Consulta: creatorFacets:"Merceron, Michel"
Registros recuperados: 47
Data/hora: 03/06/2024 08:08:07

Impact du barrage d'Arzal sur la qualité des eaux de l'estuaire et de la baie de la Vilaine
Provedor de dados: 5
Autores: Merceron, Michel.
The Arzal dam upon the Vilaine estuary provokes an aggravation of a recurrent summer hypoxia of the bottom waters in the bay of  Vilaine.
Tipo: Text
Palavras-chave: Suspended sediments; Salinity; Coastal zone; Dam estuary; Oxygen depletion; Matières en suspension; Salinité; Zone côtière; Estuaire; Barrage; Anoxie.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-2658.pdf

Impact de la pisciculture marine intensive sur l'environnement. Revue bibliographique
Provedor de dados: 5
Autores: Videau, Christiane; Merceron, Michel.
A review of the publications concerning the impact of the intensive marine fish farming to the environment was performed. The existing literature is mostly devoted to the salmonids farmed in Scandinavia and Scotland. The results of this review are only partly relevant to the French environment which needs more specific studies. A more extensive abstract is displayed farther on. (not controlled OCR)
Tipo: Text
Palavras-chave: Environnement côtier; Impact; Salmonidés; Pisciculture intensive; Coastal environment; Impact; Salmonids; Intensive fish farming.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/rapport-2656.pdf

Pisciculture marine intensive et environnement
Provedor de dados: 5
Autores: Kempf, Marc; Merceron, Michel; Dosdat, Antoine.
Farmed sea fish production is at the moment relatively undeveloped in France (20 million alevins, 2,600 tonnes of fish, 165 million francs), but it has growth potential that is yet to be exploited. Installation plans are eliciting a great variety of reactions depending upon the areas of the shoreline. The various objections, often passionate, generally rely upon environmental arguments. And yet, objective data that would make it possible to evaluate the latter are in large part lacking. The government, accustomed to regulating fresh water, lacks benchmarks and experience in the marine environment. Property developers need basic outlines and data to build their cases. Scientists are called upon, in a national and international plan, to help aquafarming grow...
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-2628.pdf

Impact du régime du barrage d'Arzal sur la stratification a l'embouchure de la Vilaine : étude par modélisation numérique
Provedor de dados: 5
Autores: Le Hir, Pierre; Duchene, C.; Merel, A; De Nadaillac, G.; Merceron, Michel; Breton, Marguerite.
The rate of flow of the fresh water releases at the Arzal Dam into the Vilaine is likely to influence the haline structure of Vilaine Bay. In order to determine the rate of flow that causes a minimum downstream stratification, a vertical two-dimensional mathematical modelling of the Vilaine's estuary was undertaken. We obtain very similar stratification flows for different fresh water release scenarios, in spite of the rather different desalinisations and currents.
Tipo: Text
Palavras-chave: Water release; Stratification; Estuary; Numerical model; Vilaine; Rejet de barrage; Stratification; Estuaire; Modèle numérique; Vilaine.
Ano: 1986
URL: https://archimer.ifremer.fr/doc/1986/rapport-2654.pdf

Baie de Vilaine : juillet 1982 mortalité massive de poissons l'analyse des causes et des mécanismes du phénomène, les propositions d'actions
Provedor de dados: 5
Autores: Merceron, Michel.
At the end of July 1982, a massive number of fish and benthic invertebrates died in Vilaine Bay. The mass of fish concerned has been estimated at several tens of tonnes. The analysis of the event's conditions indicates that it was asphyxiation caused by a very pronounced depletion of dissolved oxygen in the bay's bottom waters. The appearance of toxic phytoplankton in the years that followed (Dinophysis) is aseparate topic of research by IFREMER.   The most likely mechanism of that anoxia is a succession of events: (1) a first flood of Vilaine River inducing a vertical stratification of waters in Vilaine Bay, (2) an intense and superficial bloom of marine phytoplankton, (3) a stormy weather breaking up the stratification and mixing superficial...
Tipo: Text
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/publication-2833.pdf

Etude de la matière organique et demande en oxygène des sédiments en baie de vilaine
Provedor de dados: 5
Autores: Merceron, Michel.
After the fish mortality through an anoxia, which occured during the summer of 1982 in the bay of Vilaine, the oxygen consumption of the sediment was investigated during spring and summer. It was found moderately important, submitted to limited evolutions along time and on different zones. A significant correlation with the organic carbon content of sediment could not be established.    The oxygen consumption of the bottom waters was approached. In the bay of Vilaine as a whole, it was found more important than the sediment consumption. It could vary in a wide range, till leading to pronounced hypoxias, especially during phytoplankton. (Not controlled OCR)
Tipo: Text
Palavras-chave: Organic matter; Water oxygen consumption; Sediment oxygen consumption; Anoxia; Dissolved oxygen; Coastal waters; Matière organique; Respiration de la phase liquide; Respiration du sédiment; Anoxie; Oxygène dissous; Eaux côtières.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/rapport-2666.pdf

L'eutrophisation des eaux marines et saumâtres en Europe, en particulier en France
Provedor de dados: 5
Autores: Menesguen, Alain; Aminot, Alain; Belin, Catherine; Chapelle, Annie; Guillaud, Jean-francois; Joanny, Michel; Lefebvre, Alain; Merceron, Michel; Piriou, Jean-yves; Souchu, Philippe.
In order to be able to count the cases of coastal eutrophication and to propose methods to monitor as well as to reduce these phenomena, first of all it is necessary to precisely define the word eutrophication itself. Instead of the strict etymological definition, that is to say a progression of the enrichment of a medium, we will rather retain the concept of a state enriched at a point such as it causes harmful effects on the ecosystem, and nuisances to man's activities. Based on the average chemical equations of the organic matter synthesis/degradation in the sea, this operational definition thus puts forwards the harmful consequences of enrichment, i.e. the production of an excessive algal biomass, sometimes unbalanced from the point of view of...
Tipo: Text
Palavras-chave: Alexandrium; Phaeocystis; Monostroma; Ulva; Dilution plume; Water trapping; Anoxia; Nitrogen and phosphorus loadings; Red tides; Phytoplankton blooms; Green tides; Eutrophication; Alexandrium; Phaeocystis; Monostroma; Ulva; Panache de dilution; Confinement; Anoxie; Phosphate; Nitrate; Apports terrigènes; Eaux colorées; Blooms phytoplanctoniques; Marées vertes; Eutrophisation.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-22.pdf

In situ growth potential of the subtidal part of green tide forming Ulva spp. stocks
Provedor de dados: 5
Autores: Merceron, Michel; Antoine, Virginie; Auby, Isabelle; Morand, P.
Ulva spp., the algae most responsible for green tides in Brittany (France), are found on the foreshore and in the most beachward wave area (MBWA) of many bays during green tide phenomena. These algae have recently been seen drifting at greater depths (reaching -20 m). In view of the significant quantities of algae found at these depths, and the less favorable conditions for algal growth than in the intertidal zone, we attempted to determine if they could grow there. For that, during their maximum growth period (from May to July), algae were picked up at three stations located on the foreshore, in the MBWA and in the subtidal (deep) zones of the Bay of Douarnenez, and their nitrogen, carbon and chlorophyll a+b contents were determined, and their...
Tipo: Text
Palavras-chave: Nutrients; Irradiance; Photosynthesis; Ulva sp.; Algal blooms; Eutrophication.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3527.pdf

Impact de la pisciculture marine intensive sur l'environnement : (2) l'environnement d'un site d'élevage de salmonidés en cages flottantes, Camaret année 1994
Provedor de dados: 5
Autores: Kempf, Marc; Jacq, E; Le Guellec, C; Merceron, Michel; Monfort, Patrick; Nezan, Elisabeth; Ryckaert, Mireille.
This document presents a year-long (1994) environmental study conducted on a site of intensive farming of salmonids (mainly fario trout) in Camaret Bay. A set of parameters were considered for the body of water and the sea bed (flow patterns, hydrology, sedimentology, biology, chemistry) and complemented by video observations. The study concluded that there was a measurable effect from the farm in its current configuration, but that the impact was of a very limited intensity and scope that did not affect the environment in a substantial way. It is recommended that production growth be accompanied by a minimum amount of environmental assessment.
Tipo: Text
Palavras-chave: Bretagne; Truite fario; Salmonidés; Environnement; Pisciculture marine.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-2834.pdf

Inventaire des Ulves en Bretagne année 1998 - rapport de synthèse
Provedor de dados: 5
Autores: Merceron, Michel.
The 1998 survey of green tides on the Brittany coast was performed in the same way as that of 1997 in order to allow comparison. 11 includes an inventory ofail the concerned sites, and a precise assessment ofthirteen ofthem, the most loaded. On these ones, nitrogen fluxes were surveyed during the critical period, and the green seaweed stock on the beach and in the first waves was quantified. The climatic conditions were opposite between the two years, very dry in spring and summer 1997, and wet in 1998. The irradiance contrast was inverse, and less pronounced. The nitrate contents and mostly the flows were more important in 1998. They generated nitrogen fluxes about 3.3 times those of 1997. The total number of sites concerned in 1998 is clearly higher than...
Tipo: Text
Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-2665.pdf

La dénitratation dans un marais littoral pour lutter contre la prolifération des algues vertes (Kervigen, baie de Douarnenez)
Provedor de dados: 5
Autores: Merceron, Michel; Piriou, Jean-yves; Coic, Daniel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered bV reeds. An experiment was there carried out to assess the nitrogen flux depletion of a sma/l stream, the Kerharo. The last one has a 45 I&lt;m2, mostlv agricultural, drainage basin. Due to its nitrate loadings to the nexl sandy beach, it feeds a green algae (U iva) proliferation. In order to control its nitrogen fluxes, the stream was partly divelted through a part of the marsh (9 ha), before it was allowed ta go back to the main bed. Thus a collapsible weir was set up during severalsprings and summers, i.e. the growing period ofulva. The nitrate stripping off the going through flux is withina60 to 90 % range, thal is important (about...
Tipo: Text
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3335.pdf

Methode de cartographie quantitative des ulves "offshore"
Provedor de dados: 5
Autores: Merceron, Michel; Lunven, Michel.
Recent studies in the bays of Douarnenez and La Forêt-Fouesnant have proved that drifting stocks of « offshore » ulva exist between -2 and -20 meters depth. These stocks are nearly as important in weight as those located in the tidal zone, the only ones which are generally studied. It is likely that such « offshore » stocks also exist elsewhere in Brittany. The sampling method by discrete stations visited by divers, which has been used till now, is considered heavy and not precise enough. The new method involves a film camera set on a fish towed at a speed of a few knots. The fish is kept above the sea bottom at a chosen altitude controlled by a guiderope. The system is sturdy, autonomous, and can be easily transferred from one boat to another. The...
Tipo: Text
Palavras-chave: Brittany; Cartography; Imagery; Method; Offshore ulva; Eutrophication; Bretagne; Cartographie; Imagerie; Méthode; Ulve offshore; Eutrophisation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-1579.pdf

Inventaire des sites possibles pour l'aquaculture sur le littoral du Morbihan - Tome 3
Provedor de dados: 5
Autores: Fleury, Pierre-gildas; Merceron, Michel.
File of selected sites Sector 4 – Gulf of Morbihan Sector 5 – Penerf - Vilaine Sector 6 – the islands
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/rapport-2837.pdf

Inventaire des sites possibles pour l'aquaculture sur le littoral du Morbihan - Tome 1
Provedor de dados: 5
Autores: Fleury, Pierre-gildas; Merceron, Michel.
Volume I – Coastal Environment and Aquafarming Volume II – Aquafarming Potential Volume III – File of Selected Sites
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/rapport-2839.pdf

Courantométrie du site d'élevage de salmonides en grande rade de Cherbourg
Provedor de dados: 5
Autores: Merceron, Michel; Gaffet, Jean-dominique.
Current recordings were performed near the middle of the great breakwater of Cherbourg ("Grande Digue", inner side) during two months of the 1993 summer. The data show that, in this site, the currents drive mostly westwards. They are driving eastwards only during the first half of flood. In the tidal cycle, there is only one current slack, at law tide. The most important velocities are observed during the high tides : 0.5 to 0.6 m.s-1• The fish net pens, which are located there, tend to speed up the undemeath currents and, thus, contribute to scatter the farm effluents. The temperature and salinity records are also displayed. _
Tipo: Text
Palavras-chave: Courant; Cage; Élevage; Poisson; Cherbourg; Current; Net pen; Farm; Fish; Cherbourg.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00082/19330/16924.pdf

Aquaculture marine et littorale
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Merceron, Michel; Goulletquer, Philippe.
Marine fish farming is fairly recent in France and it is still in the process of being developed. On the Atlantic and Channel coasts, it deals mainly with Atlantic salmon (Salma salar), fario trout (Salmonella faria) with l,400 t in 1991, and turbot (Scophthalmus maximus) with 600 t. In Gravelmes a bass (Dicentrarchus labrax) and bream (Sparus auratus) farm (1,000 t) uses water which is heated (Mediterranean production for these two species is around 2,000 t). Although these figures are low compared to French shellfish farming (200,000 t) and foreign fish farms (150,000 t in Norway, for example), they are growing.
Tipo: Text
Palavras-chave: Biocénoses; Conchyliculture; Algoculture; Mesure de Protection; Impact non trophiques; Impact; Aquaculture littorale; Aquaculture marine.
Ano: 1997

Marées vertes en Bretagne : état actuel des connaissances
Provedor de dados: 5
Autores: Merceron, Michel.
On tens of sandy beaches of Brittany, a green seaweed (Ulva) blooms during spring and summer. In the sites where the proliferation is the most important, the total biomass amounted to 20 000 t of wet weight in 1997, at the time of maximum. These "green tides" occur every year in nearly the same locations. They have a very harmful impact on local tourism. In many communes, beached and rotting algae are collected and dumped (43 000 m 3 as a whole in 1997). The main development of biomass takes place between the surf zone and the bare sand.The outbreak requires three coexisting conditions : 1) a sandy beach gently sloping, 2) a weak residual current (i.e. once the tidal back and forth movement has been filtered), 3) a nitrogen loading, even moderate (ammonium...
Tipo: Text
Palavras-chave: Brittany; Eutrophication; Proliferation; Ulva; Marine algae; Bretagne; Eutrophisation; Prolifération; Ulves; Algues marines.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/acte-46.pdf

Apports d'origine agricole et qualité des eaux côtières
Provedor de dados: 5
Autores: Merceron, Michel.
This summary and orientation document concerning the impact of agricultural activities on the quality of coastal waters summarises the main pollution, with the exception of organic microcontaminants. The excess of nutritive contributions is considered to be the most significant problem.
Tipo: Text
Palavras-chave: Discharges; Salubrity; Eutrophication; Water quality; Débits; Salubrité; Eutrophisation; Qualité d'eau.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-2652.pdf

Contribution à l'étude d'impact pour l'extension du port de OUISTREHAM
Provedor de dados: 5
Autores: Merceron, Michel.
De l'agglomération de CAEN à la mer, le canal double le cours de l'Orne sur une distance d'environ 14 km. Au port de OUISTREHAM le canal cominunique avec la mer par deux écluses, et en aval des écluses se trouve la confluence avec l'orne, Jusqu'au niveau des basses mers, le chenal est commun et il est encadré par deux enrochements d'axe N.S. sur une distance de 2 Km (cf. carte n°1). Les débits de l'Orne seraient respectivement de 2 m3/s en étiage, d'environ 21 m3/s en débit moyen et de 70 m3/s en crue. Ce fleuve alimente la sédimentation en matières fines qui se produit à la fois dans le chenal commun a l'aval, et dans l'avant-port soit entre le point de confluence et les écluses. La présente étude (carte n°2) porte sur : - la zone de sédimentation...
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00106/21684/19263.pdf

Inventaire des ulves en Bretagne. Année 1997. Rapport de synthese
Provedor de dados: 5
Autores: Merceron, Michel.
The yearly study of Ulva in Brittany aims at building a time series of its proliferations and corresponding nutrient loadings. The goal is to detect results of wilful loading reductions, and to distinguish them from natural variations. This first actually quantified study is the starting bench-mark of the process. Forty-five concerned sites were listed in 1997. They are nearly the same as in 1988, 1991 and 1994 (previous rough census). The Côtes d'Armor and then the Finistère are the most affected departments. The Morbihan is less and file et Vilaine not at all. Ulva biomass was precisely quantified in about fifteen locations during the growing season, along with nitrogen loadings of local streams (mostly nitrate). The fluxes of nitrogen - the limiting...
Tipo: Text
Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/rapport-1580.pdf

Gestion écologique  de l'étang du fret (Finistère)
Provedor de dados: 5
Autores: Merceron, Michel.
The Frêt Pond at Crozon (Finistère) occupies the southwest part of Frêt's cove in Brest's harbour (fig. 1). This 18-hectare pond was isolated from the harbour by the natural accumulation of a mound of pebbles, which was reinforced by rocks so that it could support the D 155 road. At the free end of this mound, a tide mill had been built in the past, and it is through its release channel that water exchanges currently take place between the Frêt pond and Brest's harbour. The pond's catchment area occupies a surface area of 2.70 km2, of which 1.8 km2 are being farmed and 0.5 are forest area (fig. 1). The average flow over the year is estimated at 58 l/s based on a specific flow of 21.4 l/s/km2. It is therefore about 1.8 million cubic metres of fresh water...
Tipo: Text
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/rapport-2649.pdf

Extension du port du Legue (St Brieuc) étude d'impact sur l'environnement marin
Provedor de dados: 5
Autores: Merceron, Michel; Manaud, Francois; Guillaud, Jean-francois; Monbet, Yves.
The commercial port of the city of St-Brieuc currently has a limited capacity. It is only accessible for low-tonnage ships, and for this reason, cargo is not allowed, which is a contributing factor to its current traffic being limited to 450,000 tonnes per year.  A significant silting-up of the port is diminishing even more its potential for accepting ships. Its future seems, therefore, threatened. Several studies conducted by the Côtes-du-Nord Chamber of Commerce and Industry have concluded that it is necessary to develop a port with greater capacity, which would stimulate the regional economy. Cargo traffic would then reach 1 million tonnes per year, and St-Brieuc would be accessible to heavier-tonnage coasters and would then follow the current growth of...
Tipo: Text
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/rapport-2835.pdf

Pisciculture marine et environnement en France: specificite par rapport a l'eau douce
Provedor de dados: 5
Autores: Kempf, Marc; Merceron, Michel; Dosdat, Antoine.
French marine fish farming deals with several species: sea bass, sea bream, turbot, trout and salmon. In 1992, 20 M fingerlings and 2600 t of fish were produced, for a turnover of 165 MFF: This very technical activity is developing, but still fragile and risky. Environment protection regulation applied to marine fish farming directly inspires from that in force in fresh water, which comes from the industry: i.e. the so-called "classified installation" regulation, concerning activities likely to produce polluting effluents. It does not really adapt to diluted effluents, like fish growing ones, and still less to marine farming; this is true for parameters like biological oxygen demand (BOD) and chemical oxygen demand (COB) and, to a lesser extent, for...
Tipo: Text
Palavras-chave: MED; France ANE; France Suspended particulate matter Legislation Production management Environmental protection Fish culture.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/acte-1331.pdf

Biomasses d'ulves et flux de nutriments en baie de Douarnenez
Provedor de dados: 5
Autores: Merceron, Michel; Coic, Daniel; Talec, Pascal.
In spring and summer time, green tides outbreaks yearly occur on sandy beaches of the central and southern parts of the bay of Douarnenez. During four years the nitrate loadings of incoming streams were measured during the growth season of the green algae. Every summer the stock of stranded algae as well as those in the very shallow water were quantified. Three streams from the eight investigated provide the most important part of nitrogen loadings. These ones tend to diminish in the course of spring and summer. They are very different from year to year. The observed biomass of algae is also very different according to years (from 120 to 3 400 t), and even from day to day according to the wind direction. However, the southern part of the bay is more...
Tipo: Text
Palavras-chave: Brittany Bay of Douarnenez Eutrophication Nitrate Ulva Green tide Bretagne Baie de Douarnenez; Eutrophisation Nitrate Ulve Marée verte.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-63.pdf

Mortalites de poissons en baie de Vilaine (Juillet 1982) Causes - Mécanismes - Propositions d'action
Provedor de dados: 5
Autores: Merceron, Michel.
The massive number of fish mortalities that occurred in July of 1982 in Vilaine Bay is due to a very pronounced oxygen depletion in the bay's bottom waters. This loss was caused by the chronic fragility of this area, associated with an abnormal weather pattern. The endemism of partial oxygen depletion has been brought to light. The latter could be economically more significant than the anoxia of 1982. Preventative and warning actions have been proposed.
Tipo: Text
Palavras-chave: Brittany; Dam; Estuary; Meteorological factors; Stratification; Phytoplankton; Oxygen depletion; Coastal waters; Fish kill; Estuaire; Facteurs météorologiques; Stratification; Prolifération planctonique; Déficit en oxygène; Eaux côtières; Mortalité de poisson.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/rapport-2836.pdf

Abattement de l'azote par le marais côtier de Kervigen et potentiel breton
Provedor de dados: 5
Autores: Piriou, Jean-yves; Coic, Daniel; Merceron, Michel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered by reeds. An experiment was there carried out to assess the nitrogen flux depletion of a small stream, the Kerharo. That one has a 45 km 2 mostly agricultural drainage basin. Due to its nitrate loadings to the next sandy beach, it feeds a green algae (Ulva) proliferation. In order to control its nitrogen fluxes, the stream was partly diverted through a part of the marsh (9 ha), before it was allowed to go back to the main bed. Thus a collapsible weir was set up during several springs and summers, i.e. the growing period of Ulva. The nitrate stripping off the going through flux is within a 30 to 90 % range,that is important (175 kg N03...
Tipo: Text
Palavras-chave: Algae; Nitrogen; Ulva; Nitrate depletion; Costal marsh; Algue; Azote; Ulva; Abattement de nitrate; Marais côtier.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-64.pdf

La moule en aquaculture - Réalités et perspectives
Provedor de dados: 5
Autores: Merceron, Michel.
En agriculture, le passage de l'élevage traditionnel à l'élevage dit industriel a été rendu possible, entre autres éléments, par la disponibilité régulière d'un aliment de qualité suffisante et bon marché. Pour son développement, l'aquaculture des animaux carnivores requérira également la disponibilité d'un aliment présentant les mêmes avantages. Il ne servirait de rien de produire de fortes quantités de stades juveniles en écloserie si nous n'étions pas aptes à assurer leur croissance ultérieure dans des conditions économiquement satisfaisantes. Il n'est donc pas prématuré de se pencher sur ce qui pourra être le ou les aliments qui répondront à cette exigence. Nous limiterons évidemment cette étude au cadre des régions tempérées et nous laisserons de...
Tipo: Text
Ano: 1974
URL: http://archimer.ifremer.fr/doc/00151/26193/24212.pdf

Température et salinité dans l'Aber Benoît et l'Aber Wrach été 1991, rapport de mesures
Provedor de dados: 5
Autores: Merceron, Michel; Gaffet, Jean-dominique.
This report displays the data of temperature and salinity from the records performed in the Aber Wrach and Aber Benoît estuaries during the summer 1991. This work was decided after a massive oyster kill in the Aber Benoît estuary.
Tipo: Text
Palavras-chave: Brittany; Estuary; Salinity; Temperature; Bretagne; Estuaire; Salinité; Température.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/rapport-2659.pdf

Pollutions diffuses : du bassin versant au littoral - Synthèse scientifique
Provedor de dados: 5
Autores: Merceron, Michel.
The main results presented in this symposium are summarised in this document by type of contaminant: - Nitrogen - Phosphorus - Pesticides - Bacteria
Tipo: Text
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/acte-2664.pdf

L'aquaculture francaise en bref
Provedor de dados: 5
Autores: Dosdat, Antoine; Kempf, Marc; Merceron, Michel; Paquotte, Philippe.
Aquaculture in France is characterised by great species diversity. Furthermore, traditional activities (farming of marine shellfish and freshwater fish) coexist with still-developing recent ones (marine fish farming, new pratices in shellfish rearing, etc.). Traditional cultures are the main contributors to the tonnage produced and employment generated. Another noticeable point is the importance of the western part of the country, which carries the main part of the production (&gt; 80 %): the Channel Atlantic coast for shellfish, and nearby rivers for freshwater salmonid farming. On the Mediterranean coast, marine fish farming of bass and bream, as well as shellfish production by new methods (mussels on longlines in open waters), are developing. Important...
Tipo: Text
Palavras-chave: MED; France ANE; France France Environmental protection Coastal zone Species diversity Aquaculture.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/acte-1326.pdf

Complement méthodologique à l'étude d'impact du Légué (Saint Brieuc)
Provedor de dados: 5
Autores: Merceron, Michel.
The project to enlarge the port of Le Légué at St-Brieuc required conducting an environmental impact study. This took place in 1980 and 1981 (Merceron et al). In view of the project's importance and the almost complete absence of baseline ecological studies of this area, it has been necessary to proceed with a rather extensive investigation. In this way, the field studies focused on the following aspects: hydrobiology, benthos, contaminants in the water, the sediment and living matter, Yffiniac marsh, flat fish nurseries. Overall, the impact of the Le Légué port enlargement on the marine environment of the bottom of St-Brieuc's bay seemed to be relatively minor. However a qualification was made concerning the modes of discharge of the planned basin's...
Tipo: Text
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/rapport-2842.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 2. étude biosédimentaire
Provedor de dados: 5
Autores: Kempf, Marc; Cadour, Gwenael; Jeanneret, Hélène; Mear, Yan; Miramand, Pierre; Merceron, Michel.
This document is a result of an environmental impact study carried out between 1993 and 1995 on the site of a marine trout culture located in the Harbour of Cherbourg, France. It deals with the solid waste of the farm and concems deposition rate, sediment analysis and chemistry (fine fraction &lt; 63 ~m, organic matter, carbon, nitrogen, copper and zinc), bottom living organisms and underwater video monitoring. The impact observed is very moderate and localised. This is mainly due to the strong d)'TIamics and flushing rate of the site. A seperate volume of the same study deals with dissolved waste and concems the water mass (volume 1 : water and pelagos). (Not controlled OCR)
Tipo: Text
Palavras-chave: Rade de Cherbourg; Étude biosédimentaire; Impact; Salmoniculture marine; France; Cherbourg; Benthos; Sediment; Environmental impact; Trout; Marine fish farming.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3349.pdf

Mortalités de poissons d'élevage par phytoplancton toxique Camaret (Finistère), automne 1994
Provedor de dados: 5
Autores: Kempf, Marc; Merceron, Michel; Nezan, Elisabeth.
Brown water was observed in Camaret Cove, on 27 and 28 September 1994, because of the massive proliferation of a toxic phytoplankton alga. The densities reached by this alga were considerable: from 1.5 million cells per litre at a point far from the coast to 130 million cells per litre at the height of the efflorescence at the bottom of the bay, in the port's waters. The toxicity of this alga caused deaths in the farms of salmonids in cages set up at this site. The SEMII (IFREMERINRA research facility) experimental farm recorded 100% losses (15-20% on 27 September and the entire remaining stock during the night of 27-28 September), which is around 10 tonnes of fario trout and 0.5 tonne of Atlantic salmon. Aside from the economic loss, this represents a...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/publication-2831.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 1. Eau et Pélagos
Provedor de dados: 5
Autores: Merceron, Michel; Bentley, Daniel; Le Grand, Jacqueline; Lamort-datin, Laure; Kempf, Marc.
The environmental impact of a brown trout farm located in the Grande Rade de Cherbourg (Normandy) is reported. During observations the fish stock evolved within the range of 140 to 350 metric tons. Farm influence was researched on water column through hydrochemistry, phytoplankton, faecal bacteria and, on bottom, through grain size, organic matter, metals, macrobenthos. This report only deals with water column.  Except ammonia, no hydrological parameter seems to be affected, even near to the net pens. Phytoplankton and coliform bacteria were not altered. An extra concentration of ammonia was detected at some tens meters from the raft, with favourable conditions. But generally it was impossible to observe it unless close to the farming structure, downward...
Tipo: Text
Palavras-chave: Channel; Current; Faecal bacteria; Phytoplankton; Hydrology; Impact; Salmonid; Fish farm; Manche; Courant; Bactéries fécales; Phytoplancton; Hydrologie; Impact; Salmonidé; Aquaculture.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3342.pdf

Inventaire des sites potentiels pour l'aquaculture sur le littoral des Cotes-du Nord : fascicule 1: aquaculture nouvelle
Provedor de dados: 5
Autores: Couteaux, B; Jegou, Anne-marie; Merceron, Michel; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Côtes-du-Nord shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, in Finistère, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities -the need to set aside suitable sites for the development of aquafarming.  In order to make consistent development choices, it is important to know as well as possible the aquafarming potential sites that we have available, their size, their nature, their geographic distribution, as well as the state of the techniques to be implemented.  In Brittany itself, a quick...
Tipo: Text
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/rapport-2660.pdf

Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère : première phase (Etude bibliographique et reconnaissance terrain) Fascicule 1 : Aquaculture nouvelle
Provedor de dados: 5
Autores: Merceron, Michel; Jegou, Anne-marie; Couteaux, Bertrand; Piriou, Jean-yves.
Producing the Inventory of Potential Sites for Aquaculture along the Finistère Shoreline was decided by the Département's Regional Council with the goal of integrating aquafarming in the best way possible into the variety of businesses that are based along the coastal zone. Aquafarming, in order for it to exist tomorrow, needs to be taken into account today as far as preservation of sites, and this must be done with two aspects in mind:  - land, on shore; - water quality (which implies maritime and land constraints).  In this context, the Regional Council has entrusted the Centre National pour l'Exploitation des Océans with a study that will make it possible to define the aquafarming potential of the Finistère shoreline.  It was decided to split this study...
Tipo: Text
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/rapport-2655.pdf

Sites naturels possibles pour l'aquaculture sur le littoral du Finistère
Provedor de dados: 5
Autores: Merceron, Michel.
Tipo: Text
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/rapport-2657.pdf

Suivi de flotteurs dans la zone Loire Vilaine
Provedor de dados: 5
Autores: Kerdreux, Michel; Merceron, Michel; Le Hir, Pierre; Breton, Marguerite.
During one month in summer of 1985 the courses of ten drifters, dropped at the mouth of Loire and Vilaine Rivers, were monitored. Results show:  -the marked influence of wind on the movement of this region's bodies of water, -the possibility of an intrusion of the Loire's waters in Vilaine Bay, -the very likely absence of any influence of the Loire's waters in the bottom waters' anoxia that occurred in Vilaine Bay during the summer of 1982.
Tipo: Text
Palavras-chave: Anoxia; Vilaine; Currents; Drifters; Anoxie; Vilaine; Loire; Courants; Flotteurs.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/rapport-2653.pdf

Inventaire des sites potentiels pour l'aquaculture sur. le littoral du Finistère : fascicule 1 : aquaculture nouvelle
Provedor de dados: 5
Autores: Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Finistère shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities, -the need to set aside suitable sites along the shoreline for the development of aquafarming.  In order to make consistent growth choices, it is important to know as well as possible the aquafarming potential that we have available, their size, their nature, their geographic distribution, as well as the degree of maturity of the techniques to be implemented.  In Brittany itself, a quick...
Tipo: Text
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/rapport-2661.pdf

Des poissons médusés
Provedor de dados: 5
Autores: Merceron, Michel; Le Fevre-lehoerff, Geneviève; Bizouarn, Yvon; Kempf, Marc.
After the efflorescence of toxic phytoplankton that affected them in the month of September 94 (see our March 95 issue), the Camaret salmonid farms were confronted with a proliferation of stinging jellyfish at the end of the month of November (photo 1). In January 95, it is in Douarnenez Bay that trout are affected by the same phenomenon...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/publication-2832.pdf

Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère. 2ème phase : Aquaculture nouvelle, fichier
Provedor de dados: 5
Autores: Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
Tipo: Text
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/rapport-2663.pdf

Macroalgal population and sustainability
Provedor de dados: 5
Autores: Morand, Philippe; Merceron, Michel.
Algal blooms, often associated with eutrophication, are common in temperate regions in coastal lagoons and estuarine areas as well as in open seas. However, because of recent changes in water flows and sediment and nutrient loads in most rivers, eutrophication phenomena are now occurring in areas previously non affected. One of its most widespread and easily recognized effects in a coastal marine ecosystem is the excessive growths and drifts of macroalgae, to such a degree that the biomass becomes a significant problem.   The nutrients, notably from anthropogenic origin, constitute a significant factor in the appearance of the blooms in coastal waters. Besides a background originating from natural areas and precipitations, nutrients come from agriculture,...
Tipo: Text
Palavras-chave: Green tides; Macroalgae; Eutrophication; Nutrients; Black Sea.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2131.pdf

Seawater quality and summer mortalities of Atlantic salmon farmed in France
Provedor de dados: 5
Autores: Merceron, Michel.
(Not controlled OCR) Every summer, since 1983, important mortalities of Atlantic salmon smolts occur in net pen farmings in Brittany (France) (Harache and Gaignon, 1986). These mortalities, ranging from 30 to 87 % of stock, are in the way of the economic development of this activity. They take place between mid-June and the end of July. Most of the smolts are sluggish and without appetite. Looking for a viral or bacterial aetiology by the veterinary services was often unfruitful. In order to investigate a possible role of environment, a set of parameters was monitored and compared in two farming sites displaying very different mortality rates.
Tipo: Text
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-2648.pdf

Inventaire des sites possibles pour l'aquaculture sur le littoral du Morbihan - Tome 2
Provedor de dados: 5
Autores: Fleury, Pierre-gildas; Merceron, Michel.
File of selected sites Sector 1 – Lorient region Sector 2 – Etel River Sector 3 – Auray - Quiberon
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/rapport-2838.pdf

Présentation des bassins versants ateliers (Coët-Dan et Kerharo) et de la baie de Douarnenez
Provedor de dados: 5
Autores: Bordenave, Paul; Merceron, Michel.
The transmission of several contaminants from agricultural land to the shoreline has been studied within the scope of this programme, both by general research and by field investigations. The field investigations took place in two test catchment areas (fig. 1). One of them, Coët-Dan, has been fitted out with various measuring devices since the year 1971 and has been monitored since that date. The other one, Kerharo, has never been studied until now. The research topics were distributed between these two catchment areas in the following way. At Coët-Dan, what was handled were the transfer of pesticides and bacteria of sanitary interest, the nitrogen and phosphorus supplied to the fields by farms, the transfer of these nutrients into the surface horizons and...
Tipo: Text
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/acte-2841.pdf

Motivations et présentation du programme « Bassins versants et transmission des pollutions au littoral »
Provedor de dados: 5
Autores: Merceron, Michel; Le Bozec, Gildas.
As for its physical layout, Brittany is characterised by a very dense water system, catchment areas that are mostly of small size (a few dozen square kilometres) and a very significant line of coasts with regard to its surface area. These environments, very close and interdependent, are rich with life, and yet have been affected for many years by dramatic incidents of contamination: the proliferation of marine green algae and the degradation of the quality of the surface fresh waters are the most visible manifestation of this. Among the incidents of contamination that affect these environments—many of them are brought mainly and crucially by continental waters—are those originating from agriculture.  Over the last 30 years, Brittany has experienced very...
Tipo: Text
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/acte-2840.pdf

L'économie de la mer en Normandie
Provedor de dados: 5
Autores: Merceron, Michel.
Le littoral de Normandie présente un contraste entre l'ensemble diversifié de ses côtes et le complexe portuaire d'échelle européenne de la Basse-Seine, dominé par le port du Havre, port en eau profonde le plus avancé de l'Europe du Nord, étendu à l'avenir par le terminal d'Antifer, appuyé sur une vaste zone industrielle et un riche hinterland relié à la région parisienne. Il en résulte, en Normandie, sur le plan économique, un développement exceptionnel des activités industrielles et tertiaires à caractère maritime, alors que les autres ressources liées à la mer, telles que les activités primaires et le tourisme, y appar~issent relativement faibles. Ce contraste se situe géographiquement entre la Haute-Normandie, puissante région à vocation industrielle,...
Tipo: Text
Ano: 1974
URL: http://archimer.ifremer.fr/doc/00069/18012/15539.pdf