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| Registros recuperados: 14 | |
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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 14 | |
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