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| Registros recuperados: 35 | |
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| Buestel, Dominique; Dao, Jean-claude; Gohin, Francis. |
| The efficiency of the fishing drags in the Saint Brieuc Bay, Brittany, has been determined through the analysis of the tracks left on the seabed. The results, which focus mostly on the age class n°2 (2.5 years), show that the efficiency and the damages caused by the drags vary heavily according to the nature of the seabed. For soft bottoms, the average efficiency is 67 % and the global damage is 2 %. Concerning hard bottoms, the values are respectively 30 % and 17 %. These efficiency results combined with those of a dragging expedition in a set sector of the Saint-Brieuc Bay enable a direct assessment of the abundance. A result treatment method deriving from the geostatistical theory is used: it takes into account the spatial structure of the king scallop... |
| Tipo: Text |
Palavras-chave: Coquille Saint Jacques; Plongée; Dragage; Pecten maximus L.; Estimation stocks. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-6536.pdf |
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| Dao, Jean-claude; Gerard, Andre; Buestel, Dominique. |
| Research on the black scallop followed that on the king scallop. Indeed, over the 1973-1975 " spadework » period, it has been demonstrated that the roadsted of Brest was: - an overexploited king scallop deposit; the broodstock not being able to ensure a satisfying renewal of the species. - a black scallop production deposit (hundreds of tonnes). In parallel, the collection trials provided null results for the king scallop but very interesting results for the black scallop (thousands of spats per collector). From 1976 onwards, the spat collecting operations did not focus on king scallop juveniles anymore, but on black scallop. |
| Tipo: Text |
Palavras-chave: Reproduction; Captage; Physiologie; Pétoncle; Chlamys varia. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-6538.pdf |
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| Berthou, Patrick; Poutiers, Jean-maurice; Goulletquer, Philippe; Dao, Jean-claude. |
| Shelled molluscs are comprised of bivalves and gastropods. They are settled mainly on the continental shelf as benthic and sedentary animals due to their heavy protective shell. They can stand a wide range of environmental conditions. They are found in the whole trophic chain and are particle feeders, herbivorous, carnivorous, and predators. Exploited mollusc species are numerous. The main groups of gastropods are the whelks, conchs, abalones, tops, and turbans; and those of bivalve species are oysters, mussels, scallops, and clams. They are mainly used for food, but also for ornamental purposes, in shellcraft industries and jewelery. Consumed species are produced by fisheries and aquaculture, the latter representing 75% of the total 11.4 millions metric... |
| Tipo: Text |
Palavras-chave: Management; Fishing gears; Biology; Aquaculture; Fisheries; Gastropods; Bivalves. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2001/publication-529.pdf |
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| Buestel, Dominique; Arzel, Pierre; Cornillet, Paulette; Dao, Jean-claude. |
| It is attempted to produce large quantities of 25 mm scallop juveniles suitable for restocking the beds. A first breeding experiment in laboratory gave a very low survival rate : about 1% from the D larvae stage to reach the size of 1 mm. The growth after metamorphosis is very irregular and slow, compared to the datas obtained in natural environment. An experimental programme of spat collection in natural environment, completed by hanging culture has been conducted. An average number of 300 spats (size 15 mm) per collector has been obtained in 1976. Banging culture allows to reach the size of 25 mm three months after settlement with a very good survival rate. The yield of a large number of spat from collectors seems to demonstrate that there is a future... |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00305/41599/40808.pdf |
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| Dao, Jean-claude; Fleury, Pierre-gildas; Paquotte, Philippe. |
| The article is an excerpt from a focus document for understand scallop aquafarming's position. Studies on this species are part of IFREMER/DRV research programmes as an aquafarming as well as a halieutic resource. They are currently becoming reality through significant support for fishing management but also through experiments of semis of juveniles at various English Channel and Atlantic sites, to cite only the most applied operations. Fishing and shellfish farming professionals are closely associated with this programme. Scallop fishing occupies a prominent position this year in the press by reason of fishing and marketing problems due to intake being much higher than in past years. The situation matches the forecasts of IFREMER teams that have been... |
| Tipo: Text |
Palavras-chave: SEM. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/publication-2444.pdf |
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| Fleury, Pierre-gildas; Dao, Jean-claude; Mikolajunas, John-paul; Minchin, Daniel; Norman, Mark; Strand, Oivind. |
| Faced with the decline of scallop {Pecten maximus) fisheries and high costs of ongrowing in suspension, scallop seabed cultivation appeared to be the most suitable technique for European conditions. A three-year European Concerted Action supported by European Union and Norway (associated country) joined together four teams involved in scallop seedings : - IFREMER Brest / laboratory Molluscs, in Brittany (France), a national institute of ocean research (co-ordinator of the Concerted Action) ; - Connemara Shellfish Co-op, in Connemara, County of Galway (Ireland), a fishermen's co-operative ; - Seafish Ardtoe, in Scotland (United Kingdom), an institute provided by the fishing industry ; - Institute of Marine Research, in Bergen (Norway), a national institute... |
| Tipo: Text |
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| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/rapport-2451.pdf |
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| Dao, Jean-claude; Paquotte, Philippe. |
| La production mondiale (DAO, 1993) est de l'ordre de 1.000.000 tonnes (animaux entiers avec la coquille), dominé maintenant par le Japon (400.000 tonnes, aquaculture), la Chine (150.000 tonnes, aquaculture), le Canada/USA (200.000 tonnes, pêches sur 2 gisements). Les autres pays ont une contribution plus modeste reposant sur la pêche (Australie, France/UK, Pérou, Norvège/lslande, Méxique), en général à la limite de la surexploitation. Quelques nouveaux producteurs apparaissent du fait du succès de leurs programmes d'aquaculture (Nouvelle Zélande, Chili). |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00080/19083/16678.pdf |
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| Laurec, A; Bard, François-xavier; Dao, Jean-claude; Branellec, Jean. |
| Since 1967, albacore fishermen have been involved in the studies on fishery, recording their observations in fishing logbooks. This work is conducted under the authority of the Interprofessional tuna committee and studies have been carried out from 1967 to 1969 driven by the late professor Postel, and then taken over in 1969 by the CNEXO. The fishery is exploited mainly by a fleet of 300 French tuna boats and 1 000 Spanish tuna boats using mobile lines and living bait. It occurs over the summer season, from June in an area comprised between the Gibraltar straight and the Azores Islands until the end of September along the Franco-Irish continental shelf. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/rapport-4948.PDF |
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| Buestel, Dominique; Dao, Jean-claude; Muller-feuga, A.. |
| King scallop production in Japan enjoys a wonderful evolution one would like to find in other exploited marine species. In the Bay of Mutsu, one of the main exploitation centres, the production went from 430 t in 1963 to 6 000 t in 1969 and to about 40 000 t in 1972. Responsible for this development is an original method of spat collection, supplying the suspended cultures and the seabed seedings: the animal biology is taken into account. During its juvenile stages, it looks for a substrate for its metamorphosis, gets a hold of it thanks to a byssus, and stays for a few months before developing its benthic animal behaviour. The trick is to provide the scallop with a support, isolated in a fine mesh bag through which larvae can go but where the young shell... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5982.pdf |
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| Dao, Jean-claude; Lacroix, Denis; Lagardere, J. P.; Mellon, Capucine; Veron, Gerard. |
| Ce second rapport d'étape fait le point sur le travail engagé depuis la réunion d'ouverture du 18 mai 1998. En premier lieu, il rappelle les principales observations et conclusions des deux premières réunions de travail. Il présente ensuite les principaux enseignements tirés de la récente mission du groupe de travail, centrée sur les Pertuis charentais. A la différence de la côte méditerranéenne, il n'y a pas, sur le littoral atlantique français, de récifs artificiels au sens traditionnel. Les seules structures immergées récentes sont des filières à moules en Charente. Ce rapport inclut une analyse des besoins budgétaires pour mener à bien la réflexion et l'élaboration du rapport final. Les annexes attestent des efforts tantôt théoriques, tantôt pratiques... |
| Tipo: Text |
Palavras-chave: Récifs artificiels; Repeuplement; Aménagement côtier. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00429/54053/55355.pdf |
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| Dao, Jean-claude; Caisey, Xavier. |
| Since 1973, spat collection bas been conducted by IFREMER in the bay of Brest. This collection aimed at providing juveniles of Pecten maximus (1973-77) and then Chlamys varia(1977-87) in order to improve the management of the fishing grounds of the two species. Since 1982, the efforts have been focussed on the P. maximus spat production through the hatchery/nursery systems and the intermediate culture. Juveniles are seeded above a minimum size to create an additional population. In parallel, the levels of spat yied/collector have been followed as a pre-recruit index. At present time, there is no increase of spat collection during 1985-1990. Moreover, the results rise up the question of water quality in the bay of Brest for this group apparently very... |
| Tipo: Text |
Palavras-chave: Pectinidés; Captage; Collecteurs; Rade de Brest; Scallop; Pectinids; Spat collection; Bay of Brest. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00108/21965/19560.pdf |
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| Dao, Jean-claude; Barret, Jean; Carval, Jean-pierre; Connan, Jean-paul; Corre, Christian; Devauchelle, Nicole; Fleury, Pierre-gildas; Laurent, Pascale; Mazuret, Michel; Miner, Philippe; Mingant, Christian; Muzellec, Marie-louise; Robert, Rene. |
| Aquaculture production of scallop has been identified by a series of technical operations during the past ten years programme under a partnership involving the fishermen organizations with regional and national grants. 3 million juveniles have been produced annually, giving a potential recapture by fishing of 100 to 120 tonnes 3 years later. Results in terms of technical and economical approach have pointed out the principal unknown factors responsable for high costs. 7he pilot programme aims to increase the production to reach a level of 5 million juveniles to support the fishery of the rade de Brest and induce new management of the resources. Two priorities were selected, control of the reproduction in the hatchery to obtain reliable larval and... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00044/15494/12860.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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| Fleury, Pierre-gildas; Carval, Jean-pierre; Muzellec, Marie-louise; Gerard, Andre; Barret, Jean; Cochard, Jean-claude; Dao, Jean-claude. |
| L'aquaculture et la pêche ne font pas toujours bon ménage : conflit pour les zones de production (élevages en mer), concurrence sur le marché (poisson d'élevage / poisson "sauvage"), et surtout conflit sur la gestion des stocks naturels de juvéniles, parfois exploités pour l'approvisionnement des élevages au détriment d'une production naturelle d'adultes pour le stock exploité par pêche (palourde du golfe du Morbihan, crevettes tropicales, etc). En d'autres cas les techniques d'élevage peuvent se révéler au contraire un outil précieux pour la gestion des stocks naturels, particulièrement pour des animaux plus ou moins sédentaires comme les Mollusques ou les Crustacés. Ici l'élevage des juvéniles va permettre de conforter le stock naturel des animaux... |
| Tipo: Text |
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| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-7308.pdf |
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| Buestel, Dominique; Dao, Jean-claude. |
| Two main conditions are necessary for the extensive culture of king scallop: 1.The getting of spats, 2.A good survival rate for these spats in their natural environment. These two criteria enable the definition of the technical standards giving way to an economic analysis. Until now, the only solution to a juvenile production is their collection in their natural environment, on high adult density deposits. At the time being, out of all the French deposits, that of Saint-Brieuc is the only one answering this characteristic. However, even in this case, spat collection has not yet reached the necessary reliability. Indeed, the amount of spat collected for a year will rely on two main factors: 1.The state of the brood stock, 2.The climatic conditions. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5275.pdf |
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| Registros recuperados: 35 | |
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