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| Registros recuperados: 22 | |
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| Le Gall, Jean-yves. |
| In the Marsden Square Grid System, or its derivations - and this is the system that most national and international oceanographic data acquisition centres employ - the information is located geographically for statistical purposes by means of a grid consisting of 10°, 5° or 1° " squares ". The system, an early one dating from 1850, has three major disadvantages, and this has meant that its numbering principle cannot be used for a grid whose smallest lattice is less than 1° of latitude by 1° of longitude. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/1974/publication-5157.pdf |
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| Laurec, Alain; Le Gall, Jean-yves. |
| Two different statistical techniques of analysis have been worked out in order to analyse the components of available data of catch per unit of effort (C. P. U. E. by month), used as an abundance index, for the Atlantic Japanese tuna longline fishery harvesting north-southern stocks of albacore (Thunnus alalunga). These techniques have been developed in order to estimate different components of this abundance index, such as yearly trend, a seasonal component, fishing effort impact, and unknown residual component. Both techniques combine these components either in an additive model or multiplicative one and allow to assign to the trend a continuous or discrete (stepwise) shape. The first technique is simple, it is called " moving average " and applies... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-5085.pdf |
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| Le Gall, Jean-yves. |
| Au cours de la mission PHYGIB du navire océanographique NOROIT, campagne d'études hydrologiques et courantométriques organisée par le Centre Océanologique de Bretagne (C.N.E.X.O.) et axée sur l'étude de la dispersion du courant d'eau d'origine méditerranéenne entre le Détroit de Gibraltar et le Banc de la Joséphine, six stations de courantométrie furent effectuées par mouillage d'une ligne de courantomètres, totalisant ainsi 3000 heures d'enregistrement (MADELAIN, 1971). [OCR NON CONTRÔLE] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-5044.pdf |
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| Le Gall, Jean-yves. |
| One of the most distant, but also the most fruitful perspective in the field of aquaculture seems to be the repopulation of fishing areas through human intervention. The current repopulation trials of the lobster beds of the Armorican continental shelf and especially those of the Belle-Ile, Houat and Hoedic archipelago provide an opportunity to study objectively this new trend: "repopulation experiment". This opportunity was seized in 1973 and materialized by the beginning of a collaboration between the CNEXO and the UNICOMA on the objective assessment, through a scientific analysis of the possible impact, of the repopulation of the lobster beds exploited by the fishermen belonging to the Groupement des Pêcheurs Artisans d'Houat (GPAH) (Houat fishers... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5988.pdf |
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| Le Gall, Jean-yves; Mauviot, Jean-charles; Metailler, Robert; Berthou, Patrick. |
| Juvenile lobsters were reared for 8 months individually in separate tanks in order to obtain separate estimates of growth. Five batches were studied separately according to the type of diet : deep-frozen krill, paste, ¿try pellets and moist pellets. Growth data were collected over 15 first molt stages for each type of prepared diet. Observations deal with size and weight increments at moult and with weight/length relationships. Regression of total lengths over carapace lengths were fitted in each case. |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00305/41605/40814.pdf |
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| Le Gall, Jean-yves; Bosc, Pierre; Taquet, Marc. |
| A research programm on the marine green turtle Chelonia mydas nesting on the two major reproduction sites for the species in the Indian Ocean, conducled over last 15 years, included intensive tagging programm. Processing of these lagging data provides estimations of adult female populations {or each site and season from two independent methods. First classical method is the ratio of total number of nests produced over a define time on the mean individual number of nests by female during the same time (November, December, January). The computed mean individual number ranges from 3 to 3.5 obtained over 2 to 3 months. The second method is the multiple capture-recapture method (JOLLY, 1965; SEBER, 1965; MANLY, 1984). Il is an original tentative of applying... |
| Tipo: Text |
Palavras-chave: Tortue verte; Chelonia mydas; Reproduckion; Ponte; Population; Femelles; Marquage; Recapture; Océan Indien.; Marine green turtle; Chelonia mydas; Capture; Recapture; Indian Ocean; Nesting; Populations; Tagging; Reproduction. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00113/22406/20103.pdf |
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| Le Gall, Jean-yves; Laurec, Alain; Bard, François-xavier; Dao, Jean-claude. |
| Cette étude intègre simultanément les données de la pêcherie palangrière de l'Atlantique Nord Central (prises annuelles en nombre par classes d'âge à partir des échantillonnages de la pêcherie japonaise) et les données de la pêcherie de surface franco-espagnole de l'Atlantique Nord-Est (prises annuelles en nombre par classes d'âge à partir des échantillonnages de la pêcherie française). L'analyse des cohortes sur ces données conduit à des estimations de Fi et de tailles de cohortes au recrutement et la sortie de la pêche de surface, puis au recrutement de la pêcherie palangrière. Le recoupement et le recouvrement de ces résultats permettent de construire une série de Fi et, à partir des données de Mi extraites d'autres études, d'appliquer les modèles... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/1974/publication-5469.pdf |
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| Berthou, Patrick; Le Gall, Jean-yves. |
| La convention de recherches visant à la gestion rationnelle des stocks de praires sur la Côte Ouest du Cotentin, établie en septembre 1977 entre le Comité Local des Pêches Maritimes de GRANVILLE et l'Etablissement Public Régional de Basse Normandie pour le financement d'une part, et le Centre Océanologique de Bretagne (CNEXO/COB) pour l'analyse scientifique d'autre part, entre dans sa troisième année. Les travaux effectués dans ce cadre ont fait l'objet de deux rapports: 1 - Résultats préliminaires sur les caractéristiques biologiques de l'espèce et éléments de production de la pêcherie de GRANVILLE (janvier 1978) 2 - Analyse des caractéristiques de la pêcherie granvillaise et compléments biologiques (reproduction) (septembre 1978). Le rapport présent,... |
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| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00094/20513/18183.pdf |
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| Berthou, Patrick; Le Gall, Jean-yves. |
| Les premières observations sur la biologie et la pêche de la praire à GRANVILLE, très directement orientées vers;l'évaluation du stock Ouest Cotentin, la connaissance de la dynamique des populations constituant ce stock et devant conduire à l'élaboration de recommandations objectives, scientifiques pour l'aménagement de la pêChe, datent de septembre 1977. Le programme de recherches échelonnées sur trois années, sur un financement E.P.R.Basse Normandie, mis en oeuvre par le Comité Local des Pêches Maritimes de GRANVILLE, avec le support logistique, technique, scientifique du Centre Océanologique de Bretagne (CNEXO) vient donc à son terme comme prévu, en fin 1980. Ce quatrième rapport, qui couvre donc les activités développées au cours de cette troisième... |
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| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/00089/19982/17647.pdf |
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| Le Gall, Jean-yves. |
| The word "Krill" has been used, then largely adopted, to designate the enormous concentrations of Euphausiacea Euphausia superba in the Antarctic Oceanic areas which represent the largest part of whales' diet. From a scientific, taxonomic and biological point of view, this word "Krill" can be applied without any restriction to the summer concentrations of Euphausiacea appearing in July off the Cap Finisterre and named "Rouges de crevettes" (shrimps' reds) by albacore fishermen. The only difference is that these superficial concentrations are almost exclusively made up of another species of Euphausiacea, largely widespread in the whole North Atlantic Ocean: Meganyctiphanes norvegica whose size does not exceed three centimetres. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5068.pdf |
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| Le Gall, Jean-yves; L'Herroux, Michel. |
| 1 - The authors study and compare the biovolumes of 69 samples taken with the Isaacs-Kidd midwater trawl during the Polymède expedition on the N. O. "Jean Charcot" (May and June, 1970) in the western Mediterranean and in the vicinity of Cap Finisterre. 2 - The authors, having assembled the measurements of physical oceanographers, have prepared a diagram of the deep-current issuing from the Mediterranean into the Atlantic North- East. It is possible to superimpose on this diagram the route used by the young albacore (Thunnus alalunga) during their annual summer migration. This correspondance suggests an inter-relation between the two phenomena provided by intermediate trophic levels. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1971 |
URL: http://archimer.ifremer.fr/doc/1971/rapport-4850.PDF |
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| Le Gall, Jean-yves; Laurec, Alain; Chardy, Pierre. |
| The study is based on available data of previous descriptive works dealing with the diagnostic characters of genus Thunnus seven species ; multivariable technics analysis are used for classification and ordination in order to examine the validity of specific groups usually admitted by classical technics of taxonomy analysis. Respective values of visceral, squelettic and meristic characters are reviewed. Building of a cladogram (by cladistic analysis) based on the coding of 12 characters with evolutive processes meaning leads to submit some hypothesis on phylogenetic relationships between species and group of species recognized progress of the present study. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-5474.pdf |
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| Le Gall, Jean-yves; Cayre, Patrice; Taquet, Marc. |
| The international symposium "Tuna Fishing and Fish Aggregating Devices " , October 1999, in Martinique, takes stock of the exploitation of large pelagic fish around FADs, based on regional synthesis for the three oceans and the Mediterranean Sea. Main themes include technology, fishing methods, impact on resources, biology of fish aggregation, anthropology and economic aspects of FAD exploitation. The meeting will gather and disseminate results from recent and ongoing studies on FADs in the different oceans of the world, enhance collaboration between scientists and managers involved in the development of FADs, promote the emergence of scientific and technical research, form a network for cooperation and enhance communications between researchers in the... |
| Tipo: Text |
Palavras-chave: Économie; Pêche; Ressource halieutique; Technique de pêche. |
| Ano: 2000 |
URL: https://archimer.ifremer.fr/doc/00042/15326/12646.pdf |
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| Registros recuperados: 22 | |
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