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Registros recuperados: 4
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Etude bio-économique de l'exploitation des ressources sous diverses hypothèses de gestion ArchiMer
Biseau, Alain; Ould El Kettab, Mustapha.
The model developed is a multi-species, multi-fleet and multi-sector model that consists of a dynamic allocation of the fishing effort. It can therefore measure the amplitude of the effort's generated outputs by strict, implemented and honoured regulatory measures. The management measures likely to be simulated give an account of the main trends of the regulations in effect in Community waters. Their effects on both the resource and the fleets are evaluated. Each stock, confined or not to a sector, has its own dynamic described by a model structured by ages: recruitment is assumed to be constant. Biological interactions (intra- and inter-species contact) as well as the problems of exchanges between sectors are not taken into account. In order to treat the...
Tipo: Text Palavras-chave: Dynamique des stocks; Eaux communautaires; Recrutement; Activité des flottilles; Mesures reglementaires; Gestion de la ressource; Modèle biologique.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-2578.pdf
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Modélisation de la production ostréicole à Marennes-Oléron : introduction d'un modèle de croissance phytoplanctonique ArchiMer
Raillard, Olivier.
La complication d'un modèle déterministe est une action qui ne peut être envisagée sans raisons impérieuses. En plus des mécanismes nouveaux qu'il importe de connaître précisément pour les formaliser correctement, l'introduction de nouveaux paramètres, dont la valeur exacte n'est jamais connue, accroit l'incertitude du modèle (Klepper et Scholten, 1988) et affecte ainsi sa robustesse (Swartzman et Kaluzny, 1987). A Marennes-Oléron, l'introduction d'un modèle de production primaire doit permettre d'aborder les problèmes suivants : Quelle est véritablement l'impact des débits de la Charente sur la production ostréicole? ou plus précisément : les nutriments d'origine charentaise contrôlent-ils la production phytoplanctonique du bassin et par voie de...
Tipo: Text Palavras-chave: Modélisation; Croissance; Phytoplancton; Modèle biologique; Bassin de Marennes Oléron; Charente Maritime.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00102/21313/18932.pdf
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Relation entre la capacité trophique de l'écosystème "claire ostréicole" et la production de l'huître Crassostrea gigas en période d'affinage ArchiMer
Soletchnik, Patrick; Razet, Daniel; Goulletquer, Philippe; Geairon, Philippe; Le Moine, Olivier; Faury, Nicole.
This study presents an environmental survey o foyster ponds in Marennes Oléron Bay (France). Physical and biological parameters were recorded in continuous to study this mesocosm (450 m2 surface). The trophic capacity of the water column was assessed and used as an imput signal in the biological model of Crassostrea gigas. Oyster production in earthen-ponds was compared to the biological model results. Simulation was carried out experimental results to investigate temperature and food effect on energetic budget of Crassostrea gigas during summer and winter
Tipo: Text Palavras-chave: Mesocosm study; Crassostrea gigas; Pond; Oyster rearing; Modèle biologique; Ressource trophique; Affinage; Claires ostréicoles; Crassostrea gigas; Huître.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/acte-3236.pdf
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Seuil de production de pseudo-fécès de l'huître creuse du Pacifique : Crassostrea gigas (Thunberg) dans des conditions de faibles charges particulaires ArchiMer
Soletchnik, Patrick; Goulletquer, Philippe; Geairon, Philippe; Razet, Daniel.
This study is part of a comprehensive research program focusing on the oyster shellfish management in the Marennes-Oleron Bay: Within this program, a task aimed to develop a biological model of the Pacific cupped oyster Crassostrea gigas. Our study addressed the issue of pseudo-faeces production threshold under various diet quality levels. Pseudo-faeces sampling was carried out using particulate matter concentration below Il mg 1-1 The various modalities prompted us to define two pseudo-faeces production models. The first model was developed using natural seawater. The organic matter ratio ranged from 25 to 45% while the pseudo-faeces production threshold reached 2.9 to 4.4 mg 1-1 of total particulate matter. The second model was established using seawater...
Tipo: Text Palavras-chave: Marennes Oleron; Pseudo faeces; Crassostrea gigas; Oysters; Biological model; Marennes Oléron; Pseudo fécès; Crassostrea gigas; Huîtres; Modèle biologique.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/publication-3087.pdf
Registros recuperados: 4
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