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Registros recuperados: 33
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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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A bioeconomic analysis of the impact of decommissioning programs: Application to a limited-entry french scallop fishery ArchiMer
Guyader, Olivier; Daures, Fabienne; Fifas, Spyros.
The objective of this paper is to assess the benefits and costs of decommissioning policies aimed at reducing fleet capacity through premiums offered by the public authority to fishermen to scrap their vessels. A case study, the limited entry scallop fishery of the Saint Brieuc Bay, France, is used to con- sider the problem of excess capacity and to model the bioeconomic consequences of disinvestment behavior. Special attention is paid to the assessment of fishermen's willingness to leave the fishery and to the implementation of public policy in terms of budget level and premiums offered to the fishermen. Spreadsheet simulations show that the impact of decommissioning programs is positive in terms of net surplus, even in the case of increasing technical...
Tipo: Text Palavras-chave: Fishing capacity; Decommissioning programs; Premium; Willingness to leave; Bioeconomic model; Cost-benefit analysis.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/00243/35449/33977.pdf
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A coupled biophysical model for the distribution of the great scallop Pecten maximus in the English Channel ArchiMer
Le Goff, Clement; Lavaud, Romain; Cugier, Philippe; Jean, Fred; Flye-sainte-marie, Jonathan; Foucher, Eric; Desroy, Nicolas; Fifas, Spyros; Foveau, Aurelie.
In this paper we used a modelling approach integrating both physical and biological constraints to understand the biogeographical distribution of the great scallop Pecten maximus in the English Channel during its whole life cycle. A 3D bio-hydrodynamical model (ECO-MARS3D) providing environmental conditions was coupled to (i) a population dynamics model and (ii) an individual ecophysiological model (Dynamic Energy Budget model). We performed the coupling sequentially, which underlined the respective role of biological and physical factors in defining P. maximus distribution in the English Channel. Results show that larval dispersion by hydrodynamics explains most of the scallop distribution and enlighten the main known hotspots for the population,...
Tipo: Text Palavras-chave: Population dynamic model; Ecophysiological model; English Channel; Pecten maximus; Spatial distribution.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00355/46642/46467.pdf
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A stochastic viability approach to ecosystem-based fisheries management ArchiMer
Doyen, Luc; Thebaud, Olivier; Bene, Christopher; Martinet, V.; Gourguet, S.; Bertignac, Michel; Fifas, Spyros; Blanchard, Fabian.
Academia and management agencies show a growing interest for ecosystem-based fishery management (EBFM). However, the way to operationalize this approach remains challenging. The present paper illustrates how the concepts of stochastic co-viability, which accounts for dynamic complexities, uncertainties, risk and sustainability constraints, can be useful for the implementation of EBFM. In the present case, this concept is used to identify fishing strategies that satisfy both ecological conservation and economic sustainability in a multi-species, multi-fleet context. Economic Viability Analysis (EVA) and the broader Co-Viability Analysis (CVA), are proposed to expand the usual Population Viability Analysis (PVA) and precautionary approach. An illustration is...
Tipo: Text Palavras-chave: Ecosystem based fisheries management; Viability; Stochastic; Nephrops; Hake.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00074/18571/16153.pdf
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Analyse des stratégies de contrôle dans une pêcherie gérée par l’effort de pêche : le cas de la pêcherie de coquilles Saint-Jacques de la baie de Saint-Brieuc ArchiMer
Le Gallic, Bertrand; Fifas, Spyros; Lesueur, Marie; Roncin, Nicolas; Ropars-collet, Carole.
Since a report by the European Court of Auditor in December 2007, EU officials have been suggesting that the failure of the Common Fisheries Policy (CFP) results from too much non compliance and a weak and inefficient enforcement system. As a result, a stakeholder consultation was organised EU-wide, and a new control regulation has been presented by the European Commission in autumn 2008. The objective of the paper is to discuss the reality and the scope of this assertion in the situation of a French coastal fishery managed through effort control (the Saint-Brieuc scallop fishery). Key outlines of the French control strategy are presented for the first time, based on an extensive work with the key stakeholders (national and regional administrations and...
Tipo: Text Palavras-chave: Contrôle; Fraude; Pêcheries; Économie; Aménagement; Control policy; Fraud behavior; Economics; Fisheries management.
Ano: 2010 URL: https://archimer.ifremer.fr/doc/00480/59148/61776.pdf
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Analyse et modelisation des parametres d'exploitation du stock de coquilles saint-jacques (pecten maximus, l.) en baie de saint-brieuc (manche ouest, france). ArchiMer
Fifas, Spyros.
The population dynamics is developed upon data on the age-composition of catches collected since 1974 by a sampling technic at two levels (fishing day, vessel). A temporally stratified sampling is carried out. A cohort analysis is realized through these data ; assumptions for the coefficients of natural and indirect fishing mortality are set up. Catchability models for all age groups are fitted. Catchability of the most abundant age groups (2 and 3) is an increasing function of their abundance and of the fishing fleet mean horse power. These functions present a maximum asymptotical value. Their adequation is explained by the adaptations of dredges and by the population sedentary life allowing the concentration of fishing fleet on the most abundant areas. A...
Tipo: Text Palavras-chave: Stratified sampling Temperature Spawning biomass Gowth Fecundity per recruit Yield per recruit Horse power Catchabiltry Cohort analysis Mortality Age composition of catches; Dredge Directed stock assessment Bay of Saint Brieuc Pecten maximus Scallop Biomasse féconde Croissance Evaluation directe Echantillonnage stratifié Température. Fécondité par recrue Rendement par recrue Puissance motrice Capturabilité Analyse des cohortes Mortalité Structure démographique des Drague Baie de Saint Brieuc Pccten maximus Coquille Saint Jacques.
Ano: 1993 URL: https://archimer.ifremer.fr/doc/1993/rapport-1518.pdf
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Application of Leslie's model on a population of common dolphins (Delphinus delphis): Sensitivity study ArchiMer
Fifas, Spyros; Goujon, Michel; Antoine, Loic.
The rapid development of the albacore tuna (Thunnus alalunga) driftnet fishery in the Pay of Biscay (Atlantic ocean, France) has incited European management authorities to ask for a study of its ecological impact on populations of common dolphins and striped dolphins. A programme with onboard observers has been led during 1992 and 1993, and a sighting survey has allowed the evaluation of the abundances of fractions of populations in the studied area. For the population of common dolphins, the biological parameter estimation has allowed the building of a discrete age-structured model based on a Leslie matrix. Sensitivity studies have been conducted using four model parameters (age of first reproduction, interval between births, juvenile and adult survival...
Tipo: Text Palavras-chave: Survival rate; Driftnet fishery; Common dolphin; Linear model; Taux de survie; Pêche au filet maillant dérivant; Modèle linéaire; Modèle linéaire.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-865.pdf
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Approche de l'impact écologique de la pêcherie thonière au filet maillant dérivant en Atlantique nord-est ArchiMer
Goujon, Michel; Antoine, Loic; Collet, Anne; Fifas, Spyros.
This document presents the results of a study on the impact of the french albacore tuna drift net fishery, mainly at the dolphins population level. Data collected during two embarked observers campains in 1992 and 1993 and the results of a sighting survey in 1993 give an estimation of the population size of common and striped dolphins (61 888 and 73 843) and mean values of ratio fishing of mortality (0.7 and 1.6%). A model was built in order to simulate the effect of the 5% upper limits of fishing mortality (1.5 and 3%). These values would leed to an annual rate of decrease of -1 %. It is unlikely that such values would jeopardize the survival and the presence of these species. Total incidental catches represent 15% of these total catch; albacore tuna...
Tipo: Text Palavras-chave: Impact écologique; Filets maillants; Mammifères marins; Germon; Ecological impact; Drift nets; Marine mammals; Albacore.
Ano: 1993 URL: https://archimer.ifremer.fr/doc/1993/rapport-6862.pdf
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Caractéristiques de dragues et pêcheries ArchiMer
Pitel, Mathilde; Berthou, Patrick; Fifas, Spyros.
Basically, a dredge is a bottom-towed gear and consists of a metal frame with a blade or teeth, to dig into the sediment and extract the shelled molluscs, and a mesh bag to collect the catch. Whereas hand dredging is observed on some intertidal beds (Donax trunculus in France), the use of dredge generally needs a fishing boat. There is a great diversity of dredge types, with specific designs used to target different species in particular beds: Manual dredges for Donax (Donax trunculus), Warty venus (Venus verrucosa) and clams (Venerupis pulastra, Ruditapes sp) Dredges for King scallops (Pecten maximus) Dredges for Warty venus (Venus verrucosa) Dredge for Queen scallops (black and white, Chlamys varia and Chlamys opercularia) Dredges for small...
Tipo: Text Palavras-chave: Management; Environmental impact; Spisula; Bittersweet palourdi; Fishing boat; Clam; Dredge; Brittany; Gestion; Impact environnemental; Spisula; Amande; Navire de pêche; Drague; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4608.pdf
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Coquilles Saint Jacques de la baie de Saint Brieuc. Evaluation de l’impact occasionné par le réseau de transport d’électricité (RTE) depuis le futur parc d’éoliennes de la baie de Saint-Brieuc (projet IBERDROLA). Première analyse des résultats des campagnes d’évaluation directe (années 1991-2013) ArchiMer
Fifas, Spyros; Le Roy, Didier.
La société Ailes Marines (consortium Iberdrola-Eole Res) a pour projet l’installation d’un champ éolien offshore en baie de Saint-Brieuc. Le secteur d’emprise de ce futur champ fait l’objet d’études relatives aux ressources marines vivantes exploitées afin de quantifier l’impact causé par les travaux et par le fonctionnement de cet aménagement. Dans le même sens, des études sont prévues sur le parcours du réseau de transport d’électricité (appelée par la suite du texte "zone RTE") entre le parc d’éoliennes et le relais à terre. Cette zone RTE porte sur une superficie réduite, néanmoins elle est supposée induire un impact en terme de ressources marines exploitables ou tout au moins de leur exploitation, lors des travaux de mise en place. Il convient de...
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Ano: 2014 URL: https://archimer.ifremer.fr/doc/00233/34380/32732.pdf
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Eléments de connaissance sur le cycle biologique de la Coquille Saint-Jacques européenne (Pecten maximus) en Manche. ArchiMer
Foucher, Eric; Fifas, Spyros.
La pêche à la coquille Saint-Jacques en France est réglementée par une période d’ouverture hivernale (octobre à mi-mai de l’année suivante). De plus, dans certains gisements, l’accès à la pêcherie est soumis à des règles d’accès encore plus strictes (licences de pêche attribuées aux couples patrons/navires avec numerus clausus selon des caractéristiques techniques des navires et de leurs engins de pêche bien définies, contrôle de l'effort de pêche, maillages etc.). C’est le cas dans la partie côtière de la baie de Seine sensu stricto, en baie de Saint-Brieuc, en rade de Brest… Si cette pêche saisonnière a d’abord vocation à limiter la pression de pêche sur les populations (gestion par l’effort de pêche), elle coïncide également avec les phases critiques du...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00110/22175/19831.pdf
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Eléments d’information sur la coquille Saint-Jacques en baie de Seine et l’éventualité de la mise en place d’une zone de restriction spéciale ArchiMer
Foucher, Eric; Biseau, Alain; Berthou, Patrick; Fifas, Spyros; Forest, Andre; Vigneau, Joel.
La coquille Saint-Jacques en Manche Est, dont la plupart des gisements (baie de Seine étendue, Greenwich, Vergoyer, Bassurelles…) sont vraisemblablement inter-connectés, est aujourd’hui exploitée par des flottilles de plusieurs états membres de l’UE, selon des systèmes de réglementation différents. Le système d’exploitation français, historiquement basé sur une pêche intense concentrée en période automnale et hivernale, s’oppose radicalement au système anglo-saxon, plus ouvert, reposant davantage sur une exploitation tout au long de l’année, en particulier en été pour alimenter le marché français en noix fraîches, au moment où les français ne pêchent pas. De nombreuses discussions entre représentants professionnels des différents pays (lors des groupes de...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00024/13492/10500.pdf
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Estimating MSY and MEY in multi-species and multi-fleet fisheries, consequences and limits: an application to the Bay of Biscay mixed fishery ArchiMer
Guillen, Jordi; Macher, Claire; Merzereaud, Mathieu; Bertignac, Michel; Fifas, Spyros; Guyader, Olivier.
Most worldwide fish stocks are overexploited, and so exploited beyond the Maximum Sustainable Yield (MSY) and the Maximum Economic Yield (MEY). Not exploiting fisheries resources at MSY or MEY leads to the loss of production and rents from the fisheries. A large part of the EU fisheries are managed based on single species stock assessments; however, in reality, most species are caught together with other species and by different fleets. In multi-species and multi-fleet fisheries, single species assessments, and consequently MSY and MEY reference points, are often not valid, and so the catch recommendations. In this paper it is investigated the MSY and MEY estimation in multi-species and multi-fleet fisheries in comparison to single species assessments....
Tipo: Text Palavras-chave: MSY; MEY; Multi-species; Multi-fleet; Fisheries; Bio-economic model.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00129/24000/22053.pdf
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Etude de la pêcherie de palourdes du Golfe du Morbihan. ArchiMer
Berthou, Patrick; Huet, Jerome; Noel, Philippe; Jezequel, Michele; Fifas, Spyros.
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Ano: 1997 URL: http://archimer.ifremer.fr/doc/00272/38340/36577.pdf
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Etude de l'impact des engins de pêche trainants en zone cotière. Cas particulier du chalutage en Baie de Saint-Brieuc (Manche Ouest) ArchiMer
Hamon, Dominique; Berthou, Patrick; Fifas, Spyros.
Tipo: Text
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00392/50359/51060.pdf
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Evaluation and improvement of shellfish dredge design and fishing effort in relation to technical conservation measures and environmental impact: [ECODREDGE CT98-4465] ArchiMer
Lart, William; Jacklin, Marcus; Horton, Roger; Ward, Nigel; Arkely, Ken; Misson, Trevor; Allan, Peter; Savage, Thomas; Lart, Geoff; Berthou, Patrick; Priour, Daniel; Fifas, Spyros; Danioux, Christian; Pitel, Mathilde; Brand, Andy; Jenkins, Stuart; Allen, Hugh; Campbell, Ross; Da Ros, Luisa; Nesto, Nicoletta; Bianchi, Franco; Acri, Francesco; Boldrin, Alfredo; Nasci, Cristina; Penzo, Mauro; Antonini, Antonini; Cesca, Arduino; Marin, Marco; Pellizzato, Michele; Marin, Maria; Moschino, Vanessa; Pampanin, Daniela; Ballarin, Loriano; Casellato, Sandra; Masiero, Luciano; Del Favero, Marcello; Allan, Peter; Chicharo, Luís; Chicharo, Alexandra; Alves, Filipe; Tata Regala, João; Gaspar, Miguel B.; Santos, Miguel N.; Leitao, Francisco; Sobral, Manuel; Dias, Maria D.; Campos, Aida; Monteiro, Carlos C.; Falcao, Manuela M.; Vale, Carlos; Caetano, Miguel; Burnell, Gavin; Maguire, Julie; Byrne, Pam.
This project systematically examines the bivalve dredging process and its physiological and ecological consequences. The literature on ecology and population dynamics of the target species, dredge design and fisheries and the environmental effects of dredging and selectivity of dredging is reviewed. A programme of experimental work, both laboratory and field studies is described in scallop and clam dredge fisheries in European waters; scallop species (UK, France) Pecten maximus, Aequipecten opercularis, clam species (Italy; N. Adriatic) Chamelea gallina, clam species (Portugal) Spisula solida, Donax trunculus, Callista chione. Selectivity measures and dredge design are examined for their consequences in terms of environmental effects. Studies included...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00307/41851/41086.pdf
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Evaluation directe du stock de praires Venus verrucosa en rade de Brest ArchiMer
Pitel, Mathilde; Fifas, Spyros; Berthou, Patrick.
In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The drop in the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating demographic strategy. Large deposits are fairly rare. In 7 years, only one age group, born in 1971, withstood the fishery. Many age groups of satisfactory abundance, from the end of the 80s on, combined with a total disruption of the fishery for a few years, lead to a recovery of the stock with fishing levels equivalent (today) to those of the 1950s. The clam, though less iconic than the king scallop in the local context, has now been for a number of...
Tipo: Text Palavras-chave: Campaign; Jeancani; Survey; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Campagne à la mer; Venus verrucosa; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4603.pdf
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Evaluation du stock de praires en rade de Brest ArchiMer
Pitel, Mathilde; Martin, Stephane; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
Pendant les années 50, la praire a joué un rôle secondaire dans le contexte maritime local. Au cours des années 50, cette espèce était ciblée par une flottille différente de la coquille Saint-Jacques de la rade de Brest, à capacité de capture modeste (flottille du Relecq Kerhuon) permettant la réalisation des captures annuelles moyennes de l'ordre de 150 tonnes. La décennie 60, après l'effondrement du stock coquillier a vu la praire occuper une place de ressource de substitution pour atteindre des productions dépassant les 400 tonnes. Les premières étapes de l'évolution de cette pêcherie sont détaillées par Le Gall (1969) et Piboubès (1973). Petit à petit, la flottille s'est transformée (à partir des années 70, entrée progressive des goémoniers dans la...
Tipo: Text Palavras-chave: Jeancani; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Venus verrucosa; Ressource de substitution; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4602.pdf
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Evaluation du stock de praires en rade de Brest - 2001 ArchiMer
Pitel, Mathilde; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
During the 1950s, the clam played only a bit part in the local maritime context. It was the focus of a different fleet than the king scallop fleet, with a lesser fishing capacity (fleet from the Relecq Kerhuon) and an average annual catch of around 150 tonnes. In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The first stages of this evolution are detailed by Le Gall (1969) and Piboubès (1973). Slowly, the fleet developed (from the 70s on, with the progressive arrival of seaweed boats in the fishery) The drop of the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating...
Tipo: Text Palavras-chave: Venus verrucosa; Stock assessment; Clams; Bay of Brest; Brittany; Venus verrucosa; Évaluation de stock; Praires; Rade de Brest; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4607.pdf
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Evaluations locales des populations de bivalves dans le golfe de normand breton. Résultats de la campagne BIVALVES2002 ArchiMer
Pitel, Mathilde; Savina, Marie; Fifas, Spyros; Berthou, Patrick.
The exploited stocks of wild bivalves (common cockles, dog cockles, clams, and spisules) in the Norman-Breton gulf vary according to the fishing activity and the environmental conditions. Different studies, carried out by the Ifremer in this region (between 1982 and 1998), enabled the evaluation of the stocks available for fishing as well as the collection of data on these species (demographic structure, growth...). For more information on the 1993-1994 studies and a presentation of the site and the fishery please refer to the reports by Berthou, 1987 and Noël et al, 1995. The bivalve expedition conducted in May 2002, enabled us to update the data on the populations of dog cockles and banded carpet shells, then of spisules and clams, using the same...
Tipo: Text Palavras-chave: Bittersweet palourdi; Spisula; Clam; Brittany norman gulf; Bibalves; Brittany; Fishing; Crepidule; Amande de mer; Spisule; Praire; Palourde; Golfe normand breton; Bivalves; Bretagne; Pêche.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-4609.pdf
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