Éditeur(s) : Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1985
Résumé : SATMAR has developed techniques and methods allowing a production of over 100 million spat per year at a size from 2 to 10 millimetres. Among the 13 species concerned by this production, 3 of major importance are the oysters Crassostrea gigas, Ostrea edulis and the Japanese little neck clam, Ruditapes philippinarum . The hatchery production could easily be doubled if the market would increase. Current research tend to increase the quality of the products by means of genetics and to lower the costs by improving the nursery phase.
La Société Atlantique de Mariculture a développé des techniques et des méthodes permettant la production annuelle de plus de l00 millions de naissains d'une taille de 2 à 10 millimètres. Parmi les 13 espèces concernées par ces productions les 3 principales sont les huîtres Crassostrea gigas, Ostrea edulis, et la palourde du Pacifique, Ruditapes philippinarum. La production de l'écloserie pourrait facilement doubler si le marchess développait. Les recherches actuelles portent sur l'amélioration de la qualité des produits par la sélection génétique et un abaissement du prix de revient par l'optimisation des performances au niveau de la phase nurserie.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/1983/acte-1184.pdf
http://archimer.ifremer.fr/doc/00000/1184/

Éditeur(s) : HAL CCSD Public Library of Science
Résumé : International audience
BACKGROUND: We aimed to assess, for the first time, the nature of the indoor air contamination of hospitals. METHODS AND FINDINGS: More than 40 volatile organic compounds (VOCs) including aliphatic, aromatic and halogenated hydrocarbons, aldehydes, alcohols, ketones, ethers and terpenes were measured in a teaching hospital in France, from sampling in six sampling sites--reception hall, patient room, nursing care, post-anesthesia care unit, parasitology-mycology laboratory and flexible endoscope disinfection unit--in the morning and in the afternoon, during three consecutive days. Our results showed that the main compounds found in indoor air were alcohols (arithmetic means ± SD: 928±958 µg/m³ and 47.9±52.2 µg/m³ for ethanol and isopropanol, respectively), ethers (75.6±157 µg/m³ for ether) and ketones (22.6±20.6 µg/m³ for acetone). Concentrations levels of aromatic and halogenated hydrocarbons, ketones, aldehydes and limonene were widely variable between sampling sites, due to building age and type of products used according to health activities conducted in each site. A high temporal variability was observed in concentrations of alcohols, probably due to the intensive use of alcohol-based hand rubs in all sites. Qualitative analysis of air samples led to the identification of other compounds, including siloxanes (hexamethyldisiloxane, octamethyltrisiloxane, decamethylcyclopentasiloxane), anesthetic gases (sevoflurane, desflurane), aliphatic hydrocarbons (butane), esters (ethylacetate), terpenes (camphor, α-bisabolol), aldehydes (benzaldehyde) and organic acids (benzoic acid) depending on sites. CONCLUSION: For all compounds, concentrations measured were lower than concentrations known to be harmful in humans. However, results showed that indoor air of sampling locations contains a complex mixture of VOCs. Further multicenter studies are required to compare these results. A full understanding of the exposure of healthcare workers and patients to complex mixtures of chemical compounds can then be related to potential health outcomes.
ISSN: 1932-6203

hal-00874694
https://hal.archives-ouvertes.fr/hal-00874694
https://hal.archives-ouvertes.fr/hal-00874694/document
https://hal.archives-ouvertes.fr/hal-00874694/file/VOC_Contamination-accepted.pdf
DOI : 10.1371/journal.pone.0055535

Éditeur(s) : HAL CCSD Springer Verlag
Résumé : International audience
Color polymorphism is widespread in animals and can be associated with temporary adjustments to environmental variables (phenotypic plasticity). In teleost fishes, one of the most remarkable examples of color plasticity is background adaptation in flatfishes. However, such rapid and complete changes in body color and pattern remain relatively unreported in other species. The convict surgeonfish Acanthurus triostegus is a gregarious species whose body color pattern consists of black vertical bars on a whitish body. Here, we describe an entirely reverse body color pattern (white vertical bars on a blackish body) that we observed in some A. triostegus juveniles in a nursery area at Moorea Island, French Polynesia. In aquaria, we determined that change from one color pattern to the other is rapid, reversible, and corresponds to phenotypic plasticity associated with aggressive behavior.
ISSN: 0722-4028

hal-01628304
http://hal.upmc.fr/hal-01628304
http://hal.upmc.fr/hal-01628304/document
http://hal.upmc.fr/hal-01628304/file/Besson_2017_Complete_and_rapid.pdf
DOI : 10.1007/s00338-017-1631-4

Éditeur(s) : Proceedings of the 59th Annual Gulf and Caribbean Fisheries Institute
Résumé : In most of marine fishes cultured, larvae in their early development are fed with live prey (rotifer and/or artemia). In hatcheries, culture of these preys is labour consuming, needs specific facilities and represent an important part of production cast. On the other hand, world artemia production is subjected to fluctuation of harvest in the wild which could Iimit fish farming industry in the near future. A dried formula adapted to marine fish larvae has been perfected by Ifremer's center of Brest (France) and is distributed by a feeding company since 1999. This artificial microbound diet has been successfully tested on several temperate fishes such as European seabass (Dicentrarchus labrax), Atlantic cod (Gadus morhua) or European seabream (Sparus aurata) in a co-feeding (i.e. artemia and dried diet) strategy. Experiments described here were carried out ta evaluate the performances obtained during total substitution of artemia by this diet in Red drum (Sciaenops ocellatus) larval culture. ln 2004 and 2005, four experiments were conducted on feed technology aspects (experimental or industrial manufacturing), weaning strategy (direct or co-feeding) and feed distribution method (prototypes or classical self feeder) in comparison to the standardized method using live preys. At the end of larval phase (day 15) and at day 30, end of nursery phase (0.6 g), survival relative to control (RTC) was respectively 96.9% and 111.0% in the best treatment. Concerning growth, the weight RTC reached at day 15 and day 30 was respectively 82.8% and 72.4%. However, it is important to note that rearing protocols have to be adapted ta the use of these micro pellets in order toprevent degradation of culture quality. These results show that this new product can be applied on industrial scale in private hatcheries. But further research is needed ta evaluate replacement of rotifers by this dried formula in order to completely eliminate live prey in larval culture of Red drum.
Dans la plupart des poisons marins élevés, les larves sont nourries avec des proies vivantes (rotifères et/ou artémia) au début de leur développement. Dans les écloseries, la culture de ces proies est consommatrice de main d'oeuvre, nécessite des installations spécifiques et entre pour une part importante dans le coût de production. Par ailleurs, la production mondiale d'artémia est dépendante de la fluctuation des récoltes dans le milieu naturel, ce qui pourrait gêner la filière piscicole marine dans un futur proche. Une formulation alimentaire inerte adaptée aux larves de poisson marin a été mise au point par le centre Ifremer de Brest (France) et est commercialisée par un provendier depuis 1999. Ces microparticules artificielles ont été testée avec succès sur plusieurs poissons tempérés comme le bar européen (Dicentrarchus labrax), la morue atlantique (Gadus morha) ou la daurade européenne (Sparus aurata) dans un contexte de co-feeding (i.e. artémia et aliment inerte). Les expériences décrites ici ont été menées afin d'évaluer les performances obtenues lors de la substitution totale des artémia par cet aliment dans l'élevage larvaire de l'ombrine (Sciaenops ocellatus). En 2004 et 2005, quatre expériences ont été menées sur l'aspect technologie alimentaire (fabrication expérimentale ou industrielle), la stratégie de sevrage (direct ou co-feeding) et le mode de distribution de l'aliment (distributeur classique ou prototypes) en comparaison au standard sur proies vivantes. En fin de phase larvaire (jour 15) et au jour 30 après une phase de prégrossissement (0.6g), la survie par rapport au témoin (RTC) était respectivement de 96.9% et 111 .1% dans le meilleur traitement. Concernant la croissance, les poids obtenus aux jours 15 et 30 atteignaient respectivement 82.8% et 72.4%. Cependant il est important de relever que les protocoles d'élevage doivent être adaptés à l'utilisation de ces microparticules afin de prévenir une dégradation de la qualité d'élevage. Ces résultats montrent que ce nouveau produit peut être appliqué à l'échelle industrielle dans les écloseries privées. Cependant, les recherches doivent être poursuivies pour évaluer les possibilités de remplacement des rotifères par ces aliments inertes afin de s'affranchir complètement de l'utilisation de proies vivantes dans l'élevage larvaire de l'ombrine.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/2006/acte-6597.pdf
http://archimer.ifremer.fr/doc/00000/6597/

Éditeur(s) : Elsevier
Résumé : Vibriosis is a major disease problem in shrimp aquaculture, affecting all developmental stages, from larvae in hatchery tanks to juveniles and broodstock in growout ponds. However, bacterial strains responsible for vibriosis in the successive stages are usually considered to be different, and virulence specificity has been reported both at the species and at the stage levels. The so-called « Syndrome 93 » is a seasonal juvenile vibriosis caused by Vibrio penaeicida which affects Penaeus stylirostris in growout ponds and broodstock tanks in New Caledonia. This pathology does not cause any mortality in hatchery or nursery phases. An experimental infection design using balneation of postlarvae and early juveniles in V. penaeicida suspensions was used to evaluate the developmental stage at which shrimp become sensitive to this vibriosis. We demonstrated that the acquisition of susceptibility to this pathogen is very sudden and correlated with the acquisition of the definitive rostral formula, and from this draw conclusions regarding virulence mechanisms of V. penaeicida in P. stylirostris.
Aquaculture (Elsevier), 1998-12 , Vol. 169 , N. 3-4 , P. 291-296

Droits : 1998 Elsevier Science B.V. All rights reserved
http://archimer.ifremer.fr/doc/1998/publication-383.pdf
DOI:10.1016/S0044-8486(98)00380-9
http://archimer.ifremer.fr/doc/00000/383/