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Registros recuperados: 14
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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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Aspects technologie pêche de la campagne JUVESU 99 ArchiMer
Meillat, Marc.
IFREMER's "Fishing Technology" team participated in the JUVESU99 campaign from 1 to 13 September. The equipment tested was the same as that from the SURFET99 campaign, a pelagic trawl with a surface area of 47.75 x 43.75 with netting of 500 metres of cables, 120-metre arms of equal length above and below, and a ballast of 40 kg to each wing tip The pelagic panels used were panels from the company TYBORON of "type 8" lent through the intermediary of the Kéroman company, Dock et Entrepôts Maritimes. The trawl's collection of balls consisted of a cluster of ten 11-litre balls on each upper wing tip, and a cluster of five 11-litre balls on each side of the square. The total collection of balls was therefore thirty 11-litre balls along the back rope of the...
Tipo: Text Palavras-chave: Gwen Drez; Fishing technology; Pelagic trawl; Fishing gear; Trawl survey; Gwen Drez; Technologie des pêches; Chalut pélagique; Engin de pêche; Campagne de chalutage.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-2647.pdf
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Development of a central database for European trawl survey data ArchiMer
Daan, N; De Boois, I; Emslie, D.c.; Fletcher, N.; Heessen, H; Larsen, L.i.; Lassen, H; Mahe, Jean-claude; Newton, A.w.; Patberg, W.; Peach, K.j.; Piet, G.j.; Sparholt, H.; Star, B; Storbeck, F.
Tipo: Text Palavras-chave: BTS; BITS; IBTS; CIEM; Chalutage; Base de données; BTS; BITS; IBTS; ICES; European waters; Trawl survey; Fish stock.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-2173.pdf
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Disentangling the effects of capture efficiency and population abundance on catch data using random effects models ArchiMer
Trenkel, Verena; Skaug, Hans.
We propose a random effects model for disentangling population abundance and capture efficiency effects on bottom-trawl catches. The spatial distribution of individual fish is assumed random leading to a Poisson distribution for the number of individuals in the trawl path (no schooling). Capture efficiency, i.e. the proportion of individuals in the trawl path being retained by the gear, is modelled as a random variable. We propose model extensions that include the effects of body size on haul efficiency. We applied the models to several species from the Celtic Sea groundfish community based on small-scale repetitive hauls. The resulting abundance estimates allowed us to study population abundance ratios; the estimated capture efficiencies were comparable...
Tipo: Text Palavras-chave: Trawl survey; Poisson distribution; Celtic Sea; Catchability; Abundance.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-828.pdf
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Efficiency of the bottom trawl used for the Mediterranean international trawl survey (MEDITS) ArchiMer
Fiorentini, Loris; Dremiere, Pierre-yves; Leonori, Iole; Sala, Antonello; Palumbo, Vito.
The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) compared with that of a typical Italian commercial trawl. The latter was chosen because it is commonly used by fishermen in the central Adriatic, where the experiment was conducted, and therefore appeared as the best possible sampler of the commercial species present in those areas. Moreover, this trawl is similar to the various trawls used for the Italian national survey programme (GRUND). Four fishing trips were conducted between 1996 and 1997 in different areas and seasons to sample different species. Each trip was conducted in the same fishing area. A codend cover mounted...
Tipo: Text Palavras-chave: Efficacité du chalut; Chalut de fond; Pêche expérimentale; Technologie des engins; Chalutage; Méditerranée; Trawl efficiency; Bottom trawls; Experimental fishing; Gear research; Trawl survey; Mediterranean.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00188/29877/28359.pdf
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Estimating end effects in trawl catches ArchiMer
Battaglia, Andre; Trenkel, Verena; Rochet, Marie-joelle.
The end effect in trawl catches is defined as the proportion of the fish catch taken during shooting and hauling of the net, a period excluded from that nominally referred to as haul duration. If important, this effect will lead to biased abundance estimates, because the swept area will be underestimated. An experimental survey was carried out to compare catch numbers obtained in standard research 30-min hauls with those from 0-min hauls, the latter referring to the trawl being hauled as soon as the trawl geometry stabilized on the seabed. Average catch ratios (0-min/30-min hauls) ranged from 0.05 (s.d. 0.06) for sole to 0.34 (s.d. 0.64) for hake, indicating that the end effect might be more important and more variable for highly mobile species. As a...
Tipo: Text Palavras-chave: Trawl survey; Bias; Abundance index.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/publication-1686.pdf
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Evaluation des ressources halieutiques de l'ouest de l'Europe (EVHOE) par campagnes de chalutages programmes : Deuxième phase : Distribution saisonnière et évaluation des ressources halieutiques du golfe de gascogne. ArchiMer
Ifremer, -.
Tipo: Text Palavras-chave: Campagne de chalutage; Biomasse; EVOHE; Indices d'abondance; Halieutics; Seasonal variations; Biscay bay; Trawl survey.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/rapport-2189.pdf
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Mission ORHAGO1, Mise au point d'un gréement de chaluts jumeaux pour les campagnes halieutiques ORHAGO ArchiMer
Vacherot, Jean-philippe; Bavouzet, Gerard.
The new ORHAGO campaigns, which aim to form a multi-year series of biological and ecological data, are relying on the use of twin trawls associated with a new type of rigging. The ORHAGO1 campaign should make it possible to make adjustments of the diverse elements of the fishing train in order to obtain an optimal configuration. This preliminary adjustment is indispensable for obtaining reliable data during ORHAGO campaigns. In order to do this, twin trawls of 25.15 metres, belonging to TMSI, were used jointly with the ship's panels (Morgère WS) and a clump specially developed for the occasion with the Morgère Company. In order to verify the correct behaviour of the device, the Scanmar setup monitoring system as well as Micrel tension and inclinometric...
Tipo: Text Palavras-chave: Clump; Trawl doors; Trawl survey; Twin trawls; Fishing technology; Clump; Panneaux; Campagne de chalutage; Chaluts jumeaux; Technologie des pêches.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-2651.pdf
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Modelled distributions of ten demersal elasmobranchs of the eastern English Channel in relation to the environment ArchiMer
Martin, Corinne; Vaz, Sandrine; Ellis, J. R.; Lauria, Valentina; Coppin, Franck; Carpentier, Andre.
Generalised Linear Models, combined with a Geographic Information System, were used to map the habitats of ten demersal elasmobranch taxa (five skates, four sharks and a stingray) in the eastern English Channel, based on an annual fishery-independent bottom trawl survey conducted each October, and covering 21 years. Habitat models showing mean density levels were developed for the most frequently occurring species, whilst binomial occurrence habitat models were built for less frequent species. The main predictors of elasmobranch habitats in the eastern English Channel were depth, bed shear stress and salinity, followed by seabed sediment type and temperature. Habitat maps highlighted contrasting habitat utilisation across species. Raja clavata, and to a...
Tipo: Text Palavras-chave: Channel Ground Fish Survey; Chondrichthyes; Elasmobranchii; GLM; Grande Ouverture Verticale; Trawl survey.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00086/19730/17478.pdf
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Scénarios d'aménagement des activités de pêche dans la bande cotière bretonne : rapport 2004 ArchiMer
Talidec, Catherine; Daures, Fabienne; Leblond, Emilie; Berthou, Patrick; Guyader, Olivier; Thebaud, Olivier; Peronnet, Isabelle; Boncoeur, J.; Curtil, O.; Martin, A.; Le Floc'H, P.; Travers, M.; Le Lec, G..
This document is the progress report, for the year 2004, of the research programme "Scenarios for Development of Fishing Activity in the Breton Coastal Strip". This programme, co-financed by the Brittany Region within the framework of the XII State/Regional Planning Contract, teams up scientific partners from IFREMER, ENSAR, and UBO (CEDEM). This report consists of four parts: 1. Introduction of the Breton fishing fleet, its characteristics, its activity and its recent history 2. Spatial management of fishing economic activity in the Breton coastal strip 3. Measuring of economic results of Breton professional fishing: Comparison of methods based on accounting data and local surveys 4. Assessment of the economic weight of professional fishing: analysis of...
Tipo: Text Palavras-chave: Allotments; Trawl survey; Database; Spatial assessment; Coastal fishing; Brittany; Cantonnement; Chalutage; Enquêtes; Bases de données; Gestion spatiale; Pêche cotière; Bretagne.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-2263.pdf
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Spatiotemporal abundance pattern of deep-water rose shrimp, Parapenaeus longirostris, and Norway lobster, Nephrops norvegicus, in European Mediterranean waters ArchiMer
Sbrana, Mario; Zupa, Walter; Ligas, Alessandro; Capezzuto, Francesca; Chatzispyrou, Archontia; Follesa, Maria Cristina; Gancitano, Vita; Guijarro, Beatriz; Isajlovic, Igor; Jadaud, Angelique; Markovic, Olivera; Micallef, Reno; Peristeraki, Panagiota; Piccinetti, Corrado; Thasitis, Ioannis; Carbonara, Pierluigi.
The main characteristics concerning the distribution of two of the most important decapod crustaceans of commercial interest in the Mediterranean Sea, the deep-water rose shrimp, Parapenaeus longirostris, and the Norway lobster, Nephrops norvegicus, are studied in the European Mediterranean waters. The study is based on data collected under the MEDITS trawl surveys from 1994 to 2015 from the Gibraltar Straits to the northeastern Levantine Basin (Cyprus waters). The observed differences can be interpreted as different responses to environmental drivers related to the differing life history traits of the two species. In fact, N. norvegicus is a long-living, benthic burrowing species with low growth and mortality rates, while P. longirostris is an epibenthic,...
Tipo: Text Palavras-chave: Nephrops norvegicus; Parapenaeus longirostris; Distribution; Trawl survey; Mediterranean Sea.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60052/63331.pdf
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Spatio-temporal patterns of macrourid fish species in the northern Mediterranean Sea ArchiMer
García-ruiz, Cristina; Hidalgo, Manuel; Carpentieri, Paolo; Fernandez-arcaya, Ulla; Gaudio, Palma; González, Maria; Jadaud, Angelique; Mulas, Antonello; Peristeraki, Panagiota; Rueda, José Luis; Vitale, Sergio; D’onghia, Gianfranco.
The present study describes for the first time the spatial distribution of five macrourid species throughout the Mediterranean Sea and analyses depth, geographical and time-related trends regarding their abundance, biomass and mean fish weight. The data were collected as part of the MEDITS annual bottom trawl survey carried out by several European Mediterranean countries from 1994 to 2015, using the same standardized gear and sampling protocol. The most represented species in terms of abundance and biomass was Coelorinchus caelorhincus. The bathymetric trend was different for each species. The shallowest occurring species was C. caelorhincus, followed by Hymenocephalus italicus and Nezumia sclerorhynchus, while Nezumia aequalis and Trachyrincus scabrus...
Tipo: Text Palavras-chave: Macrourids; Mediterranean; Bathymetric distribution; Geographic distribution; Spatio-temporal trends; Deep-sea; Trawl survey.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60057/63337.pdf
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The MEDITS trawl survey specifications in an ecosystem approach to fishery management ArchiMer
Spedicato, Maria Teresa; Massuti, Enric; Merigot, Bastien; Tserpes, George; Jadaud, Angelique; Relini, Giulio.
The MEDITS programme started in 1994 in the Mediterranean with the cooperation among research institutes from four countries: France, Greece, Italy and Spain. Over the years, until the advent of the European framework for the collection and management of fisheries data (the Data Collection Framework. DCF), new partners from Slovenia, Croatia. Albania, Montenegro, Malta and Cyprus joined MEDITS. The FAO regional projects facilitated the cooperation with non-European countries. MEDITS applies a common sampling protocol and methodology for sample collection, data storage and data quality checks (RoME routines). For many years, MEDITS represented the most important data source supporting the evaluation of demersal resources by means of population and community...
Tipo: Text Palavras-chave: Demersal resources; Trawl survey; Sampling; Mediterranean.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00600/71216/69592.pdf
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Towards an ecosystem approach to fisheries management (EAFM) when trawl surveys provide the main source of information ArchiMer
Cotter, John; Petitgas, Pierre; Abella, Alvaro; Apostolaki, Panayiota; Mesnil, Benoit; Politou, Chrissi-yianna; Rivoirard, Jacques; Rochet, Marie-joelle; Spedicato, Maria Teresa; Trenkel, Verena; Woillez, Mathieu.
Ideas and considerations are put forward for managing fisheries and marine populations using primarily trawl surveys to supply biological and spatial indicators of the state of stocks, and to permit catch per unit effort (CPUE)-based assessments. Trawl surveys seldom allow absolute estimates of fish population sizes but, if appropriately located, timed, and designed, can provide a broad range of information about catchable fish species and the ecosystem that supports them. This information may be more conducive to sustainable management of fisheries than the traditional focus on the abundances of selected stocks. The paper first briefly proposes how survey-based methods might supplement existing fishery-dependent stock assessments, as would be necessary...
Tipo: Text Palavras-chave: Fishing effort indicator; Fisheries independent assessment; Survey based stock assessment; Spatial indicator; State indicator; Trawl survey; Fisheries management.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6691.pdf
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