Christophe Stavrakakis

Christophe Stavrakakis
Institut Français de Recherche pour l'Exploitation de la Mer | Ifremer

About

23
Publications
2,180
Reads
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202
Citations
Citations since 2017
17 Research Items
145 Citations
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20172018201920202021202220230204060
20172018201920202021202220230204060

Publications

Publications (23)
Article
Triploid cupped oysters represent an advantage over diploid oysters due to their faster growth and their whole year marketable span, especially during the spawning season occurring in the summer. Thus, their commercialization during this warm season could present a risk for human health due to the proliferation of human-pathogenic Vibrio spp. such...
Article
Diseases represent a major threat for the bivalve production industry. Their control relies on biosecurity measures to prevent their introduction and limit their spread. When maintained in hatcheries, nurseries and depuration centers, bivalves can become infected from the surrounding water and might release pathogens through wastewater effluents. A...
Article
Shellfish farming, a key sector of French aquaculture activity, allows the production of oyster spat in a controlled environment. Their production in commercial hatcheries requires control over the quality of the seawater used to sustain crossbreeding, breeding, and the production of fodder microalgae. Therefore, improving the filtration conditions...
Article
Full-text available
The microalga Haslea ostrearia is known as a diatom with the peculiarity of producing a water soluble blue-green pigment called marennine. This pigment has antibacterial activities against pathogenic bacteria of bivalves produced in aquaculture. The present study evaluates the effect of culture supernatant of the diatom Haslea ostrearia containing...
Article
The process of ultrafiltration (UF) of natural seawater often encounters the problems of variation in water quality and coastal blooms. To validate the feasibility of UF in shellfish farms, this study compared the hydraulic performance and pollutant removal efficiency of the UF process with those of the commonly used treatments that combine several...
Article
Full-text available
Among water treatment processes, ultrafiltration is known to be efficient for the elimination of microorganisms (bacteria and viruses). In this study, two pathogens were targeted, a bacterium, Vibrio aestuarianus and a virus, OsHV-1, with the objective to produce high quality water from seawater, in the case of shellfish productions. The retention...
Article
Full-text available
The culture of microalgae is important for the production and maintenance of bivalves. One of the major challenges is to maintain the reliability of microalgae forages over the long term. The aim of this work is to use Ultrafiltered (UF) seawater to cultivate them. Thus, cultures in a volume of 300 L of 2 species of microalgae Tetraselmis and T-iso...
Article
Full-text available
The main objective of this paper is to study the effect of new air backwash on dead-end ultrafiltration of seawater with a pilot at semi-industrial scale (20 m 3 /day). To control membrane fouling, two different backwashes were used to clean the membrane: classical backwash (CB) and new air backwash (AB) that consists of injecting air into the memb...
Presentation
Skeletonema marinoi, a marine diatom-blooming species in temperate coastal waters, is a microalgae commonly used as food in shellfish hatcheries. Cell mortality is a key mechanism that shapes phytoplankton blooms and species dynamic in aquatic environment.Phytoplankton lysis has been associated with release of chemical compounds that have been show...
Article
Shellfish profession is jeopardized by water quality problem that concerns inlet, with the need to protect the animals from pathogens contaminations, and effluents potentially harmful for the environment with the presence of pathogens, nutrients or organic matter. In this study, ultrafiltration was tested to answer these issues. The objective of th...
Article
Full-text available
Haslea ostrearia is a marine diatom that can feed oysters. This study aimed to cultivate H.ostrearia in the following media: seawater (SW), seawater filtered by activated carbon (SW+CA), and drilling water (DW). The three-water media were supplemented with two types of nutrients, Walne-Conway+silica (CS) and ES-1/3 Provasoli (P), leading to a six e...
Article
Triploid oysters are favoured by the aquaculture industry because of their sterility, which results in two advantages: a faster growth than natural oysters and a constant quality throughout all the year, which is attractive for consumers. In France, these oysters are mainly produced by mating natural and tetraploid oysters whose production poses a...
Article
Full-text available
Among all the techniques studied to overcome fouling generated in dead-end filtration, the injection of air during backwashes proved to be the most effective. Indeed, shear stress engendered by the two-phase flow enhanced particle removal on membrane surface. This work aims to study the injection of air to drain the membranes before backwash. First...
Article
Une procedure analytique associant la chromatographie liquide et la spectrometrie de masse en tandem (CL-SM/SM) a ete developpee pour la determination d'hormones steroides, d'alkylphenols et du bisphenol A dans des eaux chargees en matieres organiques (eaux usees domestiques). Deux protocoles d'extraction en phase solide ont ete developpes pour les...
Article
Full-text available
The biodegradation of 17 beta-estradiol (E2) and bisphenol A (BPA) was compared to that of a reference pollutant, sodium benzoate (SB), known for its high biodegradability. The biodegradation was measured using the Sturm test (ISO 9439 modified Sturm test). The susceptibility of the target pollutants to be degraded by microorganisms of activated sl...
Article
Full-text available
The determination of steroid hormones, alkylphenolic compounds and bisphenol A at the ng l(-1) level in environmental water samples (surface water and WasteWater Treatment Plant samples (WWTP)) is performed by a specific analytical procedure. Pre-concentration by solid-phase extraction conditions was optimized using C18 cartridges for steroid hormo...
Article
Industrialization and the intensive use of domestic chemical products lead to the spreading of various substances considered as emerging pollutants. Thus, the scientific community has focused its attention the past ten years on their fate in the environment. Among them, some compounds can interfere with the normal endocrine functions of wildlife an...
Article
Full-text available
This paper presents an analytical method applied to the determination of 3 natural steroid hormones, estrone, 17 beta-estradiol, and 16 alpha-hydroxyestrone, and the contraceptive estrogen, 17 alpha-ethynylestradiol, at the sub-ng/L level in water samples [surface water and wastewater treatment plant (WWTP) samples]. The solid-phase extraction cond...
Article
Two photoactive TiO2-supported materials are considered for toluene degradation in the gas phase. A kinetic study is performed over these two catalysts. The mechanisms involved are well represented by the Langmuir-Hinshelwood (L-H) relation at initial time. The kinetic rates and adsorption constants are then calculated to compare the catalysts. Par...

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Projects

Project (1)
Project
CocoriCO2 is an interdisciplinary project which aims to increase resilience, sustainability and competitiveness of the French shellfish industry, considering environmental risks and more particularly ocean acidification. It is funded by the European Maritime and Fisheries Fund (EMFF) for a total amount of 1.5 M€. To achieve this objective, we propose an innovative partnership between ecologists specialized in shellfish and environment interactions (IFREMER), biogeochemists recognized for their work on ocean acidification (CNRS), representatives of the sector at the national (CNC) and regional levels (CRC Bretagne Nord and Méditerranée) involved in the implementation and monitoring of the project. The project is based on several complementary disciplines, i.e. ecology, bio-geochemistry, physiology, economics and social sciences, well covered by the partnership. The specific objectives of the project consist in observing, analyzing, anticipating and remedying the effects of environmental changes (seawater acidification and warming) on shellfish farming in order to assess the vulnerability of ecosystems, farmed species and businesses to environmental change and more particularly the risk of "acidification". These four operations consist of: 1. observing the natural variability of the seawater pH (acidity) at high frequency over ten production basins representative of the shellfish sector (bays and estuaries, lagoons and nurseries), in relation to other parameters of the carbonate chemistry and the environment, 2. analyzing the impacts of acidification and warming on the growth of the most cultivated bivalves in France (oysters and mussels) during a complete life cycle in a farming situation, 3. anticipating the impacts of acidification and warming on the economy of the shellfish farming sector by integrating the adaptive capacities and the vulnerability of ecosystems and business, 4. remedying the effects of ocean acidification by testing re-vegetation and alkalizing techniques.