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A Bayesian two-stage biomass model applied to the English Channel stock of cuttlefish (Sepia officinalis) ArchiMer
Alemany, Juliette; Rivot, Etienne; Foucher, Eric; Vigneau, Joel; Robin, Jean-paul.
Among the English Channel fishery, the importance of cuttlefish stock has increased, following the cephalopods global landings and market trend. An adapted stock assessment model is needed in order to give good management advice with accurate uncertainties. Age based methods in this species are hampered by time consuming age determination with statoliths. A model requiring few data and adapted to the species life-history is therefore proposed. An assessment of this stock was conducted in June 2015 by fitting a two-stage biomass model on a 22 years’ time-series (1992-2014). The use of a Bayesian framework is particularly adapted for decision making, allowing the propagation of uncertainty in the model. It also permits the use of different sources of...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00379/49066/49514.pdf
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A Bayesian two-stage biomass model for stock assessment of data-limited species: An application to cuttlefish ( Sepia officinalis ) in the English Channel ArchiMer
Alemany, Juliette; Rivot, Etienne; Foucher, Eric; Vigneau, Joel; Robin, Jean-paul.
Cuttlefish is a key commercial species in the English Channel fishery in terms of landings and value. Age-based assessment methods are limited by time-consuming age determination with statoliths and the lack of stock assessment models tailored to this data-limited species. A two-stage biomass model is developed in the Bayesian state-space modelling framework that allows inferences to be made on the stock biomass at the start, middle and end of each fishing seasons between 1992 and 2014, while accounting for both process and measurement errors and to assimilate various sources of information. A method that uses ancillary length-frequency data is developed to provide an informative prior distribution for the biomass growth rate parameter g (E = 0.89) and its...
Tipo: Text Palavras-chave: English Channel; Cuttlefish; Sepia officinalis; Bayesian state-space model; Data-limited stock; Two-stage biomass model.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00376/48766/49289.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 two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock ArchiMer
Gras, Michael; Roel, Beatriz A.; Coppin, Franck; Foucher, Eric; Robin, Jean-paul.
The English Channel cuttlefish (Sepia officinalis) is the most abundant cephalopod resource in the Northeast Atlantic and one of the three most valuable resources for English Channel fishers. Depletion methods and age-structured models have been used to assess the stock, though they have shown limitations related to the model assumptions and data demand. A two-stage biomass model is, therefore, proposed here using, as input data, four abundance indices derived from survey and commercial trawl data collected by Ifremer and Cefas. The model suggests great interannual variability in abundance during the 17 years of the period considered and a decreasing trend in recent years. Model results suggest that recruitment strength is independent of spawning-stock...
Tipo: Text Palavras-chave: Abundance indices; English Channel; Exploitation rate; Sepia officinalis; SST; Stock–recruitment relationship; Trawl survey; Two-stage biomass model.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00248/35923/34448.pdf
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Analyse de l'évolution des puissances de pêche par l'analyse des corhortes : application aux senneurs exploitant l'albacore (Thunnus albacares) dans l'Atlantique est IRD
Gascuel, D.; Fonteneau, Alain; Foucher, Eric.
Une méthode d'ajustement de l'analyse des cohortes, combinant calcul en mode inverse et calcul en mode direct, est présentée; elle permet d'analyser l'évolution des puissances de pêche par flottille et par âge, à partir de la matrice des capturabilités nominales. La méthode est appliquée aux deux principales flottilles exploitant l'albacore dans l'Atlantique Est, entre 1980 et 1990 : les senneurs franco-ivoiro-sénégalais (FIS) et les senneurs espagnols. A l'aide d'un modèle linéaire généralisé, les puissances de pêche globales sont décomposées en deux termes : puissances locales et efficiences globales. Les évolutions tendancielles des trois grandeurs, puissances globales, puissances locales et efficiences globales, par catégorie d'âge ou en moyennes, sont...
Tipo: Text Palavras-chave: PUISSANCE DE PECHE; PECHE THONIERE; SENNEUR; ANALYSE STATISTIQUE; APPLICATION; ALBACORE; ANALYSE DES COHORTES; EVOLUTION DES PECHERIES.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:37890
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Channel and North Sea ray stock assessment in a data limited framework ArchiMer
Amelot, Morgane; Bastleer, Jurgen; Foucher, Eric; Girardin, Raphael; Marchal, Paul; Poos, Jan Jaap; Sys, Klaas.
Rajidae stocks (Raja clavata, Raja brachyura, Raja montagui, Raja microocellata, Leucoraja naevus and Raja undulata) in the English Channel and North Sea (ICES divisions 3a, 4 and 7d) are actually managed as a complex (“skates and rays”) and subject to a single TAC. TAC advices from the ICES are based on scientific survey indices trends from each species. Rajidae catches are mainly bycatch from flatfish fisheries such are sole (Solea solea) and plaice (Pleuronectes platessa) fisheries. Furthermore, because of their top predator position as well as their life history, Rajidae are species sensitive to overfishing. These different factors have led to a revision in stock assessment methods. ICES classified Rajidae as category 3 data limited stocks. The lack of...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00620/73220/72433.pdf
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Communication de l’information géographique maritime et côtière pour la gestion d’une crise environnementale : le naufrage du chimiquier « Ievoli Sun » en Centre Manche ArchiMer
Loubersac, Lionel; Lazure, Pascal; Dumas, Franck; Le Roux, Jean-francois; Riou, Philippe; Foucher, Eric; Guillaumont, Brigitte.
On the morning of the 31th October 2000, the Italian chemical tanker “Ievoli Sun” sank in the central Channel. Her cargo presented a risk of contamination for the marine environment and nearby coastal environment. From the moment the sinking was announced, Ifremer decided to implement, in almost real time, tools to produce and communicate environmental data. This paper presents the solutions chosen to develop: - a Geographic Information System to prepare maps, - a series of simulations for dispersion at sea of dissolved products - a general information web site structure (see http://www.ifremer.fr/envlit/surveillance/ievoli.htm). This paper will go beyond technical presentations of methods, tools and results obtained to take a critical look at the site’s...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00089/20054/17695.pdf
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Ecosystem trends: evidence for agreement between fishers' perceptions and scientific information ArchiMer
Rochet, Marie-joelle; Prigent, M; Bertrand, Jacques; Carpentier, Andre; Coppin, Franck; Delpech, Jean-paul; Fontenelle, G; Foucher, Eric; Mahe, Kelig; Rostiaux, Emilie; Trenkel, Verena.
The results of a survey on fishers' perceptions of recent changes in the eastern English Channel ecosystem carried out in 2006 were compared with fishery and bottom-trawl survey data. A hypothesis-testing framework was used, testing the null hypothesis that fishers' statements were true, which permitted evaluation of both agreement and disagreement. Overall good agreement between fishers' statements and scientific data was found, and both sources suggested that the fish community in the Channel is undergoing large changes, among which are decreases in some commercially important species; in addition, a number of human pressures impact the ecosystem. Fishers had an accurate perception of changes and their time-frames, but not necessarily of their causes....
Tipo: Text Palavras-chave: Stakeholder interview; Hypothesis testing; Fisher knowledge; Ecosystem approach to fisheries management; Eastern English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4474.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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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine. Résultats de la campagne COMOR 36 ArchiMer
Foucher, Eric.
Les campagnes scientifiques COMOR ont pour objectif majeur de procéder à l'évaluation directe du stock de coquilles Saint-Jacques de la baie de Seine (gisement classé) et de la zone nord directement limitrophe au gisement classé, que nous appelons « Proche Extérieur ». Cette évaluation repose sur un plan d'échantillonnage aléatoire stratifié, chaque trait de drague représentant un point d'échantillonnage. Les données recueillies permettent d'estimer des indices d'abondance par classe d'âge et par zone, la biomasse disponible par zone, la structure démographique de la population, et la répartition de la population sur le fond.
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Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-6547.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 37. Perspectives et recommandations pour une pêcherie durable ArchiMer
Foucher, Eric.
Les campagnes scientifiques COMOR ont pour objectif majeur de procéder à l'évaluation directe du stock de coquilles Saint-Jacques de la baie de Seine (gisement classé) et de la zone nord directement limitrophe au gisement classé, que nous appelons « Proche Extérieur ». Cette évaluation repose sur un plan d'échantillonnage aléatoire stratifié, chaque trait de drague représentant une unité d'échantillonnage. Les données recueillies permettent d'estimer des indices d'abondance par classe d'âge et par zone, la biomasse disponible par zone, la structure démographique de la population, et la répartition de la population sur le fond. La campagne COMOR37 a eu lieu du 3 au 21 juillet 2007. Contrairement à la précédente campagne de 2006, les conditions...
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Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-6548.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 38. Perspectives et recommandations pour une pêcherie durable ArchiMer
Foucher, Eric.
The COMOR scientific cruises are aimed mostly at assessing directly the king scallop stock in the Seine Bay (listed deposit) and in the area located north of the listed deposit, and baptised "Proche Extérieur" (Close Outside). The assessment is based on a stratified random sampling scheme, each dragging accounting for one sample unit. The collected data enables the valuation of the abundance indexes par age class and area, the biomass available on each area, the demographic structure of the population, and the distribution of the population on the seabed. [...]
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/rapport-6549.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 39 (1er au 17 juillet 2009). Perspectives et recommandations pour une pêcherie durable. ArchiMer
Foucher, Eric.
Les campagnes d’évaluation du stock de coquilles Saint-Jacques Pecten maximus de la baie de Seine (COMOR) ont pour objectif principal d’établir un diagnostic annuel de l’état de la ressource (abondance par classes d’âge, croissance observée, répartition sur le fond) avant l’ouverture de la saison de pêche. Depuis une vingtaine d’années la campagne a lieu en juillet, meilleur compromis entre une pousse suffisante des coquilles du groupe 1, plus rapide en baie de Seine qu’en baie de St-Brieuc et permettant leur capture par les dragues, et l'élaboration précoce d'une expertise permettant aux acteurs (administratifs, organisation de marché, commission professionnelle, …) de prendre les mesures les mieux adaptées à la réalité perçue à travers les résultats de...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00160/27102/25274.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 40 (30 juin - 17 juillet 2010). Perspectives et recommandations pour une pêcherie durable. ArchiMer
Foucher, Eric.
The main aim of King scallops Pecten maximus stock assessment French surveys in the Bay of Seine (COMOR) is to set an annual primary diagnosis of the state of the resource (abundance by age classes, growth, distribution on the seabed) before the opening of the fishing season. For twenty years, the survey takes place in July, best compromise between enough growing of the group 1 shells, faster in the Bay of Seine than in the Saint-Brieuc Bay, allowing their capture by sampling dredges, and early expertise which allows to stakeholders (administrative, market organization, professional committee, ...) to take the best measures suited to the reality perceived through the survey’s results. The results are presented in distinguishing the off-shore part of the...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00160/27101/25272.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 41 (1 au 18 juillet 2011). Perspectives et recommandations pour une pêcherie durable. ArchiMer
Foucher, Eric.
The main aim of King scallops Pecten maximus stock assessment French surveys in the Bay of Seine (COMOR) is to set an annual primary diagnosis of the state of the resource (abundance by age classes, growth, distribution on the seabed) before the opening of the fishing season. For twenty years, the survey takes place in July, best compromise between enough growing of the group 1 shells, faster in the Bay of Seine than in the Saint-Brieuc Bay, allowing their capture by sampling dredges, and early expertise which allows to stakeholders (administrative, market organization, professional committee, ...) to take the best measures suited to the reality perceived through the survey’s results. The results are presented in distinguishing the off-shore part of the...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00160/27100/25271.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 42 (3 au 20 juillet 2012). ArchiMer
Foucher, Eric.
The main aim of King scallops Pecten maximus stock assessment French surveys in the Bay of Seine (COMOR) is to set an annual primary diagnosis of the state of the resource (abundance by age classes, growth, distribution on the seabed) before the opening of the fishing season. For twenty years, the survey takes place in July, best compromise between enough growing of the group 1 shells, faster in the Bay of Seine than in the Saint-Brieuc Bay, allowing their capture by sampling dredges, and early expertise which allows to stakeholders (administrative, market organization, professional committee, ...) to take the best measures suited to the reality perceived through the survey’s results. The results are presented in distinguishing the off-shore part of the...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00160/27099/25284.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 43 (3 au 24 juillet 2013) ArchiMer
Foucher, Eric.
The main aim of King scallops Pecten maximus stock assessment French surveys in the Bay of Seine (COMOR) is to set an annual primary diagnosis of the state of the resource (abundance by age classes, growth, distribution on the seabed) before the opening of the fishing season. For twenty years, the survey takes place in July, best compromise between enough growing of the group 1 shells, faster in the Bay of Seine than in the Saint-Brieuc Bay, allowing their capture by sampling dredges, and early expertise which allows to stakeholders (administrative, market organization, professional committee, ...) to take the best measures suited to the reality perceived through the survey’s results. The results are presented in distinguishing the off-shore part of the...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00158/26890/25021.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 44 (5 au 22 juillet 2014) ArchiMer
Foucher, Eric.
The annual assessment survey of the bay of Seine Pecten maximus scallop stock (COMOR44) took place from 4 to 23 July 2014. 183 dredges tows were carried out on the whole survey area. For all areas, the exploitable biomass consists only of 3 years and older scallops. The 2 years old scallops (cohort born in 2012) constituting the recruitment is virtually inexistent. Moreover, the observed growth is low for all adult individuals. The 1 year cohort is relatively abundant, their average size being in the average observed over the last 10 years. The global population is expected to increase again in 2015.
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00253/36430/34973.pdf
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Evaluation annuelle du stock de coquilles Saint-Jacques de la baie de Seine : résultats de la campagne COMOR 45. (7 au 24 juillet 2015) ArchiMer
Foucher, Eric.
Each year, Ifremer evaluates the Bay of Seine stock of King scallop Pecten maximus, using data collected during a summer scientific survey. The survey COMOR45 took place in July 2015, during which 171 dredge hauls were made in the classified ground of Bay of Seine (located in French territorial waters) and the "Near Outside", area located further north, between the 12-mile limit and the parallel 49°48N. The results of the assessment show, for all the areas surveyed, an excellent recruitment made of 2 years old individuals (cohort 2013), a low amount of adults (3 years old and more King scallop), and a massive amount of 1 year old scallops (pre-recruitment). The exploitable biomass is estimated at 14138 and 10779 tons, respectively to the Bay of Seine and...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00299/41053/40210.pdf
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