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Registros recuperados: 52
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A methodology for acoustic assessment in very shallow waters (less than 8 m) IRD
Gerlotto, François; Hernandez Corujo, C.; Claro, R..
Une méthodologie de prospection acoustique et de traitement des données pour l'évaluation des biomasses est proposée pour les systèmes lagonaires tropicaux, à fond plat, profondeurs faibles (de 3 à 8 m) et houle réduite. Les méthodes de mesure de l'angle d'échantillonnage et de déconvolution des TS #in situ$ sont adaptées de la littérature pour ce cas particulier. L'application de cette méthodologie au golfe de Batabano (Cuba) montre que les meilleures évaluations de biomasses sont obtenues par comptage, et que la précision des mesures dépend étroitement des conditions extérieures : prospection de nuit exclusivement, mer plate et absence de lune. (Résumé d'auteur)
Tipo: Text Palavras-chave: METHODOLOGIE; PROSPECTION ACOUSTIQUE; POISSON; BIOMASSE; LAGON.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31200
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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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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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Balistes carolinensis, nouveau stock africain IRD
Caverivière, Alain; Gerlotto, François; Stéquert, Bernard.
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE COMMERCIALE; DISTRIBUTION SPATIALE; ABONDANCE; BIOMASSE; ESTIMATION DE STOCK; REPRODUCTION; FACTEUR ECOLOGIQUE; BALISTIDAE; BALISTES CAROLINENSIS.
Ano: 1980 URL: http://www.documentation.ird.fr/hor/fdi:03929
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Bilan des connaissances actuelles sur Balistes carolinensis dans le golfe de Guinée IRD
Caverivière, Alain; Kulbicki, Michel; Konan, J.; Gerlotto, François.
Tipo: Text Palavras-chave: POISSON MARIN; ABONDANCE; VARIATION SAISONNIERE; REPRODUCTION; CROISSANCE; REPARTITION VERTICALE; ALIMENTATION ANIMALE; BALISTIDAE; BALISTES CAROLINENSIS.
Ano: 1981 URL: http://www.documentation.ird.fr/hor/fdi:02787
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Biologie de Ethmalosa fimbriata (Bowdich) en Côte d'Ivoire : 2. Etude de la croissance en lagune par la méthode de Petersen IRD
Gerlotto, François.
Tipo: Text Palavras-chave: POISSON MARIN; CROISSANCE; METHODE D'ANALYSE; ECHANTILLONNAGE; STRUCTURE DE POPULATION; VARIATION SPATIALE; METHODE DE PETERSEN; COURBE DE VON BERTALANFFY; ETHMALOSA FIMBRIATA.
Ano: 1976 URL: http://www.documentation.ird.fr/hor/fdi:32214
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Biologie de l'ethmalose (Ethmalosa fimbriata Bowdich) en Côte d'Ivoire : 1. Description de la reproduction et des premiers stades larvaires IRD
Albaret, Jean-Jacques; Gerlotto, François.
Tipo: Text Palavras-chave: POISSON MARIN; REPRODUCTION; MATURITE SEXUELLE; FECONDITE; PONTE; DEVELOPPEMENT BIOLOGIQUE; EMBRYOGENESE; OEUF; LARVE; ECHANTILLONNAGE; STRUCTURE DE POPULATION; ETHMALOSA FIMBRIATA.
Ano: 1976 URL: http://www.documentation.ird.fr/hor/fdi:32213
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Campagne d'écho-intégration Echoproc : résultats d'observations IRD
Stéquert, Bernard; Gerlotto, François; Le Philippe, Victor.
Tipo: Text Palavras-chave: CAMPAGNE OCEANOGRAPHIQUE; PROSPECTION ACOUSTIQUE; ECHOINTEGRATION; SONAR; ETALONNAGE; CHALUTAGE; CAPTURE; ANALYSE QUALITATIVE; ANALYSE QUANTITATIVE; BIOMETRIE; POISSON MARIN; STOCK; COMPOSITION DES PRISES.
Ano: 1977 URL: http://www.documentation.ird.fr/hor/fdi:09091
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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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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 biologique de l'ethmalose en lagune Ebrié IRD
Gerlotto, François.
Tipo: Text Palavras-chave: POISSON; REPRODUCTION; MIGRATION; FACTEUR ECOLOGIQUE; SALINITE; CLUPEIDAE; ETHMALOSA FIMBRIATA.
Ano: 1981 URL: http://www.documentation.ird.fr/hor/fdi:29065
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Data stratification and pelagic fish density evaluation in Java Sea IRD
Petit, Didier; Gerlotto, François; Petitgas, Pierre.
Biomass evaluation by means of echo-integration, needs to be applied with strictness. The better the dominant factors acting on the area are targeted and analyzed, the better will be the accuracy of estimation. A phase of descriptive observation is necessary, taking into account abiotic and biotic factors, as well as the one on species behaviour, as it can appear throughout the acoustics tool. This descriptive stage will comfort the elaboration of a stratification which will serve as a model to calculate the abundance level and its accuracy. During acoustic cruises performed from 1992 to 1994 in the Java Sea open waters, various parameters were measured. Regional differences can be observed, and they allow a three-area stratification to be elaborated....
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; ACQUISITION DE DONNEES; ECHOINTEGRATION; REPARTITION GEOGRAPHIQUE; VARIATION SPATIALE; STRATIFICATION.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017251
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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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Elevage en bassin de Balistes carolinensis : méthodologie et premiers résultats IRD
Gerlotto, François; Kulbicki, Michel.
Tipo: Text Palavras-chave: ELEVAGE; METHODE D'ELEVAGE; ALIMENTATION ANIMALE; CROISSANCE; MARQUAGE; MORTALITE; MILIEU ARTIFICIEL; OXYGENE DISSOUS; SALINITE; TEMPERATURE; VARIATION TEMPORELLE; POISSON MARIN; BALISTIDAE; BALISTES CAROLINENSIS.
Ano: 1980 URL: http://www.documentation.ird.fr/hor/fdi:00009
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Evaluation of the influence of vessel noise on fish distribution as observed using alternately motor and sails aboard a survey vessel IRD
Fréon, Pierre; Gerlotto, François; Soria, Marc.
L'influence du bruit du moteur d'un bateau de prospection sur les poissons a été étudiée en utilisant alternativement la navigation sous voile et au moteur à bord d'un voilier de 16 mètres équipé d'un moteur diesel inboard de 116 cv. Trois expériences ont été réalisées de nuit sur deux types de population de poissons tropicaux : l'une au large sur des poissons dispersés (probablement des poissons volants et des Myctophydés de la DSL), l'autre sur une couche de poissons pélagiques côtiers (probablement de jeunes Clupéidés et quelques mulets). Dans les trois cas on a observé aucune différence significative de l'influence du bruit du moteur sur la densité, et seulement une faible réaction d'évitement vertical (plongée inférieure à un mètre) s'est produite....
Tipo: Text Palavras-chave: POISSON MARIN; ETHOLOGIE; NAVIRE DE RECHERCHE; MOTEUR; BRUIT.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31197
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Exploration of the applicability of geostatistics to fisheries acoustics IRD
Simard, Y.; Gerlotto, François.
L'applicabilité de la géostatistique pour l'analyse de données d'écho-intégration est explorée à l'aide de deux ensembles de données provenant des eaux côtières du nord de la Norvège et du Vénézuela. Les écarts aux conditions de stationnarité et les variations temporelles des structures spatiales sont examinées en portant une attention spéciale aux effets de : (1) l'utilisation des données brutes ou transformées en unités logarithmiques, (2) l'exclusion ou l'inclusion des séries de zéros, (3) différences jour/nuit dans les structures spatiales, (4) double échantillonnages et (5) différentes communautés de poissons. Tous ces facteurs affectèrent fortement la forme des variogrammes calculés, et conséquemment les estimations de biomasse qui en étaient...
Tipo: Text Palavras-chave: POISSON MARIN; ECHOINTEGRATION; ANALYSE DE DONNEES; GEOSTATISTIQUE; VARIATION SPATIALE; VARIATION TEMPORELLE; VARIOGRAMME.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31202
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Gregariousness and school behaviour of pelagic fish : impact of the acoustics evaluation and fisheries IRD
Gerlotto, François.
Pelagic fish (Clupeids, Carangids, Engraulids, Scombroids, etc.) are normally forming dense schools, gathering over tens of thousands of individuals. This paper defines the concept of fish schools for fishery acoustics, and describes briefly their main dynamic mechanisms. The kind of spatial distribution, due to this behaviour, makes the design of appropriate sampling methodologies necessary. The effect of the heterogeneity in the spatial distribution of fish density is discussed. The impact of gregariousness on the validity of acoustic data is described, as well as the main behavioural features : horizontal and vertical school avoidance, acoustic shadowing, diving and dial cycles are factors to be taken into account in the acoustic methodology. Under some...
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; ETHOLOGIE; BIOMASSE; EVALUATION; METHODOLOGIE; SONAR; BANC DE POISSONS.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017257
Registros recuperados: 52
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