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Registros recuperados: 18
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Adult-mediated connectivity and spatial population structure of sardine in the Bay of Biscay and Iberian coast ArchiMer
Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire; Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe; Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres.
This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000 to 2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and...
Tipo: Text Palavras-chave: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00465/57661/59856.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 natural mortality of Bay of Biscay anchovy from survey population and biomass estimates ArchiMer
Uriarte, Andres; Ibaibarriaga, Leire; Pawlowski, Lionel; Masse, Jacques; Petitgas, Pierre; Santos, Maria; Skagen, Dankert.
La fermeture de la pêche de l’anchois (Engraulis encrasicolus) du Golfe de Gascogne entre 2005 et 2010, en raison de la faible biomasse du stock, a été une opportunité pour estimer la mortalité naturelle à partir de données de campagnes halieutiques issues de l’observation de la présence d’oeufs (DEPM) et de mesures acoustiques, utilisées pour l’évaluation de cette population depuis 1987. En considérant que la mortalité naturelle est constante au cours du temps et que la capturabilité des deux campagnes est identique pour tous les âges, la mortalité naturelle peut être estimée par des modèles log-linéaires appliquées aux séries temporelles de nombres aux âges issues des campagnes, et par des modèles d’évaluations de stock prenant en compte la saison....
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00334/44510/45923.pdf
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Characterization of food web structure of the upper continental slope of the Celtic Sea highlighting the trophic ecology of five deep-sea fishes ArchiMer
Kopp, Dorothee; Robert, Marianne; Pawlowski, Lionel.
In marine ecosystems, the study of trophic relationships has extensively benefited from the development of stable isotope analyses (SIA) as dietary tracers. SIA are particularly useful in elucidating the structure of deep sea food webs given the constraints involved in obtaining gut-content data from deep trawling. We used carbon and nitrogen stable isotope analyses and Stable Isotope Bayesian Ellipses in R (SIBER) and Stable Isotope Analysis in R (SIAR) routines, to determine the trophic ecology of five deep-sea fishes from the upper continental slope of the Celtic Sea. SIA made it possible to deduce some general tendencies in food-web structure and species trophic interactions and confirmed diet determined by gut-content analysis for the same species, in...
Tipo: Text Palavras-chave: Competition; Feeding habits; Mixing models; Stable isotope.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00410/52138/52940.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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Effect of discards on roundnose grenadier stock assessment in the Northeast Atlantic ArchiMer
Pawlowski, Lionel; Lorance, Pascal.
In the Northeast Atlantic fishery for roundnose grenadier Coryphaenoides rupestris, discards account for about 30% of the catch in weight. Data on discards are scarce; however, length distributions and discard rates appear to be relatively stable from year to year. In contrast, landings data available since 1990 show that the average pre-anal fin length has decreased from 20.7 cm in 1990 to 15.2 cm in 2008, resulting in a 58% reduction of the mean individual weight (850 g in 2008) and an increasing occurrence of overlapping class sizes between landings and discards in recent years. For stock assessment, the method of separable virtual population analysis (SVPA) was used. However, because of the lack of discard data for many of the years covered by the...
Tipo: Text Palavras-chave: Stock assessment; Fishing effort; Discards; Time series; Macrouridae; Coryphaenoides rupestris; Atlantic Ocean.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11175/7527.pdf
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Evaluation des ressources démersales du plateau insulaire martiniquais ArchiMer
Froehlicher, Hermione; Pawlowski, Lionel; Weiss, Jerome; Reynal, Lionel; Thouard, Emmanuel.
Cette étude a pour but de déterminer l’état des ressources ciblées par les pêcheries démersales, majoritairement artisanales, exerçant sur le plateau insulaire martiniquais. Les espèces ciblées par ces pêcheries sont nombreuses (56 groupes d’espèces) et principalement capturées à la nasse. Cette étude se focalise sur les 12 groupes d’espèces principaux en termes de volume débarqué, valeur et nombre de marées effectuées. La courte série temporelle (11 années d'échantillonnage) et les données disponibles (CPUE et volumes de captures) imposent d'utiliser les méthodologies associées aux stocks à données limitées : tendance sur indices de biomasse et modèle de production. Ces deux méthodes sont confrontées dans cette évaluation. L’approche globale est avec un...
Tipo: Text Palavras-chave: Martinique; Évaluation de stock; Stock à données limitée; Modélisation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00595/70677/71784.pdf
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Evolution spatio-temporelle de la condition, de la structure en taille et en âge de la sardine Atlantique ArchiMer
Veron, Matthieu; Lebigre, Christophe; Bertignac, Michel; Doray, Mathieu; Duhamel, Erwan; Huret, Martin; Pawlowski, Lionel.
Peu de modèles d'évaluation de stock intègrent une description fine des processus biologiques régissant les populations exploitées par la pêche au sein des écosystèmes. Ce manque est particulièrement regrettable dans le cas des petits pélagiques dont la dynamique est fortement influencée par les conditions environnementales. En effet, la pêche et les fluctuations environnementales et climatiques impactent fortement la dynamique de population de la sardine du golfe de Gascogne. Pour comprendre la dynamique de cette population au sein de l'écosystème et les effets des pêcheries, il est donc nécessaire d'identifier et de caractériser cet ensemble de pressions.   Afin d'améliorer la gestion et le suivi de la dynamique de ce stock, le développement d'un modèle...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00410/52133/52842.pdf
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Fiche d'évaluation de fin de campagne : EVHOE 2012 ArchiMer
Pawlowski, Lionel; Salaun, Michele; Leaute, Jean-pierre.
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00127/23847/21774.pdf
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Integration of discards in the roundnose grenadier stock assessment in ICES division Vb, subaera VI, VII ArchiMer
Pawlowski, Lionel; Lorance, Pascal.
We present a series of exploratory stock assessments for roundnose grenadier (Coryphaenoides rupestris) from estimates of catch data based on information and assumption of discards and landing statistics. It is a common practice to consider landings data as a substitute of catch data to perform stock assessments. When a significant portion of the catch is discarded, this assumption is likely to be misleading as assessment methods will provide underestimated stock size.
Tipo: Text Palavras-chave: Abundance; Deep fishing; Discards; Stock assessment; Roundnose grenadier; Abondance; Pêche profonde; Rejets; Évaluation de la ressource; Grenadier de roche.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/rapport-7440.pdf
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Investigating feeding ecology of two anglerfish species, Lophius piscatorius and Lophius budegassa in the Celtic Sea using gut content and isotopic analyses ArchiMer
Issac, Pierre; Robert, Marianne; Le Bris, Hervé; Rault, Jonathan; Pawlowski, Lionel; Kopp, Dorothee.
We used stable isotope ratio and gut content analyses to determine and compare the feeding ecology of two commercially important predator species, Lophius piscatorius and Lophius budegassa in the Celtic sea, where data concerning their trophic ecology remain sparse. This study included two areas and two size-classes, showing that anglerfish in the Celtic sea are mainly piscivorous top predators as observed in other marine waters. However, a substantial part of the diet of the fish in the small size classes consists of benthic macro-invertebrates, mainly Crustaceans. Despite the common knowledge that they are opportunistic predators that display a low degree of prey selectivity, our results suggest that the two species have different trophic niches when...
Tipo: Text Palavras-chave: Lophius; Gut content; Stable isotopes; Trophic niche; Trophic segregation; Top predator.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00395/50614/51326.pdf
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Rejets de cabillaud observés sur les chalutiers opérant en Manche Est - mer du Nord et en mer Celtique ArchiMer
Dube, Benoit; Pawlowski, Lionel; Biseau, Alain.
L’étude présentée est une analyse des informations recueillies en 2011 dans le cadre du programme Obsmer en Manche Est (Division CIEM VIId) et mer du Nord (Zone IV), ainsi qu’en mer Celtique sur les chalutiers de fond. Elle complète le précédent document (juin 2011) qui présentait l’analyse des observations des captures 2009-2010 en mer du Nord – Manche Est. Ce document étend l’analyse à la pêcherie française de mer Celtique.
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00110/22172/19828.pdf
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Research for Pech Committee - Sardine fisheries: Resource Assessment and Social and Economic situation ArchiMer
Silva, Alexandra; Moreno, Ana; Riveiro, Isabel; Santos, Begoña; Pita, Cristina; Garcia Rodrigues, Joao; Villasante, Sebastian; Pawlowski, Lionel; Duhamel, Erwan.
This study describes fisheries, stock status, ICES advice and management measures for the Northern and Southern sardine stocks in EU Atlantic waters. Information on sardine biology and ecology is provided for a better understanding of stock development. Social and economic dimensions are addressed for sardine fisheries in France, Spain and Portugal. The study provides recommendations to improve knowledge on the species and indicates management measures which might be considered for the sustainability of the fisheries.
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00300/41109/40280.pdf
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Situation en 2011 des ressources exploitées par les flottilles françaises ArchiMer
Biseau, Alain; Bellail, Robert; Bertignac, Michel; Biais, Gerard; Bigot, Jean-louis; Bouche, Ludovic; Bourjea, Jerome; Caro, Anthony; De Casamajor, Marie-noelle; Caill-milly, Nathalie; Drogou, Mickael; Duhamel, Erwan; Fifas, Spyros; Foucher, Eric; Fromentin, Jean-marc; Jadaud, Angelique; Lampert, Luis; Laurans, Martial; Lissardy, Muriel; Lorance, Pascal; Mahe, Jean-claude; Mahe, Kelig; Masse, Jacques; Morandeau, Gilles; Pawlowski, Lionel; Poisson, Francois; Reynal, Lionel; Roos, David; Verin, Yves; Vermard, Youen; Vigneau, Joel.
Ce document présente l'état des principaux stocks exploités par les flottes françaises en termes de mortalité par pêche et de biomasse de reproducteurs. La situation fin 2010 (début 2011) par rapport aux points de référence (de précaution et Fmsy) est indiqué lorsque les indicateurs sont estimés et que les références sont définies. Les grandes tendances en matière d'évolution des mortalités et biomasses sont également indiquées.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00035/14656/11956.pdf
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Standardizing blue ling landings per unit effort from industry haul-by-haul data using generalized additive models ArchiMer
Lorance, Pascal; Pawlowski, Lionel; Trenkel, Verena.
Haul-by-haul data derived from skippers' personal logbooks, from the French deep-water fishery to the west of the British Isles, were used to calculate standardized blue ling (Molva dypterygia) landings per unit effort (lpue) for the period 2000-2008. Lpue values were estimated using generalized additive models with depth, vessel, statistical rectangle, area, and year as explanatory variables. Because of their statistical distribution, landings were modelled by a Tweedie distribution, which allows datasets to contain many zeros. To investigate how to track stock trends reliably, lpue values were estimated in five areas for different subsets of the data. The subsets consisted of hauls during the spawning season (when blue ling aggregate), outside the...
Tipo: Text Palavras-chave: Abundance indices; Fishing strategy; GAM; Molva dypterygia; Tallybook.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00016/12713/9647.pdf
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Testing spatial heterogeneity with stock assessment models ArchiMer
Jardim, Ernesto; Eero, Margit; Silva, Alexandra; Ulrich, Clara; Pawlowski, Lionel; Holmes, Steven J.; Ibaibarriaga, Leire; De Oliveir, Jose A. A. A.; Riveiro, Isabel; Alzorriz, Nekane; Citores, Leire; Scott, Finlay; Uriarte, Andres; Carrera, Pablo; Duhamel, Erwan; Mosqueira, Iago.
This paper describes a methodology that combines meta-population theory and stock assessment models to gain insights about spatial heterogeneity of the meta-population in an operational time frame. The methodology was tested with stochastic simulations for different degrees of connectivity between sub-populations and applied to two case studies, North Sea cod (Gadus morua) and Northeast Atlantic sardine (Sardina pilchardus). Considering that the biological components of a population can be partitioned into discrete spatial units, we extended this idea into a property of additivity of sub-population abundances. If the additivity results hold true for putative sub-populations, then assessment results based on sub-populations will provide information to...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00422/53385/54236.pdf
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The Best Way to Reduce Discards Is by Not Catching Them! ArchiMer
Reid, David G; Calderwood, Julia; Afonso, Pedro; Bourdaud, Pierre; Fauconnet, Laurence; Gonzalez-irusta, José Manuel; Mortensen, Lars O; Ordines, Francesc; Lehuta, Sigrid; Pawlowski, Lionel; Plet-hansen, Kristian S; Radford, Zachary; Robert, Marianne; Rochet, Marie-joelle; Rueda, Lucia; Ulrich, Clara; Vermard, Youen.
Under the Landing Obligation (LO) fishers will need to reduce or land fish that were previously discarded. In this chapter we look at how they might be able to do that by summarising a number of studies conducted in various European regions. We start by describing a series of “challenge” trials where fishers tried to reduce their discards by whatever (legal) means they thought best. In some cases, they were able to reduce unwanted catches, in others they were less successful. We also interviewed fishers not involved in the trials to ask them what they thought they could do. We explore their approaches which generally fell into three categories: more selective gear; tactical and strategic changes; and management changes. Scientific data (surveys, landings,...
Tipo: Text Palavras-chave: Challenge trials; Decision support tools; Discard avoidance; Fine scale mapping; Fish distribution; Fishers; Fishing strategies; Hot-spot maps.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00473/58428/61004.pdf
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What is the added value of including fleet dynamics processes in fisheries models? ArchiMer
Marchal, Paul; De Oliveira, Jose A. A.; Lorance, Pascal; Baulier, Loic; Pawlowski, Lionel.
We develop a spatially and seasonally explicit bioeconomic model with three fleet dynamics processes built in endogenously. The model has been applied to the large French trawlers harvesting a medium-depth demersal stock, North Sea saithe (i.e., pollock, Pollachius virens), and a mix of deepwater species over a 10-year period (1999-2008), and the predictions have been contrasted with observations. The best overall fit was achieved where effort allocation was determined to be 80% by traditions and 20% by economic opportunism and where harvest efficiency increased by 8% a year. With this fleet dynamics parameterization, annual trends in fishing effort and profit were well reproduced by the model over the whole time period. Time series of the observed fishing...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00151/26227/24329.pdf
Registros recuperados: 18
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