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Registros recuperados: 23
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Calanoides carinatus (copépode pélagique) sur le plateau continental congolais : 1. Aperçu sur la répartition bathymétrique, géographique et biométrique des stades; générations durant la saison froide 1974 IRD
Petit, Didier; Courties, Claude.
Tipo: Text Palavras-chave: PLATEAU CONTINENTAL; ESPECE PELAGIQUE; REPARTITION VERTICALE; ZONATION ECOLOGIQUE; REPARTITION GEOGRAPHIQUE; MIGRATION VERTICALE; BIOMETRIE; ABONDANCE; VARIATION SAISONNIERE; CRUSTACEA; COPEPODA; CALANIDAE; CALANOIDES CARINATUS; STADE COPEPODITE.
Ano: 1976 URL: http://www.documentation.ird.fr/hor/fdi:19720
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Calanoides carinatus (copépode pélagique) sur le plateau continental congolais : 3. Abondance, tailles et temps de génération : relations avec la chlorophylle IRD
Petit, Didier.
Tipo: Text Palavras-chave: SYNECOLOGIE; ESPECE PELAGIQUE; PLATEAU CONTINENTAL; CYCLE DE DEVELOPPEMENT; DISTRIBUTION SPATIALE; COMPETITION; RELATION TROPHIQUE; CRUSTACEA; COPEPODA; CALANIDAE; CALANOIDES CARINATUS.
Ano: 1982 URL: http://www.documentation.ird.fr/hor/fdi:02154
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Calanoides carinatus (Copépode planctonique) sur le plateau continental congolais : 2. Aspect de la variabilité "ponctuelle" de l'abondance des stades copépodites et des adultes : choix d'une transformation : comparaison des efficacités de capture de deux filets IRD
Petit, Didier.
Tipo: Text Palavras-chave: PLATEAU CONTINENTAL; DYNAMIQUE DE POPULATION; ECHANTILLONNAGE; VARIABILITE; VARIANCE; CAPTURE; FILET; ETUDE COMPARATIVE; CRUSTACEA; COPEPODA; CALANIDAE; CALANOIDE CARINATUS.
Ano: 1978 URL: http://www.documentation.ird.fr/hor/fdi:19768
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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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Densities and behaviour of pelagic fish population along the Java and Sumatra coasts in wet season IRD
Petit, Didier; Cotel, Pascal; Nugroho, D..
The coastal borders of northern Java and eastern Sumatra have been prospected during the acoustic surveys, in the depth of about 115 to 50 m, in wet season. The measures of relative density per nautical mile, the vertical distribution of the abundance and shoals have been analyzed. The general characteristics can be drawn-up : they are the extension of an abundant semipelagic fauna occupying the bathymetric strata from 25 to 45 m, and the existence of a dominant pelagic fauna are more coastal. Shoals, low reverberating, are present in all areas but are dominant in the coastal border ; the more reverberating aggregations are more off shore. From the East to the West, their bathymetric localization increases in the sectors near oceanic influences, they are...
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; ZONE COTIERE; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; REPARTITION VERTICALE; ETHOLOGIE; RYTHME NYCTHEMERAL; VARIATION SAISONNIERE; SAISON HUMIDE; ZONATION ECOLOGIQUE.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017252
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Données sur la morphologie et la croissance chez le genre Lucifer (décapodes Sergestidae) : L. intermedius, L. penicillifer, L. hanseni, L. chacei, L. faxonii IRD
Petit, Didier; Fazeleabasse, M. (ill.).
Tipo: Text Palavras-chave: ANATOMIE ANIMALE; CROISSANCE; CRUSTACEA; DECAPODA; SERGESTIDAE; LUCIFER INTERMEDIUS; LUCIFER PENICILLIFER; LUCIFER HANSENI; LUCIFER CHACEI; LUCIFER FAXONII.
Ano: 1973 URL: http://www.documentation.ird.fr/hor/fdi:19654
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Fishing strategies and tactics in the Javanese seiners fisheries IRD
Potier, Michel; Petit, Didier.
Fishing strategies and tactics are related to the knowledge fishermen have about environment, to the behavior of the fish and to the socio-economical factors which affect the fishery. The fishermen knowledge is applied to the strategy (time scale from the trips - less than one month up to one year), and to the tactics which is the way fish are caught (time scale, fishing operations). The strategy of the Javanese fishermen is highly correlated with the monsoons regime. The alternation of these seasons induces changes in the abundance of fish in the Java Sea. Fishermen choose their fishing areas according to the fluctuation of the abundance. Before 1992, the trip strategy was to choose one fishing ground and to spend all the fishing days in this zone. Since...
Tipo: Text Palavras-chave: PECHE MARITIME; TECHNIQUE DE PECHE; SENNE; ZONE DE PECHE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:42772
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Influence of the light of a survey vessel on TS distribution = Influence de l'éclairage d'un navire de recherches en prospection acoustique sur la distribution des TS IRD
Gerlotto, François; Petit, Didier; Fréon, Pierre.
Des mesures d'écho-intégration et de TS #in situ$ effectuées de nuit à l'aide d'un sondeur à faisceaux concentriques ont permis de vérifier l'effet d'éclairement d'un navire de prospection sur les distributions bathymétriques des poissons. Deux résultats principaux ont été obtenus : les poissons des couches supérieures, contrairement à ce qu'avaient montré d'autres expériences dans la même zone, n'ont pas plongé lors des périodes éclairées, mais ont en partie évité latéralement le bateau, l'importance de cet évitement étant apparemment à relier à la taille et/ou à l'espèce des poissons; si l'on ne tient pas compte de la disparition des cibles les plus importantes, les niveaux de réflectivité moyens n'ont pas varié entre périodes obscures et éclairées, ce...
Tipo: Text Palavras-chave: PROSPECTION ACOUSTIQUE; POISSON MARIN; ETHOLOGIE; ECLAIREMENT; DISTRIBUTION SPATIALE.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31196
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Interaction between fish and fishing vessels in the Javanese purse seine fishery ArchiMer
Potier, Michel; Petitgas, Pierre; Petit, Didier.
The purse-seiners of the Java Sea use light and fish aggregating devices (FAD) to concentrate and catch small pelagic fish (Decapterus sp., Amblygaster sirm, Sardinella gibbosa). This sets a question about the interaction between fish and fishing vessels. Relevant estimates of fishing mortality and fishing effort require an understanding of this interaction. To gain information on this relationship, acoustic surveys were performed on the fishing grounds and the present paper analyses these data. Using acoustic surveys, the fish density was measured and the number of schools was counted per sea surface unit. The fishing vessels were located by radar. Acoustic data were stratified into two groups, one where fishing vessels were present and the other where...
Tipo: Text Palavras-chave: Pêche; Acoustique; Structures spatiales; Pélagiques; Mer de Java; Indonésie; Fishing operation; Echo surveys; Spatial structure; Pelagic fish; Java Sea; Indonesia.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00188/29884/28343.pdf
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Pelagic fish abundance from Semarang (Central Java) to South China Sea in April 1993 IRD
Petit, Didier; Nugroho, D.; Potier, Michel.
An acoustic survey, from Semarang towards the South China Sea, allows the haline situation and the distribution of abundance in pelagic fishes at the end of the wet season to be described. At that moment, the fleet of Javanese seiners operates in the south-west of the Natuna Islands, in depths of 50 meters. The analysis of haline vertical profiles shows the presence of three zones : the Java Sea with vertical gradients due to the coastal desalinization, the Karimata Strait with isohaline water at 33.5% and the South China Sea with deep waters at 34%. The last sector where the fleet was operating, was three times richer than the Javanese waters at that time. Without direct correlation with that, the zonation of the abundance (scattered or aggregated fishes)...
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; SALINITE; DENSITE DE POPULATION; VARIATION SPATIALE; REPARTITION VERTICALE; RYTHME NYCTHEMERAL; PROSPECTION ACOUSTIQUE; ABONDANCE; BANC.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017255
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Pelagic fish shoals in the Java Sea IRD
Nugroho, D.; Petit, Didier; Cotel, Pascal; Luong, N..
Two acoustical surveys took place in October 1993 and February 1994, covering the main part of the Java Sea, below a 50 m depth. The echo-integration process was performed through a BioSonics 120 kHz Dual Beam echo-sounder. Fish shoal characteristics and their behavioural aspects were observed. The shoals' configurations were extracted from the echograms and quantified. This information allows the spatial and bathymetric distribution to be presented. An analysis on the abundance and the distribution of shoals is proposed, as well as their contribution to the global clusters and a description of their behaviour during the day and night periods. (Résumé d'auteur)
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; REPARTITION GEOGRAPHIQUE; REPARTITION VERTICALE; RYTHME NYCTHEMERAL; PROSPECTION ACOUSTIQUE; ECHOINTEGRATION; SONAR; BANC.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017250
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Reaction of tropical coastal pelagic species to the artificial lighting and impacts on the estimations of abundance by echo-integration IRD
Levenez, Jean-Jacques; Gerlotto, François; Petit, Didier.
Des études sur le comportement du poisson en milieu tropical et ses conséquences sur les estimations de biomasse par echo-intégration ont été menées de chaque côté de l'Atlantique, au Sénégal et au Vénézuela. Trois séries d'observations réalisées de nuit à des profondeurs comprises entre 15 et 30 mètres ont montré que lorsque les lumières de pont sont allumées sur les bateaux de recherches, les poissons plongent et/ou s'écartent, mais que les conséquences, en ce qui concerne les évaluations de biomasse, dépendent des espèces, de l'orientation de l'éclairage du bateau et de la vitesse de ce dernier. Quand les lampes éclairent latéralement (Sénégal) les évaluations de biomasse peuvent être grandement sous-estimées, tandis que si les lumières sont focalisées...
Tipo: Text Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; ECHOINTEGRATION; ECLAIREMENT; BIOMASSE; -.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:31195
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Spatial distribution of small pelagic fish in the lagoon of New Caledonia IRD
Conand, François; Boëly, Thierry; Petit, Didier.
Two acoustic surveys have been done in the lagoon all around New Caledonia, with a digital integrator. The cruises lasting two weeks were done at six month interval. Much information has been obtained on stock biomass and spatial distribution of fish and schools. Fish are dispersed at night and stay near the surface. During the day they form schools, usually of very small size. Some species are found mostly along the coasts, on the reef flats and far inside in the bays. Some others stay in the middle of the bays or in the central part of the lagoon and occur usually in deeper water at some distance of the bottom. Aerial and diving observations have shown that the fish of coastal schools were feeding on the reef. Species schooling during the day in the...
Tipo: Text Palavras-chave: LAGON; RECIF CORALLIEN; POISSON; ESPECE PELAGIQUE; DYNAMIQUE DE POPULATION; DISTRIBUTION SPATIALE; BIOMASSE; STOCK.
Ano: 1988 URL: http://www.documentation.ird.fr/hor/fdi:42377
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Target strength measurements on three pelagic fishes from the Java Sea IRD
Cotel, Pascal; Petit, Didier.
Using acoustics for biomass evaluation, the back scattering cross section of species has to be determined to convert the data into weighted values. During the cruises of the EU Project "Java Sea Pelagic Fishery", TS measurements on 3 pelagic fishes of economic importance : #Decapterus russelli$, #Selar crumenophthalmus$, and #Rastrelliger kanagurta$ were carried out, using a BioSonics dual beam echo-sounder at a frequency of 120 kHz. The observations on single or multiple targets in a cage, revealed a large dispersion of the responses, even in the same experiment. These results are discussed and compared with Johannesson's (Anonymous, 1984) in the same area. (Résumé d'auteur)
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; EVALUATION; SONAR; INDICE DE REFLEXION.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017253
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Temps de développement des oeufs, durée de vie des copépodites 4, 5 et des adultes de Calanoides carinatus (copépode planctonique) IRD
Tomasini, Jean; Petit, Didier.
Tipo: Text Palavras-chave: ZOOPLANCTON; DEVELOPPEMENT BIOLOGIQUE; OEUF; PONTE; ETUDE EXPERIMENTALE; FACTEUR ABIOTIQUE; TEMPERATURE; CRUSTACEA; COPEPODA; CALANIDAE; CALANOIDES CARINATUS.
Ano: 1977 URL: http://www.documentation.ird.fr/hor/fdi:08719
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Tentative relation between acoustics and dynamics : a case study : the purse seine fishery of the Java Sea IRD
Potier, Michel; Petitgas, Pierre; Petit, Didier.
The purse seiners of the Java Sea use light and Fish Aggregating Devices (FAD) to catch the fish. The use of such fishing devices invites questions on the relation which can exist between fish and the fishing vessels. The use of acoustic cruises on fishing grounds, linked with the location of fishing vessels, can give us a first knowledge of such a relation. In the Java Sea, it seems that the fishermen are able to detect fish concentrations, even if they are close to the bottom. They increase a natural phenomenon which is the rising of this fish population at night. With the lights, they seem to alter the distribution of the fish within these concentrations, in order to aggregate it around the vessels and to catch it. (Résumé d'auteur)
Tipo: Text Palavras-chave: PECHE ARTISANALE; SENNEUR; TECHNIQUE DE PECHE; POISSON MARIN; ESPECE PELAGIQUE; DENSITE DE POPULATION; VARIATION TEMPORELLE; RYTHME NYCTHEMERAL.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017256
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The Java Sea environment IRD
Durand, Jean-René; Petit, Didier.
The Java Sea is mainly a continental shelf with an average depht of 40 m and is controlled by the monsoon cycle : eastward current during North-West monsoon, westward current during South-East monsoon. Surface salinity is the best known parameter and its variations allow to describe the global circulation scheme in the Java Sea region. More in depth studies should be conducted to give a more accurate description which would take into account variability according to water depth, regions and years. Despite scarce environmental data, hypothesis on the level of productivity and a more oriental definition of the Java Sea pelagic resources system are given in this article. (Résumé d'auteur)
Tipo: Text Palavras-chave: MER; CARACTERISTIQUE PHYSIQUE; SALINITE; TEMPERATURE; CLIMATOLOGIE; COURANTOMETRIE; PRODUCTIVITE BIOLOGIQUE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:42768
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The PELFISH surveys : objectives and data collection IRD
Petit, Didier; Cotel, Pascal; Nugroho, D..
From 1991 to 1995, twenty acoustic surveys took place in the Java Sea and the surrounding areas in the frame of the PELFISH Project, sponsored by the European Union, Indonesia and France. Their aim was to study the distribution, abundance and behaviour of the pelagic fauna, especially on the fishing grounds of the seiners. It needed various operations as environmental measurements, echo-integration, TS measurements, school localization, light attraction and trawl samplings. The scientific equipment and its adjustment, as well as the procedures of data acquisition used, are summarized (acoustic and physical measurements, samplings). The spatial, diurnal and bathymetric distribution of the sampling show that the data collection can give accurate information...
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; POISSON MARIN; ESPECE PELAGIQUE; ACQUISITION DE DONNEES; ECHOINTEGRATION; TRAITEMENT DE DONNEES; ECHANTILLONNAGE; VARIATION SAISONNIERE; RYTHME NYCTHEMERAL; DISTRIBUTION SPATIALE; BATHYMETRIE.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017246
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The seasonal variations of salinity in the Java Sea IRD
Petit, Didier; Cotel, Pascal; Nugroho, D..
The climate in the Javanese basin is a monsoon regime : dry from June to September and humid from November to March. In regions seasonally subject to substantial precipitation, salinity is one of the more important factors affecting the distribution and abundance of fauna. For this reason, stationary vertical profiles have been performed to measure the variations of salinity. These measurements took place during the acoustic surveys carried out in the Java Sea in the framework of the PELFISH Project. Two surveys covering the central part, the first one in October, the second one in February, supply spatial and bathymetric localization of different water masses. Other transects, from Semarang (Central Java) to the Matasiri Islands, all along the north...
Tipo: Text Palavras-chave: EAU DE MER; SALINITE; PROFIL VERTICAL; VARIATION SPATIALE; VARIATION SAISONNIERE; CLIMAT; VENT; MOUSSON.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017247
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Vertical distribution and circadian cycle of pelagic fish density in the Java Sea IRD
Luong, N.; Petit, Didier.
Analyses of the acoustical data collected during several cruises made in the Java Sea from 1991 to 1994, in the context of the Pelfish project, have facilitated the elaboration of a biological model based on three groups of fish, each having particular distribution characteristics. This paper shows how the analysis of bathymetric distribution on the same database gives valuable information on fish behaviour, and how this method could be used first to define different groups of fish (in our case, to increase the types up to five groups) and secondly, to raise several questions on the determinants of the fish distribution. (Résumé d'auteur)
Tipo: Text Palavras-chave: RESSOURCES HALIEUTIQUES; DENSITE DE POPULATION; ETHOLOGIE; MODELE; REPARTITION VERTICALE; ZONE COTIERE; BATHYMETRIE; RYTHME NYCTHEMERAL.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010017249
Registros recuperados: 23
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