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| Registros recuperados: 11 | |
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| Kopp, Dorothee; Morandeau, Fabien; Mouchet, Maud; Vogel, Camille; Mehault, Sonia. |
| In the Bay of Biscay, the selective properties of otter trawls have mainly been studied with regard to single species. However, for bottom trawl multispecific fisheries targeting fish, it remains challenging to find a selective device capable of limiting catches of small individuals of several species without commercial losses. The present study focuses on an innovative technical solution to reduce catches of undersized individuals in a multispecies bottom trawl fishery in the Bay of Biscay. We tested a cylinder made of 100-mm diamond meshes turned at 90°, namely T90 inserted in the extension piece. We present the selectivity results obtained for six commercial species. This device allows the escape of small Solea solea, Trachurus trachurus and... |
| Tipo: Text |
Palavras-chave: Gear technology; Covered codend; Turned mesh; Escape; Discard ban. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00439/55026/56487.pdf |
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| Cariou, Thibault; Dubroca, Laurent; Vogel, Camille. |
| Estuaries are crucial ecosystems where human activities deeply affect numerous ecological functions. Here we present a survey dataset based on the monitoring of fish nursery grounds of the Seine estuary and eastern bay of Seine collected once a year using a beam trawl during three distinct periods (1995-2002, 2008–2010 and 2017–2019). The surveys happen at the start of autumn in order to maximize the catchability of juvenile fish. The beam trawl mainly targets benthic and demersal species on a study area that extends over 600 square kilometers. The dataset includes abundance and densities of 161 species for 634 hauls performed around 40 stations each year. These data can be used by fishery scientists and ecologists motivated by early life stages of... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75277/75542.pdf |
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| Mouchet, Maud; Poirson, Manon; Morandeau, Fabien; Vogel, Camille; Méhault, Sonia; Kopp, Dorothee. |
| Improving the selectivity of a fishing gear is one technical management measure to significantly reduce by-catch of non-commercial species or undersized individuals. The efficiency of selective device is mainly estimated by comparing species composition, the biomass and length spectrum of caught individuals and escapees while the functional traits of species are rarely accounted for. Using an innovative technical device to reduce catches of undersized individuals in a multispecific bottom trawl fishery in the Bay of Biscay, namely a T90 mesh cylinder, we measured functional traits on both caught and escaped individuals of 18 species. Using a Principal Component Analysis and K-means partitioning, we clustered species into 6 groups illustrating 6 different... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62330/66588.pdf |
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| Vogel, Camille; Kopp, Dorothee; Mehault, Sonia. |
| On January 1st, 2016, the French mixed Nephrops and hake fishery of the Grande Vasière, an area located in the Bay of Biscay, fell under the discard ban implemented as part of the new European Common Fisheries Policy. The fleet records historically high levels of discard despite numerous gear selectivity studies. Together with high discards survival, new technological solutions to minimize catches of undersized individuals could justify local exemptions from the discard ban. Our study focuses on the effects of two selective devices, a square mesh cylinder (SMC) and a grid, on the escapement of undersized individuals and discard reduction. Relative catch probability of the modified gear compared with the traditional gear was modelled using the catch... |
| Tipo: Text |
Palavras-chave: Nephrops; European hake; Discard ban; Gear technology; Catch comparison; Selectivity. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00356/46717/46906.pdf |
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| Vogel, Camille; Kopp, Dorothee; Morandeau, Fabien; Morfin, Marie; Mehault, Sonia. |
| In the English Channel and Southern Bight, French demersal trawlers target a mix of demersal species including whiting (Merlangius merlangus). The discard ban to be implemented in January 2016 motivated fishermen to look for technical measures to reduce unwanted catches of undersized individuals (<27 cm). From 2008–2014, 18 different gear configurations were tested for bycatch reduction on board fleets of vessels of 16–20 m and 20–24 m. Selective devices tested included grids, square mesh panels (SMP), square mesh cylinders (SMC), various combinations of these devices and large mesh trawls. Using the catch comparison method, our results focus on six devices that proved efficient to reduce catches of undersized whiting, equally divided between the two... |
| Tipo: Text |
Palavras-chave: Square mesh; Sorting grids; Fishing gear technology; Merlangius merlangus; Catch comparison; GLMM. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00384/49553/50079.pdf |
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| Vogel, Camille. |
| Ce rapport a été rédigé dans le cadre de la convention cadre Ifremer/DPMA 2013-2016 portant sur la sélectivité des engins de pêche (Réf Ifremer n°13/1210867/NF). Il s’agit d’une synthèse bibliographique des travaux de sélectivité réalisés en France pour l’ensemble des engins de pêche utilisés sur les façades Manche-mer du Nord, Atlantique et Méditerranée. La littérature internationale a été consultée pour enrichir la réflexion autour de la sélectivité des engins de pêche et mettre en perspective les résultats obtenus à l’échelle française. Ce rapport ne traite pas des espèces interdites à la pêche, ni des captures accidentelles de cétacés ou de tortues. Le rapport se concentre sur les aspects techniques de la sélectivité, sans considération pour les... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00317/42869/42327.pdf |
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| Cariou, Thibault; Dubroca, Laurent; Vogel, Camille; Bez, Nicolas. |
| L’estuaire de Seine est un habitat essentiel pour les espèces halieutiques emblématiques de la façade Manche-Mer du Nord en sa qualité de nourricerie. Cet estuaire a connu de profondes modifications morphologiques au cours des 30 dernières années des suites d’une forte anthropisation de ces rives. Cet habitat estuarien-côtier, comptant parmi les habitats les plus productifs du milieu marin, joue un rôle central dans le renouvellement des stocks de pêche, en favorisant la croissance et la survie des juvéniles des espèces dites « nourricerie-dépendantes ». Malgré une couverture temporelle très inégale dans les campagnes depuis 30 ans, les suivis des communautés de juvéniles et les observations biotiques (communautés benthiques), abiotiques (hydrodynamisme,... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62355/66632.pdf |
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| Vandemark, D; Mourad, Pd; Bailey, Sa; Crawford, Tl; Vogel, Camille; Sun, J; Chapron, Bertrand. |
| A research aircraft was recently flown over the Mid-Atlantic Eight during a mild cold air outbreak to sample the planetary boundary layer at low levels of 15-20 m above the sea surface. Aircraft sensors measured near-surface atmospheric turbulence and, at the same time, variations in sea surface roughness using laser and radar. The aircraft turbulence observations indicate a coherent secondary flow consistent with boundary layer roll vortices of crosswind scale 1.5-2.0 km. Modulation in measured laser and radar-inferred sea surface slope variance occurs at similar scales. Remarkable correlation is found between the radar backscatter and near-surface wind speed data, showing that the short wave slope variance is responsive to these large eddies. Associated... |
| Tipo: Text |
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| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00000/10364/9498.pdf |
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| Registros recuperados: 11 | |
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