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| Theret, Francois. |
| La détermination des formes et tensions d'une structure souple réticulée en équilibre dans un courant uniforme est un problème complexe. Dans cette étude, la structure considérée est un chalut dont seul le plan de coupe est, a priori, connu. La méthode itérative proposée permet de calculer les efforts hydrodynamiques exercés sur les côtés des mailles et la forme d'équilibre prise par le filet. Les difficultés de cette étude sont de trois ordres: - le comportement hydrodynamique des mailles de filet est mal connu. - un chalut est une structure infiniment souple qui n'a pas de forme propre, seule l'action des forces extérieures lui permet de prendre une certaine configuration. Mais ces forces dépendent elles-mêmes de la forme prise par le filet; nous devons... |
| Tipo: Text |
Palavras-chave: Efforts hydrodynamique; Panneau; Filet; Surface souple; Structure; Couplage fluide structure; Surface réticulée; Maille; Chalut. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/these-6930.pdf |
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| Le Gall, Yves; Origne, Laurent; Scalabrin, Carla; Morizur, Yvon. |
| Acoustic deterrent devices could be an appealing solution to tackle accidental cetacean by-catches in pelagic trawls or in fishing net gears. The bibliographical data on two species (Harbour porpoise and bottlenosed dolphin) have been analyzed in terms of audiogram, discomfort noise level that could lead to behavioural changes, sensory fatigue, and threshold for permanent hearing injuries. It is possible, on the basis of the above data, to characterize an efficient annoyance sound threshold which is not harmful to the species to be protected. Taking into account the properties of the sound waves propagation in the marine environment and according to the required range, the minimal amplitude of the repulsive sound to emit is proposed. Accordingly, the... |
| Tipo: Text |
Palavras-chave: Wave propagation; Behaviour; Audiogram; Capture; Cetacean; In fishing net gear; Pelagic trawl; Acoustic deterrent; Propagation onde; Comportement; Audiogramme; Capture; Cétacé; Filet; Pêche artisanale; Chalutage pélagique; Répulsif acoustique. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-1124.pdf |
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| Guillou, Alain. |
| A series of experimental fishing stations by means of bottom trarnmelnets have been conducted on the slopeof Martinique between 100 and 300 mn depth from november 1986 to march 1988, as part of a program entitled «Antillean Fisheries study» of the Pôle de Recherche Oceanologique et Halieutique Caraïbe». The species composition of the catches and the length frequencies of the potential commercial species, with a detailed analysis of their yields according to the depth and to the geographie localization are given. The whole average yield reaches 20 to 25 kg, two thirds of sharks, for 100 rn trarnmelnet set during approximately twenty hours. Furthennore, the main technical, commercial and human problems which are necessarily to be integrated and elucidated... |
| Tipo: Text |
Palavras-chave: Pêcherie artisanale; Martinique; Evaluation; Ressources; Filet; Trémail; Talus; Analyse capture; Rendements. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/00455/56655/58397.pdf |
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| Talidec, Catherine; Berthou, Patrick; Peronnet, Isabelle; Guyader, Olivier; Daures, Fabienne; Thebaud, Olivier; Leblond, Emilie; Bermell, Sylvain. |
| This 2002 report is the progress report of a study co-financed by the Brittany region and IFREMER within the framework of the XII State-Regional Planning Contract. It follows the 2001 report, which contains a comprehensive description of the Breton fleet in 2000, i.e., all occupations included, as well as its evolution since 1983. The work carried out in 2002 focused on mapping the fishing zones frequented by Brittany's ships as well as on analysing fishing strategies. |
| Tipo: Text |
Palavras-chave: Fishing gear; Regional development; Cartography; Fleet; Breton fisheries; Brittany; Cartographie; CPER 2002; Peche bretonne; Flotte; Casier; Ligne; Drague; Palangre; Filet; Chalut. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/rapport-2259.pdf |
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