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Registros recuperados: 21
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A bio-economic analysis of experimental selective devices in the Norway lobster (Nephrops norvegicus) fishery in the Bay of Biscay ArchiMer
Raveau, Adriana; Macher, Claire; Mehault, Sonia; Merzereaud, Mathieu; Le Grand, Christelle; Guyader, Olivier; Bertignac, Michel; Fifas, Spyros; Guillen Garcia, Jordi.
Several fleets with various fishing strategies operate as a mixed fishery in the Bay of Biscay. Among the main fleets, bottom trawlers target Norway lobster (Nephrops norvegicus) and, together with gillnetters, they also catch hake (Merluccius merluccius). Trawling leads to average-size catches that are below the minimum landing size (MLS); such catches are discarded since they cannot be sold. These discards result in negative impacts on stock renewal, as most of them do not survive. This also results in an economic loss for both bottom trawlers and gillnetters since these discards represent a future loss of rent. This study, based on the 2009 and 2010 selectivity experiments at sea, assesses the short- and long-term bio-economic impacts of four...
Tipo: Text Palavras-chave: Demersal trawl fishery; Bio-economic analysis; Selectivity; Simulation; Selective device; Nephrops norvegicus; Merluccius merluccius; Atlantic Ocean.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00110/22135/19774.pdf
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Activité et production des navires français – Façade "Manche est" et Façade "Loire-Gironde" ArchiMer
Delpech, Jean-paul; Mehault, Sonia; Rostiaux, Emilie; Leaute, Jean-pierre; Leblond, Emilie; Demaneche, Sebastien; Coppin, Franck; Mahe, Kelig; Vaz, Sandrine.
This report is a result of a contract between Ifremer and the French Ministry of Industry. The aim was to provide map the fisheries activity and landings for french fishing vessels, located in the Eastern Channel and the Bay of Biscay during the year 2005. Two areas have been selected: - the "Eastern Channel" area, including 7 administrative departments : Nord, Pas-de-Calais, Somme, Seine-Maritime, Eure, Calvados and Manche. - the "Loire-Gironde" area, including 4 administrative departments : Loire-Atlantique, Vendée, Charente-Maritime and Gironde.
Tipo: Text Palavras-chave: Fishing fleets; Fishing gears; Bay of Biscay; Eastern Channel; Mapping; Landings; Fisheries activity; Flottilles; Pêche; Engins; Golfe de Gascogne; Manche est; Cartographie; Production; Activité halieutique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-6645.pdf
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Are trawl marks a good indicator of trawling pressure in muddy sand fishing grounds? ArchiMer
Merillet, Laurene; Kopp, Dorothee; Robert, Marianne; Salaun, Michele; Mehault, Sonia; Bourillet, Jean-francois; Mouchet, Maud.
The development of the vessel monitoring system (VMS) in the recent years has offered high-resolution data to map the distribution and intensity of fishing activities and contributed to enhancing the potential identification of fishing impacts. However, impacts could vary at very small scale and the resolution of VMS data might not be fine enough. Other proxy could be used, such as trawl marks visible on the seabed observed by underwater video or side-scan sonar to evaluate small-scale trawling effort. In the Bay of Biscay, an underwater video survey of the Nephrops norvegicus fishing ground was conducted and provided environmental characteristics such as depth and number of trawl marks at 152 transects. The relevance of observed trawl marks as a...
Tipo: Text Palavras-chave: Bay of Biscay; Fishing intensity; Sediments; Underwater video; Vessel monitoring system.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00410/52112/52854.pdf
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Direct assessment of anchovy by the Pelgas06 acoustic survey ArchiMer
Masse, Jacques; Mehault, Sonia; Beillois, Pierre; Duhamel, Erwan; Planque, Benjamin; Petitgas, Pierre; Biseau, Alain.
An acoustic survey was carried out in the bay of Biscay from May 1st to May 30th on board the French research vessel Thalassa. The objective of PELGAS06 survey was to study the abundance and distribution of pelagic fish in the Bay of Biscay. The target species were mainly anchovy and sardine and were considered in a multi-specific context. The results have to be used during ICES working groups in charge of the assessment of sardine, anchovy, mackerel and horse mackerel and in the frame of the Ifremer fisheries ecology program "resources variability"
Tipo: Text Palavras-chave: Bay of Biscay; Plakton net; Trawl; CUFES; Survey; Acoustic; ICES; PELGAS; Anchovy; Golfe de Gascogne; Filet à plancton; Chalut; CUFES; Campagne; Acoustique; CIEM; PELGAS; Anchois.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-2291.pdf
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Essais de dispositifs sélectifs par les flottilles chalutières du golfe de Gascogne. Programme REDRESSE ArchiMer
Mehault, Sonia; Larnaud, Pascal; Rimaud, Thomas; Cuillandre, Jean-pierre; Morandeau, Fabien; Simon, Julien; Vacherot, Jean-philippe.
The landing obligation implemented under the Common Fisheries Policy promoted the development of fishing gear selective devices. The REDRESSE project conducted in the Bay of Biscay was the opportunity for trawl fleets targeting cephalopods, Nephrops and demersal fish to continue to test various selective configurations to reduce their discards levels. The sea trials were carried out onboard of commercial fishing vessels and the experimental tows were sampled by an observer. Most of the selective devices were tested under the twin trawl method, with on one side the gear to be tested and on the other, the standard commercial gear. Other devices were tested with the parallel or alternate haul method. The data obtained were used to describe the catch species...
Tipo: Text Palavras-chave: Pêcherie langoustinière; Pêcherie poisons/céphalopode; Grande Vasière; Golfe de Gascogne; Sélectivité; Chalut; Rejets; Nephrops fishery; Fish/cephalopods fishery; Grande Vasière; Bay of Biscay; Trawl selectivity; Discards.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00457/56847/58681.pdf
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Evaluation des ressources halieutiques par les campagnes scientifiques françaises - Façade "Manche est" et façade "Loire-Gironde" ArchiMer
Delpech, Jean-paul; Mahe, Kelig; Mehault, Sonia; Rostiaux, Emilie; Biais, Gerard; Coppin, Franck; Vaz, Sandrine.
This report is a result of a contract between Ifremer and the French Ministry of Industry. The aim was to map the distribution of the fisheries resources from french scientific surveys. Two areas have been selected: - the "Eastern Channel" area, including 7 administrative departments : Nord, Pas-de-Calais, Somme, Seine-Maritime, Eure, Calvados and Manche. - the "Loire-Gironde" area, including 4 administrative departments : Loire-Atlantique, Vendée, Charente-Maritime and Gironde.
Tipo: Text Palavras-chave: Bay of Biscay; Eastern Channel; Juvenile; Adult; Abundance index; Specific richness; Mapping; Fisheries; Scientific survey; Golfe de Gascogne; Manche est; Juvénile; Adulte; Indice d'abondance; Richesse spécifique; Cartographie; Campagne halieutique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-6642.pdf
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Evaluation du taux de survie des captures indésirées de langoustines "Nephrops norvegicus" pêchées au chalut de fond dans le golfe de Gascocgne ArchiMer
Merillet, Laurene; Kopp, Dorothee; Morandeau, Fabien; Mehault, Sonia; Rimaud, Thomas; Piton, C.
In the context of the reform of the Common Fishing Policy (CFP) undertaken by the European Union and implemented since 1st January 2014, the discarding of unwanted catches will gradually be forbidden. Article 15 of the CFP lays down a landing obligation for all species subject to European quotas and will come into force between 2015 and 2019 according to the species and the zones. The Regulation allows several exemptions including one for "species for which scientific proof shows high survival rates, due to the characteristics of the fishing gear, the fishing methods and the ecosystem" (EU Regulation No. 1380/2013). In particular, Nephrops were identified by the International Council for the Exploration of the Sea (ICES) as one of the species having the...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00378/48953/49357.pdf
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From discard ban to exemption: How can gear technology help reduce catches of undersized Nephrops and hake in the Bay of Biscay trawling fleet? ArchiMer
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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Impact of egg production and stock structure on MSY reference points and its management implications for southern hake (Merluccius merluccius) ArchiMer
Cervino, Santiago; Dominguez-petit, Rosario; Jardim, Ernesto; Mehault, Sonia; Pineiro, Carmen; Saborido-rey, Fran.
Spawning stock biomass (SSB) is one of the most common measures of stock status. However recent research on reproductive potential has shown that alternative variables may be an improvement over SSB. In the case of European hake (Merluccius merluccius), it is known that large individuals produce more eggs by unit of body weight, and their quality is better than those of small individuals. Under these circumstances, application of reproductive potential may be pertinent in the implementation of the Johannesburg agreement, since it is not only the spawning biomass but also its age or length structure that defines stock productivity and its ability to achieve maximum sustainable yield (MSY). In this contribution we used an age-length structured population...
Tipo: Text Palavras-chave: Egg production; Biological reference points; Steepness; Length based models; Hake.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00161/27254/25487.pdf
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Improving gear selectivity of whiting ( Merlangius merlangus ) on board French demersal trawlers in the English Channel and North Sea ArchiMer
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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Informations sur les améliorations de la sélectivité des espèces/engins visés par les exemptions de minimis ArchiMer
Larnaud, Pascal; Mehault, Sonia; Morandeau, Fabien.
Ce travail vise à évaluer les possibilités d’amélioration de la sélectivité pour les espèces / engins /zones visées par les exemptions de minimis (annexe 1), en fonction des données bibliographiques ou de résultats d’études.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00506/61730/65708.pdf
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Informations sur les taux de survie des rejets ArchiMer
Mehault, Sonia; Kopp, Dorothee; Morfin, Marie.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00506/61731/65710.pdf
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Lorient Flume tank ArchiMer
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
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00436/54803/56299.pdf
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Lot 1: Reduction of gear impact and discards in deep sea fisheries. Final report ArchiMer
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."
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00226/33744/32157.pdf
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Narrowing down the number of species requiring detailed study as candidates for the EU Common Fisheries Policy discard ban ArchiMer
Morfin, Marie; Mehault, Sonia; Benoit, Hugues P.; Kopp, Dorothee.
By 2019, the Common Fisheries Policy will prohibit discarding in all European fisheries of any pelagic, demersal or shellfish species for which removals are managed by TACs and quotas or minimum sizes. However, the regulation allows for exemptions from the prohibition for species for which scientific evidence demonstrates high survival rates associated with discarding. Producing reliable evidence of high survival typically requires long and costly studies involving tagging or captivity. This paper proposes to use the capacity to resist air exposure, a key stressor for discarded animals, as a proxy for survival that can be used to prioritize candidate species for more in-depth discard survival studies. The time required to induce mortality (TM) in...
Tipo: Text Palavras-chave: Landing obligation; Discard mortality; Hypoxia; Artisanal bottom trawl fishery; Bay of Biscay; English Channel.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00362/47281/49145.pdf
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Report on assessing trawling impact in regional seas ArchiMer
Nielsen, J. Rasmus; Bastardie, Francois; Buhl-mortensen, Lene; Eigaard, Ole; Gümüs, Aysun; Hintzen, Niels T.; Kavadas, Stefanos; Laffargue, Pascal; Mehault, Sonia; Notti, Emilio; Papadoupoulou, Nadia; Polet, Hans; Reid, David; Rijnsdorp, Adriaan D.; Rochet, Marie-joelle; Robert, Alexandre; Sala, Antonello; Smith, Chris; Virgili, Massimo; Zengin, Mustafa.
Baltic Sea Benthic ecosystem impacts from demersal fishery in the western Baltic is assumed to come mainly from Nephrops trawling in the central and southern Kattegat, mussel dredging in the Belt Sea, and mixed cod trawling in the western Baltic Sea.These fisheries both impact the seabed, as well as produce substantial amounts of discards. The western Baltic Sea offer a unique opportunity to analyse the benthic effects of fishingthanks to the closure of Øresund to towed gears since the 1920s, and the introduction of the Kattegat MPA in2009 (including cod closure) and the western Baltic Sea Natura-2000 areas. Furthermore an extensive benthic nationalmonitoring and data collection effort has taken place in the area over a number of years, which can be usedto...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00310/42142/41453.pdf
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Some expected impacts of the Common Fishery Policy on marine food webs ArchiMer
Kopp, Dorothee; Robert, Marianne; Chouvelon, Tiphaine; Mehault, Sonia.
For the ecosystem approach to fisheries management, understanding population dynamics and ecosystem resilience in response to the landing obligation acted by the reform of the European Common Fishery Policy (CFP) is currently an important avenue of research. This study attempts to assess the impact of the new CFP on marine food webs. Total carbon and nitrogen loss induced by a discard ban were estimated for the ecosystem of the Bay of Biscay based on French At-Sea Observer data and carbon and nitrogen content of discarded fish. Changes in predator diets were estimated by comparing two Bayesian mixing models, one mimicking the current situation and the second the application of the new CFP (removing the discarded species that would be landed from the...
Tipo: Text Palavras-chave: Fishery discards; Discard ban; Bay of Biscay; Organic input; Resource use.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00308/41895/41229.pdf
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Survivability of discarded Norway lobster in the bottom trawl fishery of the Bay of Biscay ArchiMer
Merillet, Laurene; Mehault, Sonia; Rimaud, Thomas; Piton, Corentine; Morandeau, Fabien; Morfin, Marie; Kopp, Dorothee.
In the context of the landing obligation set by the new Common Fisheries Policy (CFP), Norway lobster Nephrops norvegicus was identified as a species likely to have high survival rate when discarded in the bottom trawl fishery of the Bay of Biscay. Previous studies in this area reported a survival rate between 30% and 51%, but the experiments were done on a limited monitoring period and the seasonal variations were not investigated. This study was designed to obtain a reliable value for survival rate after a 14-day monitoring period in onshore tanks allowing considering delayed mortality. The study also tested the effect on the survival rate of using a discarding chute system, a sorting device that was made mandatory on the 1st of January 2017 for Nephrops...
Tipo: Text Palavras-chave: Nephrops norvegicus; Sorting process; Captivity; Vitality; Season; Discard survival.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00407/51864/52608.pdf
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Survival of discarded Nephrops norvegicus after trawling in the Bay of Biscay ArchiMer
Mehault, Sonia; Morandeau, Fabien; Kopp, Dorothee.
The new Common Fisheries Policy may exempt some species from the landing obligation if a high survival rate can be demonstrated among discards. This study focuses on the survival capacity of Nephrops norvegicus discarded from trawlers of the Bay of Biscay (France). Three sea trials were conducted on board 3 commercial trawlers and 15 fishing operations were sampled. The vitality of Nephrops was classed into three categories (healthy, moribund or dead) before release at sea and samples of healthy and moribund individuals were kept in captivity on Nephrops grounds for three days. A Generalised Linear Model was used to examine the variability in the proportion of healthy Nephrops discarded, which was significantly influenced by tow duration, duration of air...
Tipo: Text Palavras-chave: Vitality; Captivity; South western waters; Bottom trawl; GLM.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00346/45695/45355.pdf
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Survival of European plaice discarded from coastal otter trawl fisheries in the English Channel ArchiMer
Morfin, Marie; Kopp, Dorothee; Benoit, Hugues P.; Mehault, Sonia; Randall, Peter; Foster, Robert; Catchpole, Thomas.
Species that have a high likelihood of surviving the discarding process have become great concern since the European Union reformed the Common Fisheries Policy and enacted a landing obligation prohibiting the discarding any individuals of species under quota. Among species presenting an elevated survival potential, plaice (Pleuronectes platessa) is one of the most discarded in the coastal otter trawl fishery in the English Channel. The objective of this study is to provide the most reliable estimates of plaice survival after release in commercial conditions, and to identify the factors that influence survival rates. A captivity experiment was conducted in January–February in the English fishery to assess the survival of discarded plaice as a function of a...
Tipo: Text Palavras-chave: Landing obligation; Pleuronectes platessa; Vitality; Captivity experiment; Discard survival analysis; Bottom trawl.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00399/51048/52025.pdf
Registros recuperados: 21
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