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Registros recuperados: 7
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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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Evolution de l'activité des flottilles industrielles étrangères ciblant les petits pélagiques dans la zone mauritanienne de 1991 à 1999. Analyse spatio-temporelle des captures des sardinelles. OceanDocs
Ould Taleb Ould Sidi, M.M..
L'utilisation des Analyses Factorielles des Correspondances (AFC) suivie d'une classification hiérarchique pour étudier les captures des petits pélagiques entre 1991 et 1999 dans la zone économique exclusive mauritanienne, a permis de mettre en évidence les déterminants de la répartition des stratégies de pêche au niveau de cette zone pour les flottilles les plus intéressantes. Les facteurs comme l'année, les secteurs, la saison et la flottille sont ceux qui expliquent le mieux les variations des captures observées. Les captures augmentent et se diversifient sous l'effet des changements de stratégie et l'arrivée de nouvelles flottilles dans la zone. Les captures des sardinelles ont été multiplié par 3 suite à l'arrivée des flottilles de l'Union européenne...
Tipo: Theses and Dissertations Palavras-chave: Stratégie de pêche; Espèces de petits pélagiques; CFA; Variations spatio-temporelles; ZEE mauritanienne; Space-time variations; Fishing strategy; Small pelagic species; AFC; Fishing fleet; Pelagic fisheries.
Ano: 2000 URL: http://hdl.handle.net/1834/224
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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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Interactions between fishing strategies of nephrops trawlers in the Bay of Biscay and Norway lobster diel activity patterns ArchiMer
Trenkel, Verena; Rochet, Marie-joelle; Mahevas, Stephanie.
Norway lobster, Nephrops norvegicus (L.) was found to show diel activity patterns with more individuals outside their burrows at dawn and dusk in the Bay of Biscay in August 2004 and catchabilities were higher at these times. Using data from an onboard observer programme of Nephrops trawlers in 2002-2005, we investigated whether the expected variability in catchability was visible in commercial catches. Catch numbers per haul varied spatially and between months but no signal for diel variations was found. Fishing strategies developed by the Nephrops trawlers had several components. On a seasonal level they started around sunrise. On a haul level, haul duration decreased from haul to haul, with the longest hauls taking place at the time of highest...
Tipo: Text Palavras-chave: Time of day; Fishing strategy; Diel activity patterns; Catchability.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2007/publication-2618.pdf
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Risk versus economic performance in a mixed fishery ArchiMer
Gourguet, Sophie; Thebaud, Olivier; Dichmont, C.; Jennings, S.; Little, L. R.; Pascoe, S.; Deng, R. A.; Doyen, L..
Balancing bio-economic risks and high profit expectations is often a major concern in fisheries management. We examine this trade-off in the context of the Australian Northern Prawn Fishery (NPF). The fishery derives its revenue from different prawn species with different dynamics and recruitment processes. A multi-species bio-economic and stochastic model is used to examine the trade-offs between mean profitability of the fishery and its variance, under a range of economic scenarios, fishing capacities and distributions of fishing effort across the various sub-fisheries that comprise the NPF. Simulation results show that the current fishing strategy diversifying catch across sub-components of the fishery entails a compromise between expected performance...
Tipo: Text Palavras-chave: Bio-economic modelling; Uncertainty; Risk-performance trade-offs; Fishing strategy; Northern Prawn Fishery.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00216/32775/31320.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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Stratégie d'exploitation des zones de pêche d'un chalutier hauturier du Guilvinec ArchiMer
Pichon, Jacques.
The Bigouden region's fishing is significant by the tonnage landed, the quality of the production and high sales price. That makes Guilvinec "an ideal laboratory for analysing the fish business in all its complexity, from the catch to marketing". The fishermen of the Guilvinec district are spread out in 3 ports: Guilvinec, Loctudy, and Saint Guénolé. Each port has its speciality (example: Guilvinec's speciality is monkfish). Each fleet is composed of dinghies, coastal trawls, seafaring fish trawls, and seafaring crayfish trawls. The subject chosen for this master's theses is the study of the fishing strategy of a seafaring ship, the Kerflous. This work was difficult because it reached into the sphere of the professional secret. The Kerflous works at the...
Tipo: Text Palavras-chave: Celtic sea; Trawler; Fishing strategy; Fishing zones; Product quality; Bigouden; Guilvinec; Brittany; Chalutier; Mer Celtique; Stratégie de pêche; Zones de pêche; Qualité; Guilvinec; Bigouden.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/these-2560.pdf
Registros recuperados: 7
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