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| Registros recuperados: 58 | |
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| Priour, Daniel; Khaled, Ramez. |
| Trawls energy efficiency is greatly affected by the drag, as well as by the swept area. The drag results in an increase of the energy consumption and the sweeping influences the catch. Methods of optimisation of the trawl design have been developed in order to reduce the volume of carburant per kg of caught fish and consequently the drag per swept area of the trawl. Based on a finite element method model for flexible netting structures, the tool modifies step by step a reference design. For each step the best-modified design, in terms of drag per swept area is kept. Such optimisation can lead to a decrease of the drag or an increase of the swept area. In the second case, that could lead to an increase of fishing effort. To avoid such increase, which could... |
| Tipo: Text |
Palavras-chave: Fishing; Fuel; Fishing gear; Trawl; Optimisation; Fishing effort. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00170/28151/26381.pdf |
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| Bouhoubeiny, Elkhadim; Germain, Gregory; Druault, Philippe. |
| Flow field measurements past a fixed rigid cod-end structure and past a porous fishing net structure are conducted using Time-Resolved PIV method. The rigid cod-end is first used to characterize finely the wake flow. Proper Orthogonal Decomposition (POD) is then applied in order to extract the large scale energetic vortices of the flow from the measured velocity field. It is then observed that the first POD modes are associated to the Karman's type flow structure of vortex shedding. It is shown that the characteristics of the wake flow behind the rigid cod-end flow configuration compare quite well with previous ones obtained from bluff cylinder or sphere wake analyzes. Second, PIV measurements are performed around a non-rigid bottom trawl which is free to... |
| Tipo: Text |
Palavras-chave: Fishing gear; PIV measurements; Vortex shedding; Proper Orthogonal Decomposition. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00027/13820/11046.pdf |
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| Pasquaud, Stephanie; Brind'Amour, Anik; Berthele, Olivier; Girardin, Michel; Elie, Pierre; Boet, Philippe; Lepage, Mario. |
| In view of the European Union (EU) requirements to diagnose and monitor the ecological status of estuarine ecosystems using fish-based indicators, we assessed the effect of the sampling protocol in meeting these objectives. Using three different sampling surveys, we evaluated the impact of four components, i.e. sampling gear, spatial extent, length of time series and temporal window analysed, on the detection of ecological trends in the Gironde estuary, estimated by different types of fish-based indicator. For each component, temporal trends of several fish-based indicators were analysed and for the final diagnosis these temporal trends were combined. The results showed that sampling gear had significant effects on the assessment of ecological trends, as... |
| Tipo: Text |
Palavras-chave: Protocol effects; Fishing gear; Ecological trend; Fish; Indicators; Estuarine ecosystem. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00049/15976/14533.pdf |
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| Flament, Margaux; Monet, Nans; Pau, Cedric; Reynal, Lionel. |
| In the West Indies, artisanal vessels target pelagic fish off the coast using several fishing gears in the same trip, which complicates their codification based on ICCAT references. This paper describes the fishing techniques used in Martinique in exploiting offshore pelagic species. A distinction is made between two métiers, fishing for large pelagic species on free schools or around driftwood and fishing close to anchored fish aggregating devices. These two métiers can be used in the same trip. Fishers can also suspend their use to catch small offshore pelagic species such as flying fish. Each gear enables a species group to be targeted. However, data collection carried out at landing sites does not allow assignment of catches to each of the gears used... |
| Tipo: Text |
Palavras-chave: Martinique; Pelagic fisheries; Fishing gear; Fishing effort. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00418/52983/53921.pdf |
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| Gobert, Bertrand. |
| The foreign artisanal fishery of Pointe-Noire (Congo) significantly evolved since its beginning, in the 1950s, by the number of fishermen and canoes, as well as the fishing techniques used and by its socio-economic organization. The fishery for Sardinella by surface gill-nets, its main activity, is based on common ownership and savings, thus allowing partial reinvestment of fishing revenues, the riskier (such as bottom gill-net) being left to individual initiatives. The foreign fishery employs many Congolese fishermen, in a permanent or very occasional way. However no improvement effect seems to have taken place in favor of the local artisanal fishery. |
| Tipo: Text |
Palavras-chave: Clupeidae; Pisces; Sardinella; Fishery economics; Fishing gear; Artisanal fishing. |
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/1983/publication-1829.pdf |
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| Berthou, Patrick; Daures, Fabienne; Guyader, Olivier; Merrien, Claude; Jezequel, Michele. |
| This summary of the French fisheries of the North Sea/English Channel/Atlantic for the year 2000 is done in the context of the programme "Halieutic Information Systems" that has as its goal the creation of a permanent and operational observatory of fishing. It brings together several types of data: statistical data of administrative origin, data from the IFREMER pollsters network, economic data and data acquired during sea campaigns. This first annual summary of French fisheries, meant for all actors in the fishing industry (from research to professionals and managers) and the general public, is limited to the Atlantic coast. The first part of this document contains an overall description of the English Channel Atlantic fleet, that is, all trades included.... |
| Tipo: Text |
Palavras-chave: Fishing gear; French fisheries; Fishing fleet; Species; Metier; Atlantic Ocean; Channel; North Sea; Pêcheries françaises; Flottille de pêche; Engins de pêche; Espèces; Métier; Atlantique; Manche; Mer du Nord. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/rapport-2629.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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| Biais, Gerard; Taquet, Marc. |
| The authors deal with the coastal fisheries in the Reunion Island. In a first chapter they describe the geographical environment of this island (volcanism, climate, cyclones, hydrology, currents water masses) which has an influence on fisheries results. The second and third chapter describe the commercial species of the Reunion island (pelagic fishes: Scombridae as Thunnus albacares, Katsunonus pelamis, Euthynnus affinis, Thunnus obesus, Gymnosarda unicolor, Thunnus alalunga, other fishes as Xiphias gladius, Makaira mazara, Istiophorus platypterus. The fourth chapter deals with the fishing gears and the catching methods. The fifth chapter is devoted to fishery economics, financing |
| Tipo: Text |
Palavras-chave: Winds; Climate; Catching methods; Fishery economics; Pelagic fisheries; Fishing gear; Fishing vessels; Fishing. |
| Ano: 1992 |
URL: https://archimer.ifremer.fr/doc/1992/rapport-1455.pdf |
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| Registros recuperados: 58 | |
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