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Registros recuperados: 10
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie crevettière : expériences de chalut sélectif en baie de Vilaine, première partie ArchiMer
Dupouy, Herve; Vacherot, Jean-philippe; Meillat, Marc.
The French brown shrimp (Crangon crangon) fishery employs on a seasonal basis around 140 ships about 10 metres in length and with engines of about 100 kilowatts of power. It takes place mainly along the coastal bottoms of silted-up sand at a depth of 2 to 10 metres and occupies principally the coasts of the eastern English Channel and those of the Gulf of Gascony. The brown shrimp catch is performed by bottom trawl, with exempted meshing of 20 mm (stretched mesh), which causes numerous rejects of immature fish that live on the same bottoms. The main part of these juveniles is made up of flat fish (sole, in particular) and of gadidae (whiting and pout). To reduce these undesirable catches that are also detrimental to other fisheries, some ingenious...
Tipo: Text Palavras-chave: Selective trawl; Devisme trawl; Asselin trawl; Brittany; Bay of Vilaine; Gadides; Sole; Whiting; Pout; Juvenile; Chalut devisme; Chalut Asselin; Chalut sélectif; Baie de Vilaine; Gadidés; Soles; Merlan; Tacaud; Juvéniles.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-2669.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie de crevette grise, Deuxième partie ArchiMer
Vacherot, Jean-philippe; Dupouy, Herve; Meillat, Marc.
Starting from the year 2000, the European Union planned to establish the use of a selective trawl in brown shrimp (Crangon crangon) fisheries. In fact, the brown shrimp is caught by a bottom trawl equipped with stretched 20 mm exempted meshing in estuary areas where the nurseries of flat fish and gadidae are located. For Vilaine's estuary, Dupouy et al (1997) estimated at about 1 tonne of flat fish and one tonne of gadidae the loss in equivalent fish of marketable size, per landed tonne of brown shrimp. In this document, the authors introduce improvements resulting from the use of selective trawls developed in France (Asselin and Devismes trawls), and they show by what means the selectivity of these trawls can be improved further.
Tipo: Text Palavras-chave: Bay of Vilaine; Common shrimp; Selective trawl; Whiting; Pout; Gadides; Soles; Juveniles; Baie de Vilaine; Crevette grise; Chalut sélectif; Merlan; Tacaud; Gadidés; Soles; Juvéniles.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/rapport-2670.pdf
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Comparaison des performances d'élevage de moules en 4 sites mytilicoles de la baie de Vilaine, de février 2000 à février 2001 ArchiMer
Mazurie, Joseph; Bouget, Jean-francois; Claude, Serge; Fleury, Pierre-gildas; Langlade, Aime.
Mussel samples have been placed in plastic-mesh bags hung on wood poles (« bouchots »), at 4 locations of a mussel culture area in the bay of Vilaine (South Brittany, France). They have been monitored for one year, from February 2000 to February 2001. The recorded growth have been rather fast (plus 1.2 g per month between April and September), and mortalities moderate (between 15% to 25%), with better results in southern stations, further from the estuary. Among the physico-chemical parameters recorded, the most striking were very low salinities (below 10 g/l) recorded for days, after heavy rains. They provoqued a valve closure of mussels (recorded by a « valvometer »). Some physiological indicators being tested (muscle force and hermeticity) seemed to...
Tipo: Text Palavras-chave: Valve movements; Hermeticity; Muscle strength; Mortality; Growth; South Brittany; Bay of Vilaine; Mytilus edulis; Mussel; Écartements valvaires; Herméticité; Force musculaire; Mortalité; Croissance; Bretagne sud; Baie de Vilaine; Mytilus edulis; Moule.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-6373.pdf
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Etude des kystes de dinoflagelles en Baie de Vilaine. I - Synthèse bibliographique ArchiMer
Larrazabal, Maria Eduarda.
The study of modern marine dinoflagellate cysts is especially attractive when considering toxic or red tide species. In the case of Vilaine Bay (South Brittany - France) the evolution of bottom marine sediments between 1965 and 1985 (increase of muddy areas) as weIl as summer blooms of Prorocentrum, Protoperidinium and Gonyaulax gave arguments for credit to the existence of cysts corresponding to that generas. After a brief analyse of recent litterature first results of 1986 sampling operation confirm initial hypothesis.
Tipo: Text Palavras-chave: Dinoflagelles; Kystes; Baie de Vilaine; Dinoflagellates; Cysts; Vilaine bay.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00138/24908/23001.pdf
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Evaluation du potentiel nutritif des eaux de la baie de Vilaine pendant l'été 1987 ArchiMer
Le Dean, Loic; Truquet, Philippe; Lassus, Patrick.
The growth potential study of waters of the Vilaine bay was realized from march to september 1987 and for three sampling stations. The growth of depleted test cells of Skeletonema costatum was estimated and compared from existing nutrients pools for aIl water samples. As a first result it appears that inorganic nitrogen could stimulate the growth during spring while no clear relationship is observed between the algal growth and other hydrological parameters during spring or summer periods. Nevertheless these first results need further corroboration.
Tipo: Text Palavras-chave: Potentiel nutritif; Baie de Vilaine; Skeletonema costatum; Test biologique; Growth potential; Vilaine Bay; S. costatum; Bioassay.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00139/25037/23146.pdf
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Evolution du peuplement halieutique de la baie de Vilaine au cours des décennies 1980 et 1990 ArchiMer
Desaunay, Yves; Guerault, Daniel.
A beam trawl survey of the Bay of Vilaine was conducted from 1981 to 1997. Changes in the commercial fish community were analyzed by comparing the characteristics at the year and decadal scales. The community structure and nursery function of the Bay were steady during the period. However, specific richness, assiduity and distribution indices demonstrated a reduction in the second decade. The global abundance fell from 105.8 ind.ha-1 to 31.3 ind.ha-1. This trend was less marked for the external more marine stratum, which exhibited the lowest densities. The results are discussed in terms of ecological meaning of such a community, compared with the overall demersal fish community. The reasons of the decrease are questioned regarding nursery habitat, local...
Tipo: Text Palavras-chave: Habitat; Survey; Bay of Vilaine; Fish community; Habitat; Suivi; Baie de Vilaine; Poissons; Peuplement.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-1288.pdf
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Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine de février à octobre 2016 ArchiMer
Retho, Michael.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2016 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Cette station est équipée d’une sonde multiparamètre qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à deux niveaux (surface et fond) avec une fréquence d’une mesure horaire. Ce rapport synthétise les...
Tipo: Text Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00384/49565/50056.pdf
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Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine entre février et octobre 2017 ArchiMer
Retho, Michael.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2017 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Elle fait également partie du réseau COAST-HF (Coastal OceAn observing SysTem – High Frequency). Cette station est équipée d’une sonde multiparamètres qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à...
Tipo: Text Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00441/55218/56693.pdf
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Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine entre mars et octobre 2015 ArchiMer
Retho, Michael; Gabellec, Raoul.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2015 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Cette station est équipée d’une sonde multiparamètre qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à deux niveaux (surface et fond) avec une fréquence d’une mesure horaire. Ce rapport synthétise les...
Tipo: Text Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00335/44596/44324.pdf
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Rôle des sédiments dans le cycle des nutriments et impacts sur l’eutrophisation des écosystèmes côtiers ArchiMer
Ratmaya, Widya.
Eutrophication was studied in the coastal waters of Vilaine Bay (VB) in relation to that in the Loire and Vilaine rivers, by analyzing long-term trends of phytoplankton biomass and nutrient concentrations during the past decades. The reduction in dissolved riverine inorganic phosphorus concentrations (DIP) during the last two decades led to the significant decrease in chlorophyll a concentrations. However, dissolved inorganic nitrogen concentrations (DIN) decreased only slightly in the Vilaine and actually increased in the Loire, especially during summer. Simultaneously, phytoplankton in VB has undergone the following changes: 1) increase in biomass, 2) change in timing of the annual peak of biomass from spring to summer, 3) modification in seasonal course...
Tipo: Text Palavras-chave: Eutrophisation; Cycle des nutriments; Régénération benthique; Nutriment limitant; Baie de Vilaine; Eutrophication; Nutrient cycling; Benthic regeneration; Nutrient limitation; Vilaine Bay.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00476/58799/61337.pdf
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