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Registros recuperados: 61
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A Bayesian state-space model to estimate population biomass with catch and limited survey data: application to the thornback ray (Raja clavata) in the Bay of Biscay ArchiMer
Marandel, Florianne; Lorance, Pascal; Trenkel, Verena M..
The thornback ray (Raja clavata) in the Bay of Biscay is presumed to have declined during the 20th Century. To evaluate this decline and estimate biomass trajectories, a hypothetical catch time series was created for the period 1903-2013. A Bayesian state-space biomass production model with a Schaefer production function was fitted to the hypothetical catch time series and to a shorter research vessel Catch Per Unit Eeffort (CPUE) time series (1973-2013, with missing years). A censored likelihood made it possible to obtain biomass estimates without a CPUE time series or only with an estimate of biomass depletion. A simulation-estimation approach showed a high sensitivity of results to the prior for the intrinsic growth rate. The model provided biomass...
Tipo: Text Palavras-chave: Population dynamics; Stock assessment; Data poor; Censored data; Bayes; Thornback ray; State-space model.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00359/47032/46947.pdf
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A random effects population dynamics model based on proportions-at-age and removal data for estimating total mortality ArchiMer
Trenkel, Verena; Bravington, Mark V.; Lorance, Pascal.
Catch curves are widely used to estimate total mortality for exploited marine populations. The usual population dynamics model assumes constant recruitment across years and constant total mortality. We extend this to include annual recruitment and annual total mortality. Recruitment is treated as an uncorrelated random effect, while total mortality is modelled by a random walk. Data requirements are minimal as only proportions-at-age and total catches are needed. We obtain the effective sample size for aggregated proportion-at-age data based on fitting Dirichlet-multinomial distributions to the raw sampling data. Parameter estimation is carried out by approximate likelihood. We use simulations to study parameter estimability and estimation bias of four...
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00130/24168/22506.pdf
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Age estimation and growth of some deep-sea fish from the northeast Atlantic ocean ArchiMer
Allain, Valerie; Lorance, Pascal.
Age is a necessary parameter used in population dynamics to assess the state of exploited resources. This parameter is poorly known for most deep-sea species (depth > 400 m). This work focused on age estimation from otoliths of Alepocephalus bairdii (Alepocephalidae), Coryphaenoides rupestris (Macrouridae), Helicolenus dactylopterus (Sebastidae) and Hoplostethus atlanticus (Trachichthyidae), which French fishery exploitation, off the west coasts of the British Isles, began the late 1980's. Considering otolith growth zones as annual, the four species all show high longevity: 38, 54, 43 and 130 years, respectively, together with slow growth. The differences in growth between sex were estimated and difficulties in accurately estimating the age were...
Tipo: Text Palavras-chave: Alepocephalus bairdii; Coryphaenoides rupestris; Helicolenus dactylopterus; Hoplostethus atlanticus; ANE; Slope fish; Age estimation; Otoliths.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10396/7690.pdf
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Analysis of species associations in deep-sea fisheries off the British Isles from an industry haul-by-haul database ArchiMer
Baulier, Loic; Pawlowski, Lionel; Lorance, Pascal; Trenkel, Verena.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12951/9926.pdf
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Assessing the risk of vulnerable species exposure to deepwater trawl fisheries: the case of orange roughy Hoplostethus atlanticus to the west of Ireland and Britain ArchiMer
Dransfeld, Leonie; Gerritsen, Hans D.; Hareide, Nils R.; Lorance, Pascal.
With slow growth rates, late maturity and a high maximum age of 100 years or more, orange roughy can be classified as a vulnerable deepwater fish species that can only sustain low rates of exploitation. Historical patterns of exploitation associated with this species suggest that it is currently not possible to manage its fisheries in the Northeast Atlantic sustainably, and the total allowable catch for orange roughy has been gradually reduced to zero for European fisheries since 2010. Orange roughy to the west of Ireland and Britain occurs on distinct bathymetric features (seamounts, hills and canyons) as well as on flat ground along the continental slope. Productivity-susceptibility analysis (PSA) was performed to evaluate the biological vulnerability of...
Tipo: Text Palavras-chave: Ecological risk assessment; VMS; Continental slope; Beryciformes; Atlantic Ocean.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00176/28758/27234.pdf
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Assessment of impacts from human activities on ecosystem components in the Bay of Biscay in the early 1990s ArchiMer
Lorance, Pascal; Bertrand, Jacques; Brind'Amour, Anik; Rochet, Marie-joelle; Trenkel, Verena.
The ecosystem-based approach to fisheries management and, more specifically, the European Marine Strategy Framework Directive require the assessment of the state and dynamics of an ecosystem in order to determine suitable management strategies. This paper takes an analytical approach to assess the state of the Bay of Biscay ecosystem in the early 1990s, chosen as a period of reference because key monitoring data series have been collected since then. To assess the state of the ecosystem, the pressures exerted by six broad categories of human activities were examined. A literature review of the ecosystem components was made and a component tree was tailored according to data availability. Data rich components were subdivided into subcomponents for their...
Tipo: Text Palavras-chave: Reference state; Ecosystem based management; Human pressure; Inventory; Atlantic Ocean.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11164/7520.pdf
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Behaviour and habitat utilisation of seven demersal fish species on the Bay of Biscay continental slope, NE Atlantic ArchiMer
Uiblein, F; Lorance, Pascal; Latrouite, Daniel.
Much is known in very broad terms about the distribution of deep-sea fishes, but information on fine-scale habitat selection and behaviour in the largest living space on earth is still rare. Based on video sequences from 4 dives performed with the manned submersible 'Nautile' at depths between 400 and 2000 in in the Bay of Biscay, NE Atlantic, we studied the behaviour of co-occurring slope-dwelling deep-sea fishes. Five different habitats were identified according to depth range or topographical and hydrological characteristics. For each fish species or genus that could be identified, estimates of absolute abundance were provided. The most frequently occurring species, round-nose grenadier Coryphaenoides rupestris, blackmouth catshark Galeus melastomus,...
Tipo: Text Palavras-chave: Submersible observations; Assemblage structure; Density; Locomotion; Vertical positioning; Foraging; Species specific; Behavioural flexibility.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00000/10666/7591.pdf
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Black scabbardfish, Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle ArchiMer
Farias, Ines; Morales-nin, Beatriz; Lorance, Pascal; Figueiredo, Ivone.
The biology, ecology, and dynamics of the deep-sea teleost black scabbardfish in the northeast Atlantic are reviewed. The black scabbardfish is a commercial bathypelagic species found in the NE Atlantic mostly from Iceland to the Canary Islands and Western Sahara, at depths from 800 to 1300 m. The spatial structure of its population is still uncertain, although the existence of one single stock that migrates around the NE Atlantic driven by feeding and reproduction is the most likely hypothesis consistent with available data. This review is based on data from commercial fisheries off the Faroe Islands, Hatton Bank, the west of the British Isles, and Portugal (mainland, Azores, and Madeira) and from Icelandic and Scottish scientific surveys collected...
Tipo: Text Palavras-chave: Deep-water longline fisheries; Migration; Life cycle; Trichiuridae; Aphanopus carbo; North Atlantic Ocean.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00175/28636/27058.pdf
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Catch Per Unit Effort of deep-sea species off the continental slope to the west of British Isles. ArchiMer
Girard, Marine; Lorance, Pascal; Biseau, Alain.
Catch Per Unit Effort (CPUE) trends of the main target species of the deep-sea fishery were recorded for one sample trawler in two areas to the west of the British Isles, from 1993 to 1997. Considered species were the orange roughy (Hoplostethus atlanticus), the roundnose grenadier (Coryphaenoides rupestris), the black scabbard fish (Aphanopus carbo) and two squalid sharks: the Portuguese dogfish (Centroscymnus coelolepis) and the leafscale gulper shark (Centrophorus squamosus). Two sources of data have been used: the catch and effort database of IFREMER and the personal logbooks of the skipper from the sample trawler. The personal logbooks indicate the catch per haul, whereas the IFREMER database provides the catch and effort per day and statistical...
Tipo: Text Palavras-chave: Hoplostethus atlanticus; Coryphaenoides rupestris; Aphanopus carbo; Centroscymnus coelolepis; Centrophorus squamosus; Continental slopes; Catch Per Unit Effort; Abundance indices.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10397/7689.pdf
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Coherent assessments of Europe's marine fishes show regional divergence and megafauna loss ArchiMer
Fernandes, Paul G.; Ralph, Gina M.; Nieto, Ana; Criado, Mariana Garcia; Vasilakopoulos, Paraskevas; Maravelias, Christos D.; Cook, Robin M.; Pollom, Riley A.; Kovacic, Marcelo; Pollard, David; Farrell, Edward D.; Florin, Ann-britt; Polidoro, Beth A.; Lawson, Julia M.; Lorance, Pascal; Uiblein, Franz; Craig, Matthew; Allen, David J.; Fowler, Sarah L.; Walls, Rachel H. L.; Comeros-raynal, Mia T.; Harvey, Michael S.; Dureuil, Manuel; Biscoito, Manuel; Pollock, Caroline; Phillips, Sophy R. Mccully; Ellis, Jim R.; Papaconstantinou, Constantinos; Soldo, Alen; Keskin, Cetin; Knudsen, Steen Wilhelm; Gil De Sola, Luis; Serena, Fabrizio; Collette, Bruce B.; Nedreaas, Kjell; Stump, Emilie; Russell, Barry C.; Garcia, Silvia; Afonso, Pedro; Jung, Armelle B. J.; Alvarez, Helena; Delgado, Joao; Dulvy, Nicholas K.; Carpenter, Kent E..
Europe has a long tradition of exploiting marine fishes and is promoting marine economic activity through its Blue Growth strategy. This increase in anthropogenic pressure, along with climate change, threatens the biodiversity of fishes and food security. Here, we examine the conservation status of 1,020 species of European marine fishes and identify factors that contribute to their extinction risk. Large fish species (greater than 1.5 m total length) are most at risk; half of these are threatened with extinction, predominantly sharks, rays and sturgeons. This analysis was based on the latest International Union for Conservation of Nature (IUCN) European regional Red List of marine fishes, which was coherent with assessments of the status of fish stocks...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00416/52739/53608.pdf
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Concentrations of mercury and other trace elements in two offshore skates: sandy ray Leucoraja circularis and shagreen ray L. fullonica ArchiMer
Nicolaus, E. E. Manuel; Barry, Jon; Bolam, Thi P. C.; Lorance, Pascal; Marandel, Florianne; Phillips, Sophy R. Mccully; Neville, Suzanna; Ellis, Jim R..
Trace metal concentrations in muscle and liver tissues from two offshore species of skate were examined. Concentrations of mercury in muscle of Leucoraja circularis (n = 20; 23–110.5 cm total length, 157–490 m water depth) and L. fullonica (n = 24; 28.5–100 cm total length, 130–426 m water depth) were 0.02–1.8 and 0.04–0.61 mg kg− 1, respectively. Concentrations of both As and Hg increased with total length. Only the largest specimen had a concentration of Hg in muscle > 1.0 mg kg− 1. Data were limited for specimens > 90 cm long, and further studies on contaminants in larger-bodied skates could usefully be undertaken.
Tipo: Text Palavras-chave: Trace metals; Sandy ray; Shagreen ray; Bay of Biscay; Celtic Sea.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00397/50829/51592.pdf
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Contribution thématique DCSMM évaluation de l'état initial "pression et impact" - pression "Abrasion" dans la sous-région marine golfe de Gascogne DCSMM/EI/MMN ArchiMer
Lorance, Pascal.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16493/14005.pdf
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Contribution thématique DCSMM évaluation de l'état initial "pression et impact" - pression "Abrasion" dans la sous-région marine Manche, Mer du Nord salinité DCSMM/EI/MMN ArchiMer
Lorance, Pascal; Leonardi, Sophie.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16500/14009.pdf
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Contribution thématique DCSMM évaluation de l'état initial "pression et impact" - pression "Abrasion" dans la sous-région marine Méditerranée occidentale DCSMM/EI/MO ArchiMer
Lorance, Pascal; Leonardi, Sophie.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16501/14010.pdf
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Contribution thématique DCSMM évaluation de l'état initial "pression et impact" - pression "Abrasion" dans la sous-région marine mers Celtiques DCSMM/EI/MMN ArchiMer
Lorance, Pascal; Leonardi, Sophie.
Contribution thématique DCSMM évaluation de l'état initial "pression et impact" - pression "Abrasion" dans la sous-région marine mers Celtiques.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16498/14007.pdf
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Critères pour définir l’activité de pêche profonde ArchiMer
Lorance, Pascal.
La pêche profonde dans les eaux communautaires est actuellement définie par le règlement du Conseil 2347/2002 du 16 Février 2002 "Etablissant des conditions spécifiques d'accès aux pêcheries des stocks d'eau profonde et fixant les exigences y afférentes". Ce règlement défini les pêcheries profondes communautaires comme celles "qui sont amenés au cours de leurs activités de pêche à capturer des espèces énumérées dans la liste figurant à l'annexe I". Une seconde annexe est jointe à ce règlement, elle comporte des espèces qui doivent faire l'objet d'observations et récolte de données lors des pêches profondes mais leur capture n'implique pas la classification de l'activité comme pêche profonde. Cette définition légale, s'applique aux eaux européennes et aux...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00099/20985/18609.pdf
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Deriving blue ling abundance indices from industry haul by haul data ArchiMer
Lorance, Pascal; Pawlowski, Lionel; Trenkel, Verena.
A database of tallybooks, from skippers' own logbooks, provided by the French industry involved in deep-water fishing to the west of the British Isles was used to standardise blue ling Landings per Unit of Effort (LPUEs). The data covered the years 1992-2008 with more extensive data for the period 2000-2007. For each haul, landings by species, tow duration, depth and location were reported. Compared to EU logbooks, this database is on a haul by haul basis instead of being aggregated by fishing sub-trips combining hauls from the same day, ICES rectangle and gear. Moreover, it includes depth, which is a major factor for catch rates in deepwater fisheries. LPUEs were estimated from Generalised Additive Models (GAMs) with depth, vessel, statistical rectangle...
Tipo: Text Palavras-chave: Molva dypterygia; Abundance indices; Fishing strategy; Tweedie distribution.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00102/21330/18953.pdf
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Determining long-term changes in a skate assemblage with aggregated landings and limited species data ArchiMer
Trenkel, Verena; Marandel, Florianne; Lorance, Pascal.
Sustainable fisheries management requires the evaluation of the status of exploited populations and communities. Certain bycatch species such as rays are managed together which has led to overexploitation and conservations concerns for the most vulnerable ones. Traditional fisheries stock evaluation methods need species-specific input data while for ray species-specific landings have become available only recently in Europe. To overcome data limitations caused by grouped landings we developed a Bayesian multispecies biomass production model. In addition to the grouped landings the input data are shorter time series with species-specific information (landings and scientific biomass indices). Life history traits are used to define informative priors for...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00470/58214/60718.pdf
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Développement de la pêche martiniquaise - Mise en valeur des ressources démersales : des bancs du nord de la Guadeloupe, entre 100 et 300 m de profondeur autour de la Martinique ArchiMer
Battaglia, Andre; Guillou, Alain; Lorance, Pascal; Reynal, Lionel.
Le schéma général de développement du secteur de la pêche en Martinique vise a valoriser de nouveaux secteurs géographiques, il s'agit : - des tombants côtiers (100 à 300m et plus), - de la haute mer (espèces pélagiques), - des bancs du nord de la Guadeloupe, - du plateau guyanais, - à ces domaines pourront s’ajouter les ouvertures sur les autres pays de la Caraïbe grâce à des accords de pêche. Pour cela, les mesures mises en oeuvre ont consisté à promouvoir une pêche au large par la construction de navires de 9 à 11 mètres ("plans-pêche"). Cependant les objectifs fixés n'ont pu être atteints en raison des difficultés successives rencontrées par les plans-pêche pour lesquels plusieurs causes ont été évoquées, portant sur : - le mode de financement de...
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Ano: 1989 URL: http://archimer.ifremer.fr/doc/00069/18013/15541.pdf
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Does Presence of a Mid-Ocean Ridge Enhance Biomass and Biodiversity? ArchiMer
Priede, Imants G.; Bergstad, Odd Aksel; Miller, Peter I.; Vecchione, Michael; Gebruk, Andrey; Falkenhaug, Tone; Billett, David S. M.; Craig, Jessica; Dale, Andrew C.; Shields, Mark A.; Tilstone, Gavin H.; Sutton, Tracey T.; Gooday, Andrew J.; Inall, Mark E.; Jones, Daniel O. B.; Martinez-vicente, Victor; Menezes, Gui M.; Niedzielski, Tomasz; Sigurosson, Porsteinn; Rothe, Nina; Rogacheva, Antonina; Alt, Claudia H. S.; Brand, Timothy; Abell, Richard; Brierley, Andrew S.; Cousins, Nicola J.; Crockard, Deborah; Hoelzel, A. Rus; Hoines, Age; Letessier, Tom B.; Read, Jane F.; Shimmield, Tracy; Cox, Martin J.; Galbraith, John K.; Gordon, John D. M.; Horton, Tammy; Neat, Francis; Lorance, Pascal.
In contrast to generally sparse biological communities in open-ocean settings, seamounts and ridges are perceived as areas of elevated productivity and biodiversity capable of supporting commercial fisheries. We investigated the origin of this apparent biological enhancement over a segment of the North Mid-Atlantic Ridge (MAR) using sonar, corers, trawls, traps, and a remotely operated vehicle to survey habitat, biomass, and biodiversity. Satellite remote sensing provided information on flow patterns, thermal fronts, and primary production, while sediment traps measured export flux during 2007–2010. The MAR, 3,704,404 km2 in area, accounts for 44.7% lower bathyal habitat (800–3500 m depth) in the North Atlantic and is dominated by fine soft sediment...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00135/24650/22683.pdf
Registros recuperados: 61
Primeira ... 1234 ... Última
 

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