extraction protocols and comparing them to a lethal routine meth...
Article
Full-text available
Predator-prey interactions and, especially, the success of anti-predator responses are modulated by the sensory channels of vision, olfaction, audition and mechanosensation. If climate change alters fish sensory ability to avoid predation, community dynamics can be affected. We investigated whether mid-duration exposure to warming and/or acidificat...
Article
Full-text available
Global change puts coastal systems under pressure, affecting the ecology and physiology of marine organisms. In particular, fish larvae are sensitive to environmental conditions, and their fitness is an important determinant of fish stock recruitment and fluctuations. To assess the combined effects of warming, acidification and change in food quali...
Article
Full-text available
Physiological effects of ocean acidification associated with elevated CO2 concentrations in seawater is the subject of numerous studies in teleost fish. While the short time within-generation impact of ocean acidification (OA) on acid-base exchange and energy metabolism is relatively well described, the effects associated with transgenerational exp...
Article
Full-text available
Incorporation of dietary peptides has been correlated with decreased presence of skeletal abnormalities in marine larvae. In an attempt to clarify the effect of smaller protein fractions on fish larval and post-larval skeleton, we designed three isoenergetic diets with partial substitution of their protein content with 0% (C), 6% (P6) and 12% (P12)...
Article
Fish skeletal development has long been correlated with nutritional factors. Lack of zebrafish nutritional standardization, especially during the early stages, decreases the reproducibility of the conducted research. The present study represents an evaluation of four commercial (A, D, zebrafish specific; B, generic for freshwater larvae; C, specifi...
Article
Full-text available
Haemal lordosis, a frequent skeletal deformity in teleost fish, has long been correlated with increased mechanical loads induced by swimming activity. In the present study, we examine whether juvenile zebrafish can recover from haemal lordosis and explore the musculoskeletal mechanisms involved. Juveniles were subjected to a swimming challenge test...
Article
The absorption of anthropogenic carbon dioxide from the atmosphere by oceans generates rapid changes in seawater carbonate system and pH, a process termed ocean acidification. Exposure to acidified water can impact the allostatic load of marine organism as the acclimation to suboptimal environments requires physiological adaptive responses that are...
Presentation
Full-text available
In several organisms including fish, lipids are the most efficient source of energy compared to other nutrients. Some fatty acids (e.g. oleic acid, palmitic acid) are known to be preferentially used by organisms to create or to store energy. Here, we aimed to understand the relationship between FA profile, individual growth performance and well-bei...
Presentation
Full-text available
Sampling tissue on fish is usually carried out with the lethal collection of organic material (i.e. liver, brain, muscle…). Analysis of the fatty acid (FA) composition of fish tissue can provide information about nutritional quality, trophic behavior and is widespread in aquaculture research. Here we provide insight on an innovative non-lethal samp...
Article
Full-text available
Background Progressive CO2-induced ocean acidification (OA) impacts marine life in ways that are difficult to predict but are likely to become exacerbated over generations. Although marine fishes can balance acid–base homeostasis efficiently, indirect ionic regulation that alter neurosensory systems can result in behavioural abnormalities. In marin...
Article
Full-text available
Fish embryos may be vulnerable to seawater acidification resulting from anthropogenic carbon dioxide (CO 2 ) emissions or from excessive biological CO 2 production in aquaculture systems. This study investigated CO 2 effects on embryos of the European eel ( Anguilla anguilla ), a catadromous fish that is considered at risk from climate change and t...
Preprint
Full-text available
Background Progressive climate-induced ocean acidification (OA) impacts marine life in ways that are difficult to predict but are likely to become exacerbated over generations. Although marine fishes can balance internal acid-base homeostasis efficiently, indirect ionic regulation effects that alter neurosensory systems can result in behavioural ab...
Presentation
Full-text available
Les acides gras (AG) polyinsaturés à longue chaîne de la série n-3 (n-3 PUFA) comme les acides docosahexaénoïque (DHA) et eicosapentaénoïque (EPA) sont les composants majoritaires des membranes cellulaires de tous les organismes vivants, et sont nécessaires au maintien des fonctions physiologiques. En milieu naturel, ils sont produits par les produ...
Presentation
Full-text available
Long-chain omega-3 polyunsaturated fatty acids (n-3 PUFA) are involved in the structure and the function of all living organism’s membranes, and thus play a key role in several physiological functions. Capacities of n-3 PUFA synthesis by marine fish species are limited, but are expected to fluctuate depending on fish life histories and environmenta...
Article
Targeting in zebrafish fast growth, high survival rates and improved reproductive performance has led over the last years in variable feeding regimes between different facilities. Despite its significance on fish function and welfare, normal skeletal development has rarely been evaluated in establishing the best feeding practices for zebrafish. The...
Article
Full-text available
Coastal nursery areas are subjected to a wide range of natural and anthropogenic stressors, including global warming, which indirectly influence trophic food webs. A global rarefaction of n-3 polyunsaturated fatty acids (PUFA) in trophic networks is in progress. The aim of this study was to assess the effect of a reduction in the dietary availabili...
Article
Plastic pollution is a source of chemical to the environment and wildlife. Despite the ubiquity of plastic pollution and thus plastic additive in the environment, plastic additives have been studied to a limited extend. As a prerequisite to a study aiming to evaluate the leaching of a common additive used as an antioxidant (Irgafos® 168) from polye...
Article
Elevated amounts of atmospheric CO2 are causing ocean acidification (OA) that may affect marine organisms including fish species. While several studies carried out in fish revealed that OA induces short term dysfunction in sensory systems including regulation of neurons activity in olfactory epithelium, information on the effects of OA on other phy...
Article
Full-text available
The decrease in ocean pH that results from the increased concentration of dissolved carbon dioxide (CO2) is likely to influence many physiological functions in organisms. It has been shown in different fish species that ocean acidification (OA) mainly affects sensory systems, including olfaction. Impairment of olfactory function may be due to a dys...
Article
The role of phenotypic plasticity in the acclimation and adaptive potential of an organism to global change is not currently accounted for in prediction models. The high plasticity of marine fishes is mainly attributed to their early stages, during which morphological, structural and behavioural functions are particularly sensitive to environmental...
Article
Optimizing the metabolic use of these carbohydrate-rich plant products in fish feeds could be achieved through nutritional programming strategies of fish larvae. The present study aims at testing the long-term effect of an early-life high-carbohydrate nutritional (34% of starch in the feed) stimulus in European sea bass (Dicentrarchus labrax), by e...
Article
Full-text available
To meet the growing demand of fish feed for aquaculture, an increasing proportion of marine ingredients are being replaced by blends of plant products. However, the total replacement of marine ingredients in salmonid diets impairs fish performance. This is particularly true during the early fry stage and this stage is therefore considered of partic...
Data
Sequence of primers used for gene expression analysis by real-time PCR. (XLSX)
Data
Fold changes and p-value associated with each gene found differentially expressed among the three genotypes, identified as potential molecular markers linked to plant-based diets utilisation. (XLSX)
Data
GO terms found significantly enriched (Cut-off: p-value<0.01; Benjamini<0.1). (XLSX)
Article
Full-text available
Marine plastic pollution is a major environmental issue. Given their ubiquitous nature and small dimensions, ingestion of microplastic (MP) and nanoplastic (NP) particles and their subsequent impact on marine life are a growing concern worldwide. Transfers along the trophic chain, including possible translocation, for which the hazards are less und...
Article
Environmental conditions, to which organisms are exposed during all their life, may cause possible adaptive responses with consequences in their subsequent life-history trajectory. The objective of this study was to investigate whether ecologically relevant combinations of hypoxia (40% and 100% air saturation) and temperature (15° and 20 °C), occur...
Article
Several physiological functions in fish are shaped by environmental stimuli received during early life. In particular, early-life hypoxia has been reported to have long-lasting effects on fish metabolism, with potential consequences for fish life history traits. In the present study, we examine whether the synergistic stressors hypoxia (40% and 100...
Article
Full-text available
Temperature is important for optimization of rearing conditions in aquaculture, especially during the critical early life history stages of fish. Here, we experimentally investigated the impact of temperature (16, 18, 20, 22 and 24˚C) on thermally induced phenotypic variability, from larval hatch to first-feeding, and the linked expression of targe...
Article
Full-text available
Ocean acidification is a recognized consequence of anthropogenic carbon dioxide (CO2) emission in the atmosphere. Despite its threat to marine ecosystems, little is presently known about the capacity for fish to respond efficiently to this acidification. In adult fish, acid-base regulatory capacities are believed to be relatively competent to respo...
Article
European sea bass (Dicentrarchus labrax) inhabits coastal waters and may be exposed to hypoxia at different life stages, requiring physiological and behavioral adaptation. In the present study, we attempted to determine whether regulation of hemoglobin (Hb) gene expression plays a role in the physiological response to chronic moderate hypoxia in wh...
Article
Full-text available
Ocean warming, eutrophication and consequent decrease in oxygen lead to smaller average fish size. Although such responses are well-known in an evolutionary context, involving multiple generations, it appears to be incompatible with current rapid environmental change. Rather, phenotypic plasticity could provide a means for marine fish to cope with...
Article
Full-text available
Background The better understanding of how intestinal microbiota interacts with fish health is one of the key to sustainable aquaculture development. The present experiment aimed at correlating active microbiota associated to intestinal mucosa with Specific Growth Rate (SGR) and Hypoxia Resistance Time (HRT) in European sea bass individuals submitt...
Poster
Full-text available
The pace-of-life syndrome (POLS) hypothesis1 specifies that closely related species experiencing different ecological conditions should differ in a suite of metabolic traits that have coevolved with the life-history particularities . The notion of POLS finds its roots in the classic concept of r and K-selection. It also extends into the more recent...
Article
Maternal mRNA governs early embryonic development in fish and variation in abundance of maternal transcripts may contribute to variation in embryonic survival and hatch success in European eel, Anguilla anguilla. Previous studies have shown that quantity of the maternal gene products β-tubulin, insulin-like growth factor 2 (igf2), nucleoplasmin (np...
Article
Full-text available
The objective of this study was to evaluate the combined effects of thermal acclimation and n-3 highly unsaturated fatty acids (n-3 HUFA) content of the food source on the aerobic capacities of fish in a thermal changing environment. The model used was the golden grey mullet Liza aurata, a species of high ecological importance in temperate coastal...
Article
Full-text available
Hypoxia episodes have been generally studied over the last decade for their lethal consequences in coastal areas, which are nurseries for several fish species. The possible long-lasting effects of non-lethal hypoxia exposures at larval stage are, however, poorly documented. We investigated the long-lasting phenotypic impact of an experimental expos...
Article
Full-text available
Since European sea bass (Dicentrarchus labrax) larvae occurred in coastal and estuarine waters at early life stages, they are likely to be exposed to reduced dissolved oxygen waters at a sensitive developmental stage. However, the effects of hypoxia at larval stage, which depend in part on fish species, remain very poorly documented in European sea...
Article
Full-text available
BACKGROUND: Senegalese sole (Solea senegalensis) and common sole (S. solea) are two economically and evolutionary important flatfish species both in fisheries and aquaculture. Although some genomic resources and tools were recently described in these species, further sequencing efforts are required to establish a complete transcriptome, and to ide...
Article
Full-text available
Based on the concept of nutritional programming in mammals, we tested whether an acute hyperglucidic-hypoproteic stimulus during first feeding could induce long-term changes in nutrient metabolism in rainbow trout. Trout alevins received during the five first days of exogenous feeding either a hyperglucidic (40% gelatinized starch + 20% glucose) an...
Article
Full-text available
In this study, we hypothesised that a reduction in n-3 HUFA availability for higher consumers, as expected with global change, would negatively impact the physiological performances of fish. The aim was to experimentally evaluate the effect of n-3 HUFA dietary content on cardio-respiratory performances of the golden grey mullet (Liza aurata), a mic...
Conference Paper
Contemporary environmental trends are impacting the functioning and productivity of numerous marine coastal ecosystems, with perceived socio-economic consequences. In order to reduce the treat to ecosystems’ services and in particular the fisheries, there is a need to improve current predicting ability with regard to the capacity of fish species to...
Article
Protein hydrolysate is an essential component of dry starter diets for fish larvae, as promoting healthy development. Peptides are also suitable substrates for many intestinal microbes. Five experimental diets were compared to a control diet (CONT) supplemented with a commercial fish protein hydrolysate. Each diet contained one marine protein hydro...
Article
Full-text available
The release of polycyclic aromatic hydrocarbons (PAHs) into the environment has increased very substantially over the last decades leading to high concentrations in sediments of contaminated areas. To evaluate the consequences of long-term chronic exposure to PAHs, zebrafish were exposed, from their first meal at 5 days post fertilisation until the...
Article
The aim of this work was to investigate the catabolic process of three kinds of dietary carbohydrates in the gut of sea bass juveniles, with the possible contribution of the intestinal microbiota to the nutrition of the host, and the subsequent effects on intermediary metabolism. A first diet contained waxy maize (99% amylopectin), a highly digesti...
Article
Full-text available
The aim of this study was to determine whether mortality observed during the larval development of reared bluefin tuna (Thunnus thynnus) could be related to improper expression profiles of key genes involved in digestive or antioxidant response capabilities. Tuna larvae were sampled at hatching, 2, 5, 10, 15 and 20 dph (days post hatching) for the...
Article
Full-text available
Coastal systems could be affected by hypoxic events brought about by global change. These areas are essential nursery habitats for several fish species including the common sole (Solea solea L.). Tolerance of fish to hypoxia depends on species and also on their physiological condition and nutritional status. Indeed, high dietary lipid content has b...
Conference Paper
Full-text available
Coastal ecosystems which are nursery areas for many marine fish species are more frequently and severely affected by hypoxia episodes over the past 50 years due to global warming and eutrophication. The present study aims at understanding the short and long-term effects on physiological functions and to evaluate the consequences in term of life-tra...
Article
Full-text available
An individual's environmental history may have delayed effects on its physiology and life history at later stages in life because of irreversible plastic responses of early ontogenesis to environmental conditions. We chose a marine fish, the common sole, as a model species to study these effects, because it inhabits shallow marine areas highly expo...
Article
Probiotics may have many effects on health and development of fish larvae. One of the most promising is related to spinal conformation, though the mode of action is not clearly understood. The present study attempted to investigate the effects of two strains of lactic acid bacteria on associated microbiota, histological development and gene express...
Chapter
Substantial progress in pisciculture has been made in the last two decades, but many unidentified parameters that can still affect juvenile quality and, therefore, limit the costeffectiveness of the production represent an industrial bottleneck. The most critical phase of the whole production cycle is probably the larval period. To control this pha...
Article
Marine fish species exhibit low capacity to biosynthesise highly unsaturated fatty acid (HUFA) in comparison to strict freshwater and anadromous species. It is admitted that the Delta(6) desaturase (FADS2) is a key enzyme in the HUFA biosynthetic pathway. We investigated by quantitative PCR the relative amounts of FADS2 mRNA in European sea bass (D...
Article
Full-text available
The aim of this study was to determine whether dietary cholecalciferol affects the recruitment and growth of axial skeletal muscle fibers in first-feeding European sea bass. Larvae were fed diets containing 0.28 (VD-L, low dose), 0.69 (VD-C, control dose), or 3.00 (VD-H, high dose) mg cholecalciferol/kg from 9 to 44 d posthatching (dph). Larvae wer...
Data
Fatty acid composition in muscle of two European sea bass half-sibfamilies fed FD or VD. Composition in terms of the main fatty acids (% of total fatty acids) in neutral lipid and phospholipid fractions in muscle of each of the half-sibfamilies (g and G) of European sea bass fed FD or VD. Effects of diet factor and half-sibfamily factor on fatty ac...
Data
Significantly enriched biological processes associated with genes regulated by diet and half-sibfamily factors (EASE, P < 0.05). The main biological processes enriched out of those associated with genes that were over-expressed in fish fed VD were related to physiological process, metabolism (sterol metabolism, carboxylic metabolism, amino acid met...
Data
Comparison of Ct values for ef1 gene between the dietary groups. Quantitative PCR did not reveal any significant difference (t-student test, p > 0. 1) between Ct values for Ef1 between the dietary groups (FD: Fish diet; VD: Vegetable diet; G: G-sibfamily; g: g-sibfamily).
Article
Full-text available
Efforts towards utilisation of diets without fish meal (FM) or fish oil (FO) in finfish aquaculture have been being made for more than two decades. Metabolic responses to substitution of fishery products have been shown to impact growth performance and immune system of fish as well as their subsequent nutritional value, particularly in marine fish...
Article
Full-text available
Background: Efforts towards utilisation of diets without fish meal (FM) or fish oil (FO) in finfish aquaculture have been being made for more than two decades. Metabolic responses to substitution of fishery products have been shown to impact growth performance and immune system of fish as well as their subsequent nutritional value, particularly in...
Article
Full-text available
Background: Efforts towards utilisation of diets without fish meal (FM) or fish oil (FO) in finfish aquaculture have been being made for more than two decades. Metabolic responses to substitution of fishery products have been shown to impact growth performance and immune system of fish as well as their subsequent nutritional value, particularly in...