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Registros recuperados: 64
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Campagne BERYX 4 de pêche à la palangre de fond et aux casiers dans le sud-est de la Nouvelle-Calédonie (N.O. "Alis", 20-23 janvier 1992) IRD
Grandperrin, René; Lehodey, Patrick; Marchal, Paul.
Beryx 4 se déroula dans le sud-est de la Nouvelle-Calédonie, au sud de l'île des Pins. Les objectifs de cette courte campagne étaient : recherche de #Beryx$ spp. dans cette zone à l'aide d'une palangre de fond, capture aux casiers de #Nautilus macromphalus$, essais de la sonde CTD. La ligne fut la même que celle qui fut utilisée lors des précédentes campagnes Beryx; 3 poses de 750 hameçons chacune furent réalisées à des profondeurs de 300, 400 et 600 m; aucun #Beryx$ ne fut capturé et les prises commerciales furent nulles à 400 et 600 m; les prises à 300 m comprenaient quelques #Lutjanidae$ (#Etelis$ spp. et #Pristipomoides$ spp.); l'ensemble de la campagne permit la récolte de 15 espèces différentes. 30 casiers parallélipipédiques furent mis à l'eau (10...
Tipo: Text Palavras-chave: PECHE EXPERIMENTALE; PALANGRE; CASIER; RESSOURCES HALIEUTIQUES; POISSON MARIN; CAMPAGNE OCEANOGRAPHIQUE; COMPOSITION DES PRISES.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:35592
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Campagne BERYX 10 de pêche à la palangre de fond sur trois monts sous-marins du sud-est de la zone économique de Nouvelle-Calédonie. (N.O."Alis", 18 au 27 Août 1992) IRD
Lehodey, Patrick; Marchal, Paul; Gallois, Francis; Nauges, Carole.
BERYX 10 fut la dixième campagne d'une série consacrée à l'étude des ressources halieutiques des monts sous-marins situés au sud-est de la Nouvelle-Calédonie. 8 pêches furent réalisées sur les monts B, K et D avec une palangre de fond du même type que celle qui fut mise en oeuvre par le palangrier "Humboldt". Un total de 6000 hameçons fut mis à l'eau. La diversité des prises (16 espèces) fut du même ordre que celle des campagne précédentes de pêche à la palangre de fond. Le rendement moyen en #Beryx$ fut 11.9 kg / 100 hameçons. Les autres espèces bien représentées furent #Rexe ante furcata$, #Etmopterus lucifer$ et #Squalus$ cf. #megalops$. Les prises firent l'objet de mensurations et de prélèvements (gonades et estomacs). 41 traits de filet à plancton...
Tipo: Text Palavras-chave: OCEANOGRAPHIE DES PECHES; RESSOURCES HALIEUTIQUES; POISSON MARIN; PECHE EXPERIMENTALE; GUYOT; ENGIN PECHE; PALANGRE DE FOND; CHALUT PELAGIQUE; ZONE ECONOMIQUE EXCLUSIVE; PECHE PROFONDE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:37733
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Campagne BERYX 5 de pêche à la palangre de fond sur deux monts sous-marins du sud-est de la zone économique de Nouvelle Calédonie (N.O. "Alis", 28 janvier - 6 février 1992) IRD
Lehodey, Patrick; Marchal, Paul; Mou-Tham, Gérard; Panche, Jean-Yves.
BERYX 5 fut la cinquième campagne d'une série consacrée à l'étude des ressources halieutiques des monts sous-marins situés au sud-est de la Nouvelle Calédonie. 8 pêches furent réalisées sur les monts B et K avec une palangre de fond du même type que celle qui fut mise en oeuvre par le palangrier "Humboldt". Un total de 8000 hameçons fut mis à l'eau. La diversité des prises (15 espèces) fut du même ordre que celle des campagnes précédentes de pêche à la palangre de fond. Les rendements en #Beryx$ furent excellents sur le mont B. Les autres espèces bien représentées furent #Rexea antefurcata$ et #Centrophorus sp.$. Les prises firent l'objet de mensurations et de prélèvements (gonades et estomacs). La bathymétrie réalisée sur le mont K a mis en évidence une...
Tipo: Text Palavras-chave: OCEANOGRAPHIE DES PECHES; POISSON MARIN; ZONE DE PECHE; GUYOT; ZONE ECONOMIQUE EXCLUSIVE; PECHE EXPERIMENTALE; TECHNIQUE DE PECHE; PALANGRE; ANALYSE QUANTITATIVE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:36660
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Modélisation de la distribution de Beryx splendens sur les monts sous-marins de Nouvelle-Calédonie IRD
Lehodey, Patrick; Marchal, Paul; Grandperrin, René.
Les prises commerciales et scientifiques de #Beryx splendens$ réalisées à la palangre de fond sur les monts sous-marins de Nouvelle-Calédonie ont été échantillonnées afin d'étudier, entre autres, les distributions de fréquences de longueurs. 16 674 poissons ont été mesurés. Les CPUE de #Beryx splendens$ sur deux monts sous-marins ont été modélisées en fonction des tailles et de la profondeur. Les données montrent que la taille moyenne augmente avec la profondeur ; ces observations sont correctement décrites par un "modèle binormal" qui fournit des estimations de CPUE pour un mont sous-marin donné. De plus, les données indiquent que la taille moyenne varie également avec la profondeur sommitale des monts, ce qui est pris en compte dans un "modèle récursif"...
Tipo: Text Palavras-chave: PECHE EXPERIMENTALE; POISSON MARIN; ESPECE COMMERCIALE; TECHNIQUE DE PECHE; PALANGRE; STOCK; PROFONDEUR; MODELISATION; MONT SOUS MARIN; MODELE BINORMAL; MODELE RECURSIF; RELATION ESPECE ENVIRONNEMENT.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40811
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Reproduction de Beryx splendens sur les monts sous-marins de Nouvelle-Calédonie IRD
Lehodey, Patrick; Marchal, Paul.
Tipo: Text Palavras-chave: POISSON MARIN; DYNAMIQUE DE POPULATION; MATURITE SEXUELLE; ANALYSE DE DONNEES; REPRODUCTION; FECONDITE; CORRELATION STATISTIQUE; HISTOLOGIE; GONADE; OVOGENESE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40809
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Modelling the distribution of alfonsino, Beryx splendens, over the seamounts of New Caledonia IRD
Lehodey, Patrick; Marchal, Paul; Grandperrin, René.
Commercial and scientific bottom longline catches of alfonsino, #Beryx splendens$, from seamounts of New Caledonia were sampled to study length-frequency distributions. A total of 14,674 fish were measured. CPUE of #Beryx splendens$ on two seamounts is modelled in terms of length and depth. The data show that mean length increases with depth ; this is well described by a bivariate normal model that estimates catch for a given seamount. In addition, the data show that mean length also varies with the depth of the top of seamounts ; this is described by a recursive model that is designed to predict approximate catch for any seamount. The limitations of both models are discussed, particularly with regard to temporal variation. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON MARIN; ECHANTILLONNAGE; LONGUE LIGNE; CROISSANCE; PROFONDEUR; ANALYSE STATISTIQUE; MODELE MATHEMATIQUE.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:010006413
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Area-based management and fishing efficiency ArchiMer
Marchal, Paul; Ulrich, Clara; Pastoors, M.
The scope of this study is to investigate the extent to which area-based management may have influenced the fishing efficiency of the Danish and Dutch demersal fleets harvesting cod, plaice and sole in the North Sea. Special consideration is given to the 'plaice box', a restricted area where fishing is prohibited to towed-gear fleets of horsepower exceeding 300 hp. An index of fishing power is calculated as the log-ratio between the catch per unit effort (CPUE) of any vessel and some survey abundance index. Annual trends in fishing are calculated as the year-effect derived from a general linear model (GLM) analysis of the index of fishing power. The fishing efficiency of Danish gill-netters and, to some extent, Danish seiners, has overall increased inside...
Tipo: Text Palavras-chave: Fishing efficiency; Plaice box; Fisheries management; North Sea; Demersal fisheries.
Ano: 2002 URL: https://archimer.ifremer.fr/doc/00589/70118/68112.pdf
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Fishing strategy development under changing conditions: examples from the French offshore fleet fishing in the North Atlantic ArchiMer
Holley, Jean-francois; Marchal, Paul.
A typology is presented for the French offshore fleet fishing in the North Atlantic. The investigation was carried out separately for all years between 1985 and 2002. Two methods were combined: PCA and cluster analysis. In 1985, most vessels targeted saithe off western Scotland (vessels from Lorient) and in the northern North Sea (vessels from Boulogne and Fecamp). Then, probably because of the decline in biomass of saithe, some vessels started to target deepwater species from the early 1990s. In 2002, some vessels fished exclusively for saithe (>80%), while others targeted mainly deepwater species. In all, 12 fisheries are identified for the period 1985-2002. Results are given of a preliminary investigation trying to identify the external factors...
Tipo: Text Palavras-chave: Saithe; Multivariate analyses; Mixed fisheries; Fishing strategy; Fisheries dynamics; Deepwater species.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-384.pdf
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Improving the definition of fishing effort for important European fleets by accounting for the skipper effect ArchiMer
Marchal, Paul; Andersen, B; Bromley, D; Iriondo, A; Mahevas, Stephanie; Quirijns, F; Rackham, B; Santurtun, M; Tien, N; Ulrich, Clara.
The scope of this paper is to quantify, for a wide selection of European fisheries, fishing tactics and strategies and to evaluate the benefits of adjusting the definition of. fishing effort using these elements. Fishing tactics and strategies were identified by metiers choices and a series of indices. These indices have been derived to reflect shifts in tactics (within a fishing trip) and in strategies (within a year). The Shannon-Wiener spatial diversity indices of fishing tactics (FT_SW) and strategies (YE_SW) had the greatest impact on catch rates. In particular, FT_SW was always negatively correlated to catch rates. One may anticipate that during a fishing trip, vessels with high FT_SW have been searching fish aggregations for a long time, while...
Tipo: Text Palavras-chave: Fishing effort; Fishing mortality; Catch rates; GLM modeling; Skipper effect.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/publication-1339.pdf
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Impact of technological creep on fishing effort and fishing mortality, for a selection of European fleets ArchiMer
Marchal, Paul; Andersen, Bo; Caillart, B.; Eigaard, Ole; Guyader, Olivier; Hovgaard, Holger; Iriondo, Ane; Le Fur, Fanny; Sacchi, Jacques; Santurtun, Marina.
Face-to-face interviews were conducted to identify the main changes in gear and vessel technology that may have improved the fishing efficiency of a number of French, Danish, and Basque fleets over the past few decades. Important changes include the gradual appearance of twin trawls (Danish and French trawlers) and trammel-nets (French gillnetters), and the increased polyvalence of Basque bottom trawlers. The results suggest that fishing effort descriptors that are not traditionally measured (gear type, groundrope type, length of net used per day, headline length, crew size, number of winch or net drums) may have a substantial impact on catch rates. Adjusting fishing effort using such descriptors may generally improve the relationship between fishing...
Tipo: Text Palavras-chave: Twin trawls; Technological creep; Groundrope; Generalized linear models; Fishing mortality; Fishing effort; Catch rate.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2611.pdf
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Linkage between fishers' foraging, market and fish stocks density: Examples from some North Sea fisheries ArchiMer
Marchal, Paul; Poos, Jan-jaap; Quirijns, Floor.
This study has investigated some properties of fishermen's foraging, using Levy flights theory. The case studies examined were a selection of North Sea Dutch and French vessels, for which catch and effort data were collected on a haul-by-haul basis. Foraging behavior could reasonably be represented by a Levy flight process, characterized by an exponentiation factor mu, for both fleets. The properties of fishers' foraging were further investigated for the Dutch fleet using time series analysis. Optimal foraging was found with mu = 1.5, suggesting a slow recovery dynamics of the stocks being harvested. Efficient foraging led to high value per unit effort, while the knowledge of fishing grounds with high stock density is shown to increase foraging efficiency...
Tipo: Text Palavras-chave: Haul by haul data; Foraging; Fishing effort; Levy flights; Fleet behavior.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2314.pdf
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A comparative analysis of métiers and catch profiles for some French demersal and pelagic fleets ArchiMer
Marchal, Paul.
A quantitative comparison between metiers and resulting catch profiles was carried out for seven French demersal and pelagic fleets operating in the North Sea, the eastern Channel, and the Bay of Biscay. Typologies for four metiers have been attempted, based on different factors (gear, mesh size, fishing ground, and/or a priori target species), data sources (logbooks or harbour enquiries), and aggregation levels. Catch profiles were selected through cluster analysis. The linkage between metiers and catch profiles was quantified using uncertainty coefficients, which depended on the metier typology being used and the fleet under consideration, but were not subject to substantial inter- or intra-annual fluctuations. Future catch profiles and metiers were...
Tipo: Text Palavras-chave: Uncertainty coefficients; Metiers; Fleets; Fishing intention; Catch profiles.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4075.pdf
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A dynamic model of the Bay of Biscay pelagic fleet simulating fishing trip choice: the response to the closure of the European anchovy (Engraulis encrasicolus) fishery in 2005 ArchiMer
Vermard, Youen; Marchal, Paul; Mahevas, Stephanie; Thebaud, Olivier.
The scope of this paper is to describe, evaluate, and forecast fishing trip choices of the Bay of Biscay pelagic fleet using random utility modeling (RUM). First, alternative fishing trip choices of this fleet were identified using multivariate statistical methods based on species landings weighted by value and defined as distinct fishing activity or fisheries (termed metiers). A RUM was specified, which included trip components as attributes during the period 20012004 ( a lagged percentage of the value per unit of effort of the main species caught, total value per unit of effort, and inertia in terms of changes from one metier to another). For the main metiers, the proportion of correct effort allocation is 90% during the calibration period of 2001-2004....
Tipo: Text Palavras-chave: Management; Métier; Fishing effort; Fisher's behavior; RUM.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6096.pdf
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Evolution et répartition de la capacité physique et de l'effort de pêche des navires français. Estimation de l'adéquation de la capacité utilisée et des possibilités de pêche ArchiMer
Leonardi, Sophie; Leblond, Emilie; Le Blond, Samuel; Marchal, Paul.
Ce document vise à fournir des informations concernant la situation des différents stocks et la capacité des flottilles françaises et communautaires sur ces stocks. Il met à disposition des données permettant de mesurer : 1. l'évolution de la capacité physique de la flotte française. Celle-ci est abordée à travers la puissance nominale totale (kW), la puissance moyenne (kW) et le nombre de navires. L'évolution de ces indicateurs est fournie depuis 1983 pour la façade Mer du Nord – Manche – Atlantique et la façade Méditerranée, depuis 1997 pour les Départements d'Outre Mer (DOM). Dans un premier temps, l'ensemble des navires français inscrits au fichier flotte sont pris en compte. Dans un second temps, seuls les navires actifs sont retenus en distinguant...
Tipo: Text Palavras-chave: Capacité des navires; Effort de pêche; Production; Atlantique; Mer du Nord; Méditerranée; Flotte française; Boat capacity; Fishing effort; Production; Atlantic; North sea; Mediterranean sea; French fleet.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00001/11213/7587.pdf
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The relative weight of traditions, economics, and catch plans in New Zealand fleet dynamics ArchiMer
Marchal, Paul; Lallemand, Philippe; Stokes, Kevin.
We investigate the relative weights of catch plans expected profit, and traditions in fishers' decision-making For five New Zealand fleets subject to an individual transferable quota (ITQ) management regime. Metiers were defined for these fleets as a combination of bears. management units, and a targeting index (either target species or statistical area) A nested logit random utility model was Used to model the metier allocation of fishing, effort in relation to catch plans, expected profit, and Past fishing allocations. This study showed that traditions and catch plans appeared to be important determinants of fishers' behavior for these New Zealand fleets. The model developed in thiS study filled the data generally well and was also able to predict, in...
Tipo: Text Palavras-chave: Random Utility Model; New Zealand fisheries; Fleet dynamics; Catch plans; Individual Transferable Quotas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6418.pdf
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A comparative review of the fisheries resource management systems in New Zealand and in the European Union ArchiMer
Marchal, Paul; Lallemand, Philippe; Stokes, Kevin; Thebaud, Olivier.
This review aims at comparing the fisheries management systems existing in New Zealand and in the European Union. The involvement of stakeholders at all stages of the management process is generally more transparent and better established in New Zealand than in the EU. Both systems aim at achieving an adequate balance between sustainability and utilisation and consider the precautionary approach as a founding principle. The social objectives are probably more explicit in the EU management system. In New Zealand, B-MSY is a legal management target for all stocks in the quota management system (QMS), but management strategies were poorly explicit until most recently. In the EU, there have not been any legal management targets or strategies until 1999. Since...
Tipo: Text Palavras-chave: Fisheries; Total allowable catches; Rights based management; Quota; Atlantic Ocean; Pacific Ocean.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11167/7534.pdf
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Catch-quota balancing in mixed-fisheries: a bio-economic modelling approach applied to the New Zealand hoki (Macruronus novaezelandiae) fishery ArchiMer
Marchal, Paul; Francis, Chris; Lallemand, Philippe; Lehuta, Sigrid; Mahevas, Stephanie; Stokes, Kevin; Vermard, Youen.
Managing adequately the exploitation of commercial species subject to technical interactions is a key step towards the ecosystem approach to fisheries. We evaluate here, using a bio-economic modelling approach building on the ISIS-Fish simulation platform, the relative impact of total allowable commercial catches (TACC) and of taxes applicable to over-quota landings (deemed value) on the sustainability of a selection of species exploited by the New Zealand hoki (Macruronus novaezelandiae) fishery. We investigate some aspects of the hoki mixed fisheries, consisting of four fleets and nineteen metiers, by considering the technical interactions between hoki and Southern hake (Merluccius australis). The dynamics of effort allocation were modelled using gravity...
Tipo: Text Palavras-chave: Fleet dynamics; New Zealand hoki fishery; Deemed value; Fisheries management.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11168/7521.pdf
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Identifying fishing trip behaviour and estimating fishing effort from VMS data using Bayesian Hidden Markov Models ArchiMer
Vermard, Youen; Rivot, Etienne; Mahevas, Stephanie; Marchal, Paul; Gascuel, Didier.
Recent advances in technologies have lead to a vast influx of data on movements, based on discrete recorded position of animals or fishing boats, opening new horizons for future analyses. However, most of the potential interest of tracking data depends on the ability to develop suitable modelling strategies to analyze trajectories from discrete recorded positions. A serious modelling challenge is to infer the evolution of the true position and the associated spatio-temporal distribution of behavioural states using discrete, error-prone and incomplete observations. In this paper, a Bayesian Hierarchical Model (HBM) using Hidden Markov Process (HMP) is proposed as a template for analyzing fishing boats trajectories based on data available from...
Tipo: Text Palavras-chave: Bayesian Hierarchical Models; Hidden Markov Model; State-space model; VMS; Fleet behaviour; Fishing effort.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00009/11993/9342.pdf
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Dynamique de la mortalité par pêche et impact sur la gestion des ressources halieutiques ArchiMer
Marchal, Paul.
Ce mémoire présente une contribution à la recherche sur la dynamique de la mortalité par pêche (F) et son impact sur la gestion des ressources halieutiques. La première étape de cette démarche a été de réduire la complexité des systèmes halieutiques étudiés, en regroupant les bateaux et leurs activités en flottilles et métiers respectivement. Plusieurs méthodes existent pour définir les métiers, certaines basées sur les variables d’entrée (engin, zone de pêche, espèces cibles), d’autres sur les variables de sortie (profils de capture). Une comparaison de ces méthodes pour les flottilles françaises indique que les meilleures correspondances sont obtenues pour les flottilles les plus sélectives (e.g., chalutiers pélagiques, fileyeurs). Une fois les...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00031/14251/11535.pdf
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Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries ArchiMer
Marchal, Paul; Little, L. Richard; Thebaud, Olivier.
A simulation modelling approach is used to assess the respective performances of different regimes of quota allocation (fixed or transferable), quota ownership (owned or not by fishers), and taxation for catching fish above quota. The simulations account for a variety of fleet behaviours (ranging from fixed by tradition to dynamic economics-driven). The modelling framework is applied to the Channel flatfish mixed fisheries. Transferable quota allocation regimes would particularly benefit small netters and beam trawlers, which would achieve a profit of (sic)50-150 million without compromising the conservation of eastern Channel sole, but it could impair the sustainability of other stocks. If quota is owned by fishers, the least fishing-efficient fleet stops...
Tipo: Text Palavras-chave: Channel flatfish mixed fisheries; Fisheries management; Fleet dynamics; Individual quotas; Overquota landing tax; Plaice (Pleuronectes platessa); Sole (Solea solea).
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00044/15492/12971.pdf
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