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| Registros recuperados: 22 | |
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| Robert, Marianne; Cortay, Aurore; Morfin, Marie; Simon, Julien; Morandeau, Fabien; Deneubourg, Jean Louis; Vincent, Benoit. |
| Knowledge about fish behavior is crucial to be able to influence the capture process and catch species composition. The rapid expansion of the use of underwater cameras has facilitated unprecedented opportunities for studying the behavior of species interacting with fishing gears in their natural environment. This technological advance would greatly benefit from the parallel development of dedicated methodologies accounting for right-censored observations and variable observation periods between individuals related to instrumental, environmental and behavioral events. In this paper we proposed a methodological framework, based on a parametric Weibull mixture model, to describe the process of escapement attempts through time, test effects of covariates and... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00663/77553/79457.pdf |
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| Vincent, Benoit. |
| IFREMER and ECN have been working together for almost ten years on problems related to the numerical simulation of trawls and more generally the numerical simulation of any kind of fishing gear. To develop such a simulation tool, we need to build (i) a software in which all the parameters of the fishing gear are taken into account; (ii) a software that computes the physical behaviour of the fishing gear (static or dynamic); (iii) a software to visualise the results of calculations. The most complex part of this work most of the time rests in the point (i), because of the huge amount of parameters and elements of an actual fishing net. We have already developed a tool (point (i), named Cachalot) to describe a trawl. However, this software was designed to... |
| Tipo: Text |
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| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00639/75159/75298.pdf |
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| Mnassri, Ilyes; Le Touze, David; Vincent, Benoit; Alessandrini, Bertrand. |
| The present work investigates an application-oriented issue in the marine and fisheries researches domain. However much trawl structure codes that simulate dynamic behavior of submerged nets, in continuous interaction with surrounded ocean water, still need more accuracy and precision due to the fact that the sea water is mainly considered as a fluid with a uniform velocity and intensity, and so the effects of small turbulence rates were neglected. When this little inaccuracy occurs in the first step of the net displacement prediction, a large error could manifests in the form of the simulated net, and as consequence, drag forces wrongly estimated. In the purpose to overcome the lack of data information exchange during the fluid structure interaction, a co... |
| Tipo: Text |
Palavras-chave: Net deployment; Navier-Stokes; Tait EOS; Riemann solver. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00127/23834/21759.pdf |
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| Germain, Gregory; Priour, Daniel; Vincent, Benoit; Billard, Jean-yves; Druault, Philippe; Bouhoubeiny, Elkhadim; Alexandrini, Bertrand; Le Touze, David; Khaled, Ramez; Mnassri, Ilyes. |
| Le comportement hydrodynamique des structures poreuses utilisées pour la pêche (chaluts, nasses, cages, seines) est aujourd’hui encore mal connu. Les chaluts étant responsables de la plus grosse part de la consommation de fuel en action de pêche, ce projet a pour objectif de développer un outil de conception de chalut permettant de réduire au maximum la traînée de l’engin.L’outil ainsi développé devrait permettre d’obtenir un gain de l’ordre de 20% sur la traînée d’un chalut, tout en conservant une efficacité en pêche comparable. Les développements réalisés pourront également être étendus pour étudier les différents types de structures poreuses utilisées pour la pêche et mieux appréhender le développement de dispositifs de sélectivité. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00116/22716/20683.pdf |
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| Vincent, Benoit; Di Cesare, Noëlie; Simon, Julien. |
| The assessment of mesh resistance to opening is a key factor when coming to fishing gear design to study or optimize the fishing selectivity process. Different authors proposed methodologies to achieve twine flexural rigidity identification and mesh opening angle at rest. Their experimental protocols could rely on complex installations and instrumentation, and identification needs dedicated models or software with possible important set up time. Sometimes, different flexural rigidity and rest angle values for a given netting type were proposed depending on identification or experimental conditions, leading to difficulties to choose a value for implementation in netting structures simulation software. The new methodology proposed in this article is based on... |
| Tipo: Text |
Palavras-chave: Fishing net mechanics; Twine flexural rigidity; Numerical simulation; Selectivity; Fishing. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00613/72541/71615.pdf |
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| Person, Jeannine; Buchet, Vincent; Vincent, Benoit; Le Delliou, Herve; Quemener, Loic. |
| Growth of juvenile pollack was assessed at five constant temperatures (9, 12, 15, 18 and 21 degrees C) in an 84-day trial. Duplicate groups of 75 fish (initial weight 143 +/- 2 g) were held in O-2 saturated water (102-103% saturation) and fed to apparent satiation. Growth increased as temperature increased from 9 degrees C up to a plateau at 12-15 degrees C (NS differences between 12 and 15 degrees C) followed by a decrease from 18 degrees C. No growth occurred at 21 degrees C. For the overall period, specific growth rates were 0.52% and 0.53% day(-1) at 12 and 15 degrees C compared to 0.40% day(-1) at 18 degrees C. Feed intake was maximum at 15-18 degrees C (0.68-0.69% day(-1)) and it was significantly lower at 21 degrees C (0.45% day(-1)). Apparent feed... |
| Tipo: Text |
Palavras-chave: Feed efficiency; Growth; Temperature; Pollack. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1122.pdf |
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| Vincent, Benoit. |
| We present a numerical method for solving the turbulent, steady, incompressible, internal and external flow to a permeable axisymetric surface. This surface is placed in a uniform flow parallel to its axis. This method is based on the Navier - Stokes equations. Closure of the equations is realised by the K-epsilon turbulence model with specific conditions at the permeable surface. The model for the normal velocity component at the permeable surface is the Darcy equation. Tangential velocity component is given by the Saffman equation witch is modified. The second part is an experimental study of velocities and turbulence rates for axisymetric models (cylinders and cones). Comparison between calculation and experimental results shows that hypothesis are... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00292/40300/38749.pdf |
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| Mengual, Baptiste; Cayocca, Florence; Le Hir, Pierre; Draye, Robin; Laffargue, Pascal; Vincent, Benoit; Garlan, Thierry. |
| Sea trials were performed on two zones with different fishing efforts on the continental shelf of the Bay of Biscay ('Grande-VasiSre' area of muddy sand) in order to assess particulate matter resuspension and seabed disturbances (i.e., penetration, reworking, grain size changes) induced by different types of trawls. Optical and acoustic measurements made in the water column indicate a significant trawling-induced resuspension mainly due to the scraping action of doors. It manifests as a highly dynamic turbid plume confined near the seabed, where suspended sediment concentrations can reach 200 mg l(-1). Concentration levels measured behind an "alternative" configuration (trawls with jumper doors instead of classical doors penetrating the sediment) are... |
| Tipo: Text |
Palavras-chave: Bottom trawling; Sedimentresuspension; Seabed disturbance; Erosion flux; Bay of Biscay. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00353/46428/51396.pdf |
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| Vincent, Benoit; Simon, Julien; Vacherot, Jean-philippe; Morandeau, Fabien; Larnaud, Pascal; Kopp, Dorothee; Mehault, Sonia; Morfin, Marie; Savina-rolland, Marie; Marc, Emilie. |
| The Lorient flume tank is an hydrodynamic facility available for any qualification and observation of submerged objects in still or moving water. It is a closed loop circulating tank filled with fresh water. The fluid is moved with a 70 kW pump-motor with a velocity between 0 and 1 m/s and homogenized with a series of pressure drop systems. The overall dimensions are 24.50 m long, 7.50m wide and 3.30 m high. The part where experiments can be set up is 12m long, 2.6 m wide and 1.5 m deep. A mobile bottom belt can be synchronized with the water flow velocity and enables to simulate the seabed velocity relatively to a towed object. The overall process of the facility is controlled by a user friendly interface. |
| Tipo: Text |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00436/54803/56299.pdf |
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| Theret, François; Vincent, Benoit; Lorance, Pascal; Meillat, Marc; Mehault, Sonia; Jarry, Etienne; Comparini, Charline. |
| This report presents the results of laboratory developments, field experiments and data analyses carried out in the contract MARE/2011/07 - "Studies on the Common Fisheries Policy" - Lot 1 "Reduction of gear impact and discards in deep sea fisheries". The contractual objectives were "(I) to identify and study trawl modification and alternative gear that aim at reducing the impact of the gear on the sea bottom when engaged in deep-sea fisheries, and (II) to identify and study a measure for discard reduction in deep-sea fisheries or fisheries having deep-sea species as a by-catch, pursued with trawls or nets. The measure could consist in gear modifications or catch purification based on the skipper’s strategy to avoid unwanted fish." |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00226/33744/32157.pdf |
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| Robin, Jean; Vincent, Benoit. |
| Recent advances have led to the development of inert diets for first-feeding marine fish larvae. The purpose of the present study was to evaluate fatty acid (FA) incorporation into larva using practical-type and semipurified diets as first food for larvae. Experimental microparticulate diets were fed to gilthead sea bream larvae, right from the mouth opening to day 21 post hatching. Five basal diets were compared, using fish meat or casein as main protein sources, and fish protein concentrate or casein hydrolysates and algae powder (Schizochytrium). Diets contained soybean lecithin to provide polar lipids and this also provided a high linoleic acid (18:2n-6) content. n-3 HUFA (1.5-1.7% DM) were mainly in dietary neutral lipids, with a part in polar lipids... |
| Tipo: Text |
Palavras-chave: Sparus aurata; Inert diet; Fatty acids; Larva; Fish. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-499.pdf |
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| Vincent, Benoit; Vacherot, Jean-philippe; Dagorn, Michel; Leroy, Yvon; Gamblin, Caroline. |
| Le projet Jumper a été déposé en réponse à l’appel d’offre de France Filière Pêche (FFP) de mai 2012. Il se base sur une proposition de l’ANOP et de l’UAPF. Le projet est porté par le CNPMEM en partenariat avec l’Ifremer, les établissements Morgère et l’IMP. Il a été labellisé par le Pôle Mer Bretagne Atlantique fin 2012. Le calendrier prévisionnel prévoyait que les travaux soient réalisés du 1er janvier 2013 au 30 juin 2014. Un avenant a permis de les poursuivre jusqu’à fin 2014 et d’organiser la restitution début 2015. L’objectif du projet était d’optimiser un panneau de chalut, préalablement mis au point, appelé « Jumper » moins impactant sur les fonds marins et permettant des économies d’énergie. Cette optimisation concernait la facilitation de... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00292/40290/38723.pdf |
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| Vold, Aud; Breen, Michael; Hansen, Kurt; Vincent, Benoit; Zachariassen, Kristian. |
| The final research cruise described in this report had the objective to compare the physical and biological impact of the bottom trawl modifications developed during the EU DEGREE project to a standard bottom trawl used in the Barents Sea cod fisheries. The “new” trawl was fitted with the last modification of the plate gear developed during the project as well as trawl doors (standard Thyborøn doors) rigged to barely touch the bottom. The commercial trawl used for comparison was rigged with a conventional rockhopper ground gear and the doors were rigged to go heavy on the bottom as normally rigged during commercial bottom trawling. We looked for combinations enabling us to fish with the doors off, or nearly off, the bottom, while the ground gear was still... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00225/33616/32016.pdf |
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| Vincent, Benoit; Huse, Ingvar; Huse, Irene; Maravelias, Christos. |
| The trawls used to sample demersal fish are normally slightly modified commercial fish or shrimp trawls. Such trawls are designed to capture commercial species, and do not lend themselves well to representative sampling, mainly due to the herding effect of trawl doors, sweeps and bridles. The impact of herding is different on different species and size groups of the same species, and both inter- and intra-specific effects can be quite large. The SURVEYTRAWL project intends to provide the strategic basis and initial design for a new survey trawl, which will represent a good compromise in terms of being non-herding and non-selective, and with stable and consistent operation. The final objective is to produce a new trawl with the characteristics of a beam... |
| Tipo: Text |
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| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00629/74117/73557.pdf |
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| Registros recuperados: 22 | |
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