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Registros recuperados: 92
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A comparison of condition factor and gonadosomatic index of sardine Sardinops sagax stocks in the northern and southern Benguela upwelling ecosystems, 1984-1999 IRD
Kreiner, A.; Van der Linger, C.D.; Fréon, Pierre.
Tipo: Text Palavras-chave: SARDINE; STOCK; BIOMASSE; DENSITE DE POPULATION; BIOMETRIE; PHYSIOLOGIE; MATURITE SEXUELLE; VARIATION SAISONNIERE; VARIATION INTERANNUELLE; ETUDE COMPARATIVE.
Ano: 2001 URL: http://www.documentation.ird.fr/hor/fdi:010029972
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A methodology for in situ measurement of mean target strength in small schools IRD
Fréon, Pierre; Gerlotto, François.
Tipo: Text Palavras-chave: POISSON; PROSPECTION ACOUSTIQUE; BANC.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:26667
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A methodology for visual estimation of abundance applied to flyingfish stocks IRD
Fréon, Pierre.
Une méthode d'estimation de l'abondance des stocks de poissons volants est proposée. Elle est basée sur des comptages, regroupés par intervalles de distance réguliers, de poissons s'envolant à l'approche d'un bateau de recherche effectuant des radiales prédéterminées. En cela la méthode s'apparente aux évaluations de stock par écho-intégration. Durant les campagnes, on collectera diverses variables (biologiques, physiques et climatiques) pouvant influencer directement ou indirectement les estimations d'abondance ou la répartition de la ressource. La méthodologie d'observation (directe et avec caméra) et d'analyse des données est décrite, ainsi que l'équipement nécessaire afin de saisir directement sur support informatique un maximum de données. (Résumé...
Tipo: Text Palavras-chave: ESTIMATION DE STOCK; METHODOLOGIE; POISSON VOLANT; OBSERVATION VISUELLE.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:26619
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Analysis of vessel influence on spatial behaviour of fish schools using a multi-beam sonar and consequences for biomass estimates by echo-sounder IRD
Soria, Marc; Fréon, Pierre; Gerlotto, François.
Biases in the measurements of spatial distribution of fish schools and their consequences for school biomass estimates during conventional acoustic surveys are mainly due to vertical and lateral avoidance of the vessel. In this paper, we quantify school avoidance during an acoustic survey carried out from 10 to 29 May 1994 in the Catalan Sea. From a lateral multi-beam sonar the geometric characteristics (depth, length, width, height, surface, and volume) of 1268 schools were obtained. The 60 beams (1.5° X 15°) of the sonar scanned a vertical plane from 0° to 90°, perpendicular to the vessel path within a range of 100 m. Within this plane, the projected area ensonified by the echo-sounder used aboard for acoustic evaluation was evaluated to simulate a...
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; DISTRIBUTION SPATIALE; ESTIMATION DE STOCK; SONAR; BANC DE POISSONS.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010008040
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Artisanal fisheries of Eastern Venezuela : evaluation of potential fishing effort (1981-1983) IRD
Iriarte, L.M.; Fréon, Pierre; Rodriguez, A.; Gonzalez, A.; Gerlotto, François; Mendoza, J..
Tipo: Text Palavras-chave: PECHE ARTISANALE; ESTIMATION DE STOCK; METHODOLOGIE; EFFORT DE PECHE; ENQUETE.
Ano: 1984 URL: http://www.documentation.ird.fr/hor/fdi:34305
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Body length variability in fish schools and cohorts : application to fisheries biology in tropical waters IRD
Fréon, Pierre.
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; DYNAMIQUE DE POPULATION; BANC.
Ano: 1983 URL: http://www.documentation.ird.fr/hor/fdi:31697
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Causes and effects of terrestrial runoff and riverine outflow on brackish/coastal marine fisheries ecosystems in the northern mediterranean region IRD
Crivelli, A.J.; Ximenes, M.C.; Gout, B.; Lasserre, G.; Fréon, Pierre; Do Chi, T..
Tipo: Text Palavras-chave: ECOSYSTEME; ZONE COTIERE; BIOTOPE; POISSON MARIN; ESTUAIRE; EAU DOUCE; CAPTURE; POLLUTION.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010008046
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Changes in school structure according to external stimuli : description and influence on acoustic assessment IRD
Fréon, Pierre; Gerlotto, François; Soria, Marc.
The study of the internal school structure and behaviour of pelagic fish provides interesting information in relation to acoustic surveys, especially when comparing the undisturbed structure with the structure observed beneath a vessel passing over a school. The methodological approach involves in situ observations and combines acoustic and visual (aerial and underwater) techniques. The internal school structure is heterogeneous, including vacuoles, and this structure changes when the school is overpassed by a vessel during the day. In this case compression of the upper layer of the school is observed. The influence of this school structure on the variability of the density estimation has been studied. For the subsurface schools, the usual rate of sampling...
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; ETHOLOGIE; PREDATION; PROSPECTION ACOUSTIQUE; BANC; OBSERVATION AERIENNE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:37893
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Changes in the fish school structure according to external stimuli IRD
Fréon, Pierre; Soria, Marc; Gerlotto, François.
L'influence de stimuli visuels et auditifs, provenant d'un bateau de prospection ou de prédateurs, a été observée de jour sur des bancs de Clupéidés tropicaux. Ces observations #in situ$ ont été effectuées dans certains cas simultanément depuis un hydravion (ULM) et en plongée sous-marine. Dans d'autres cas on a effectué à partir d'un voilier motorisé des observations acoustiques d'un même banc lorsque le bateau se déplaçait sous-voile, puis au moteur. Il en ressort que la structure interne d'un même banc, sa forme extérieure et le volume qu'il occupe peuvent changer très rapidement dans des conditions naturelles ou en raison des perturbations provenant d'un bateau se déplaçait sous-voile, puis au moteur. Il en ressort que la structure interne d'un même...
Tipo: Text Palavras-chave: POISSON MARIN; ETHOLOGIE; STRUCTURE DE POPULATION; BANC; STIMULUS AUDITIF; STIMULUS VISUEL.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31198
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Climprood : a fully interactive expert system software for choosing and adjusting a global production model wich account for changes in environnemental factors IRD
Fréon, Pierre; Mullon, Christian; Pichon, Gaston.
Various equations allowing for the introduction of an environmental variable into different surplus production models were proposed by the first author. CLIMPROD is an experimental expert-system, using artificial intelligence, which provides a statistical and graphical description of the data set and helps the user to select the model corresponding to his case according to objective criteria. The software fits the model to the data set using a non-linear regression routine, and assesses the fit with parametric and non-parametric tests, and provides a graphical representation of the results. An example is provided on a pelagic stock, showing the strong effect of environment on long-term variability. (Résumé d'auteur)
Tipo: Text Palavras-chave: ESTIMATION DE STOCK; DYNAMIQUE DE POPULATION; UPWELLING; PROGRAMME D'APPLICATION; SYSTEME EXPERT; MODELISATION; RELATION ESPECE ENVIRONNEMENT; MODELE DE PRODUCTION.
Ano: 1989 URL: http://www.documentation.ird.fr/hor/fdi:35697
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Comparacion de datos de vientos costeros con vientos maritimos y temperature superficial del mar en el nororiente de Venezuela IRD
Fréon, Pierre; Ans, L..
Tipo: Text Palavras-chave: VENT; TEMPERATURE DE SURFACE; UPWELLING; ZONE COTIERE; MILIEU MARIN; CORRELATION; ETUDE COMPARATIVE; VARIATION SAISONNIERE; VARIATION INTERANNUELLE.
Ano: 2003 URL: http://www.documentation.ird.fr/hor/fdi:010031238
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Consequences of fish behaviour for stock assessment IRD
Fréon, Pierre; Gerlotto, François; Misund, O.A..
The influence of fish behaviour on the most common stock assessment methods is reviewed. Fish behaviour may be divided into four major groups : habitat selection, aggregation pattern, avoidance reactions, and learning. Examples of temperate and tropical species are presented. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON MARIN; ETHOLOGIE; ESTIMATION DE STOCK; ETUDE DE CAS.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:38968
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Cycle sexuel et migrations de Sardinella aurita sur le plateau continental ouest-africain, des Iles Bissagos à la Mauritanie IRD
Boëly, Thierry; Chabanne, Jacques; Fréon, Pierre; Stéquert, Bernard.
Tipo: Text Palavras-chave: POISSON MARIN; SARDINELLE; CYCLE DE REPRODUCTION; CYCLE DE DEVELOPPEMENT; MIGRATION REPRODUCTRICE; ABONDANCE; REPARTITION GEOGRAPHIQUE; VARIATION SAISONNIERE; STOCK; SARDINELLA AURITA.
Ano: 1982 URL: http://www.documentation.ird.fr/hor/fdi:17549
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Des modèles de production appliqués à des fractions de stock dépendantes des vents d'upwelling (pêche sardinière au Sénégal) IRD
Fréon, Pierre.
Tipo: Text Palavras-chave: POISSON MARIN; SARDINELLE; GESTION DE STOCK; UPWELLING; PECHE ARTISANALE; EFFORT DE PECHE; VENT; CORRELATION; PRODUCTION HALIEUTIQUE; MODELISATION; SARDINELLA AURITA; SARDINELLA MADERENSIS.
Ano: 1984 URL: http://www.documentation.ird.fr/hor/fdi:19781
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Des modèles de production appliqués à des fractions de stock dépendantes des vents d'upwelling (pêche sardinière au Sénégal) IRD
Fréon, Pierre.
Tipo: Text Palavras-chave: GESTION DE STOCK; PRODUCTION HALIEUTIQUE; MODELISATION; POISSON MARIN; ESPECE PELAGIQUE; SARDINELLE; UPWELLING; VENT; ZONE COTIERE.
Ano: 1983 URL: http://www.documentation.ird.fr/hor/fdi:16139
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Developing a basis for detecting and predicting long-term ecosystem changes IRD
Jarre, A.; Moloney, C.L.; Shannon, L.J.; Fréon, Pierre; Van der Lingen, C.D.; Verheye, H.M.; Hutchings, L.; Roux, J.P.; Cury, Philippe.
Tipo: Text Palavras-chave: MILIEU MARIN; FONCTIONNEMENT DE L'ECOSYSTEME; PREVISION; MODELISATION; SYSTEME EXPERT; ANALYSE MULTIVARIABLE; INDICATEUR ECOLOGIQUE; PRODUCTION PRIMAIRE; ZOOPLANCTON; FACTEUR ABIOTIQUE; FACTEUR CLIMATIQUE; VENT; TEMPERATURE; OXYGENE; COURANT MARIN; UPWELLING; FACTEUR ANTHROPIQUE; PECHE; POLLUTION MARINE; VARIATION INTERANNUELLE; IMPACT DE L'ENVIRONNEMENT.
Ano: 2006 URL: http://www.documentation.ird.fr/hor/fdi:010046903
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Diel variability of school structure with special reference to transition periods IRD
Fréon, Pierre; Gerlotto, François; Soria, Marc.
Pelagic fishes generally dispers at dusk and aggregate in schools at dawn. The dynamics (duration, variation in school number, and characteristics) of these two behavioural processes have been studied during a 26 h survey in a small area of high fish abundance in the Catalan Sea (Spain). The dynamics of aggregation and dispersion were investigated using a dual-beam vertical echo-sounder (BioSonics) connected to a special school integrator software package (INES-MOVIES-B) which estimates school parameters in terms of size, geometry, and density. This study shows that, during the night, fish dispersion is limited and schools can still be observed. They are characterized by a highly skewed distribution of the cross-sectional area (many small schools plus a...
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; COMPORTEMENT SOCIAL; RYTHME NYCTHEMERAL; SONAR; BANC DE POISSONS.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010008042
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Diurnal variation in fish density estimate during acoustic surveys in relation to spatial distribution and avoidance reaction IRD
Fréon, Pierre; Soria, Marc; Mullon, Christian; Gerlotto, François.
Tipo: Text Palavras-chave: CAMPAGNE OCEANOGRAPHIQUE; PROSPECTION ACOUSTIQUE; POISSON MARIN; ESPECE PELAGIQUE; ECHOINTEGRATION; RYTHME NYCTHEMERAL; DISTRIBUTION QUANTITATIVE; DENSITE; ETHOLOGIE; ECHANTILLONNAGE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:010023167
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Djifère au Sénégal : la pêche artisanale en mutation dans un contexte industriel IRD
Fréon, Pierre; Weber, J..
Tipo: Text Palavras-chave: PECHE ARTISANALE; ENGIN DE PECHE; FILET MAILLANT; ZONE DE PECHE; STOCK; INDUSTRIE DE TRANSFORMATION; SENNE TOURNANTE; MUTATION SOCIOECONOMIQUE.
Ano: 1985 URL: http://www.documentation.ird.fr/hor/fdi:31695
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Estimaciones de crecimiento, mortalidad y biomasa explotada de la sardina (Sardinella aurita) en el Oriente venezolano por medio de frecuencias de longitudes IRD
Mendoza, J.; Fréon, Pierre; Guzman, R.; Fazlul Huq, M..
Tipo: Text Palavras-chave: SARDINE; ESTIMATION DE STOCK; CROISSANCE; BIOMETRIE; MORTALITE PAR PECHE; BIOMASSE; VARIATION SAISONNIERE; RECRUTEMENT.
Ano: 2003 URL: http://www.documentation.ird.fr/hor/fdi:010031246
Registros recuperados: 92
Primeira ... 12345 ... Última
 

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