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A model for the phenotypic plasticity of North sea herring growth in relation to trophic conditions ArchiMer
Shinn, Yunne-jai; Rochet, Marie-joelle.
An adaptation of the von Bertalanffy growth model is formulated to describe the phenotypic plasticity of fish somatic growth in relation to trophic conditions. The model is developed for the North sea Downs herring (Clupea harengus). II suggests that annual growth variability during 1974-1990 was mainly due to the combined effects of herring abundance and wind-induced turbulence (coincident with the spring stratification of the water column). Springtime turbulences cause reduced and delayed planktonic blooms preceding the annual foraging period of Downs herring. The negative relation observed between herring abundance and growth is hypothesized to be due to intra-specific competition for trophic resources. Incorporated into the calculation of yield per...
Tipo: Text Palavras-chave: Modèle de croissance; Densité-dépendance; Plasticité phénotypique; Clupea harengus; Hareng de mer du Nord; Gestion des pêches; Growth model; Density dependence; Phenotypic plasticity; Fishery management; Clupea harengus; North sea herring.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00188/29878/28358.pdf
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Modélisation biophysique pour la prévision du recrutement ArchiMer
Allain, Gwenhael.
Exploited fish populations are dependent on recruitment (i.e. size of the new year class) to sustain their abundance. Recruitment variations are related to hydroclimatic variations and may accentuate the detrimental effects of fishing. Recruitment prediction requires accurate fisheries oceanographic tools, which are expected to be more reliable than large-scale correlation analyses between fish abundance and climate variables. Recruitment is the result of the integration over a season and large oceanic areas of processes affecting larval survival, which are dependent on small-scale mechanisms. Hydrodynamic models are a tool to perform this integration. This thesis aims at exploring and modelling physical-biological interaction mechanisms in order to...
Tipo: Text Palavras-chave: Anchovy; Upwelling; Turbulence; Retention; Fisheries management; Population dynamics; Stock environment interaction; Stock recruitment relation; Scale integration; Individual based models; Survival; Growth; Otolith; Physical biological interactions; Prediction; Recruitment; Turbulence; Rétention; Méso échelle; Intégration des échelles; Modèle de survie; Modèle de ponte; Modèles individu centrés; Modèles de corrélation; Modèles stochastiques; Juvéniles; Larves; Otolithe; Modèle de croissance; Interactions physique biologie; Prévision; Recrutement.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-5.pdf
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Modélisation de l'écosystème du bassin de Marennes-Oléron (Rapport 1991) ArchiMer
Raillard, Olivier; Razet, Daniel; Prou, Jean; Heral, Maurice.
Les expérimentations en continu sur le site du Chapus au centre du bassin de Marennes-Oléron pendant le mois de mai 1990 ont permis de déterminer le comportement des huîtres (filtration et ingestion). Dans le bassin de Marennes-Oléron les huîtres sont toujours au-dessus du seuil de production de pseudofeces qui régulent la qualité de nourriture ingérée. Ces résultats démontrent par ailleurs qu'il existe nettement un tri du matériel particulaire en suspension. Les huîtres rejettent préférentiellement le matériel minéral dans les pseudofeces alors que le matériel qui transite dans le tractus digestif est enrichi en matière organique. Un modèle trophique des huîtres a ainsi pu être établi avec de nouvelles lois de tri de la matière particulaire. Parallèlement...
Tipo: Text Palavras-chave: Séries en continu; Turbidité; Phytoplancton; Physiologie huître Crassostrea gigas; Modèle de croissance; Modèle de remise en suspension.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00095/20635/18266.pdf
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Performances de croissance de l'huître creuse, Crassostrea gigas (Thunberg) dans le bassin d'élevage de Marennes-Oléron entre 1979 & 1982 ArchiMer
Berthome, Jean-paul; Prou, Jean; Bodoy, Alain.
Growth of the japanese oyster, Crassostrea gigas was monitored during 4 years, by following the recruitment of the year 1978, held in rearing conditions. After three and half years, the average length was la cm and the average total weight was 80 g. Clear seasonal changes were observed on the growth in length and weight. An important loss in dry weight occured in July, during the release of gametes. Such losses constituted 29 %, 43 % and 60 % of the dry weight, respectively for individuals which were 2 years, 3 years and 4 years old. The higher instantaneous growth rates (G) were observed during spring and at the beginning of summer. Growth model of Von Bertalanffy, gave the best estimate for the length growth of the species. During the 1979-1982...
Tipo: Text Palavras-chave: Growth parameter; Growth model; Reardd stock; Crassostrea gigas; Oyster; Growth; Descripteurs de croissance; Modèle de croissance; Stock cultivé; Crassostrea gigas; Huître; Croissance.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/publication-2967.pdf
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