Consulta: subjectFacets:"Effort"
Registros recuperados: 5
Data/hora: 11/06/2024 01:23:29

Une procédure systématique pour le sous-échantillonnage des prélèvements de plancton
Provedor de dados: 5
Autores: Koutsikopoulos, Constantin; Petitgas, Pierre.
It is often necessary to sub-sample plankton samples even if the precision of the estimation is thereby decreased. A methodological optimization is looked for. The variance depends on the procedure of construction of the aliquot (strategy) and the number of individuals counted (effort). The sub-sampling effort is allocated in a general context of repartition of the total effort between sampling and sub-sampling. This effort depends on the time consumed by the sub-sampling procedure, the volume of the aliquot and the number of individuals counted. For the same effort, a systematic procedure for the construction of sub-samples is more precise than a random one because it travels through the entire sample and is thus less dependent on the spatial distribution...
Tipo: Text
Palavras-chave: Plancton; Sous-échantillonnage; Effort; Précision; Plankton; Sub-sampling; Effort; Precision.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00131/24259/22252.pdf

Optimal Selectivity and Effort Cost A Simple Bioeconomic Model with an Application to the Bay of Biscay Nephrops Fishery
Provedor de dados: 5
Autores: Macher, Claire; Boncoeur, Jean.
This article investigates the relationship between optimal gear selectivity and effort cost in the fishing industry We first show that optimal selectivity depends negatively on the level of effort cost, but that this relationship is not continuous. Optimal selectivity switches when real effort cost goes beyond a certain level, and this switch induces a non-marginal reduction in the level of fishing effort. In the second part of this article, we shoot, that the current level of real effort cost in the Nephrops fishery of the Bay of Biscay is far below the switch point, which makes high selectivity optimal. The discrepancy between optimal and current selectivity may be explained by the state of the fishery management and also by the fact that selectivity is...
Tipo: Text
Palavras-chave: Selectivity; Effort; Technical measure; Management tradeoff; Nephrops fishery; Bay of Biscay; Bio-economic model; Social and private benefits and costs; Fuel costs.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12232/9279.pdf

Atlas électronique web de la pêche palangrière réunionnaise
Provedor de dados: 5
Autores: Bourjea, Jerome; Evano, Hugues; Hoarau, Ludovic; Satra Le Bris, Catherine; Meillon, Julien; Saintilan, Alexandre; Goudard, Erwann; Ropert, Michel.
Cet atlas interactif de la pêcherie palangrière de l'océan Indien a été réalisé dans la suite du projet IOSSSESPADON. Il synthétise d’une part, l'historique de la pêche palangrière de l'océan Indien depuis les années 1950 (efforts de pêche et captures d'espadon – Xiphias gladius par période de 5 ans et par rectangle statistique de 5°) et d’autre part, l'évolution de l'activité de la flottille palangrière réunionnaise depuis 1994 (efforts de pêche, captures et rendements pour les principales espèces ciblées). Pour le volet relatif à la Réunion, les données sont présentées :  1- annuellement par rectangle statistique de 5° (1994 – 2014), 2- annuellement ou par trimestre par rectangle statistique de 1° -2006 – 2014).  Cet outil interactif permet une...
Tipo: Text
Palavras-chave: Atlas; Cartographie; Pêche palangrière; Statistiques de pêche; Capture; Effort; Rendement; Océan Indien; Espadon; Thon Germon; Thon Albacore; Thon obèse; Grands pélagiques.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00272/38327/36568.pdf

Reconciling single-species TACs in the North Sea demersal fisheries using the Fcube mixed-fisheries advice framework
Provedor de dados: 5
Autores: Ulrich, Clara; Reeves, Stuart A.; Vermard, Youen; Holmes, Steven J.; Vanhee, Willy.
Single-species management is a cause of discarding in mixed fisheries, because individual management objectives may not be consistent with each other and the species are caught simultaneously in relatively unselective fishing operations. As such, the total allowable catch (TAC) of one species may be exhausted before the TAC of another, leading to catches of valuable fish that cannot be landed legally. This important issue is, however, usually not quantified and not accounted for in traditional management advice. A simple approach using traditional catch and effort information was developed, estimating catch potentials for distinct fleets (groups of vessels) and metiers (type of activity), and hence quantifying the risks of over-and underquota utilization...
Tipo: Text
Palavras-chave: Advice; Demersal; Effort; Fcube; Mixed fisheries; North Sea; TACs.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00044/15491/12970.pdf

How to Promote Quality Perception in Wine Markets: Brand Advertising or Geographical Indication?
Provedor de dados: 31
Autores: Yue,   Chengyan; Marette,   Stephan; Beghin,   John C.
In the context of the wine industry, we investigate producers' choice between geographical indications and brand advertising to convey information to consumers. Producers also decide whether or not to select an effort level for improving the quality of their products. We show that if this effort level is selected, a producer will prefer to rely on brand advertising for promoting its products and setting up its own reputation. Despite allowing the cost of promotion to be shared, a geographical indication does not sufficiently reward the effort to improve quality. Finally, the selection of both instruments by producers is examined.
Tipo: Working or Discussion Paper
Palavras-chave: Brand advertising; Effort; Geographical indication; GI; Quality; Wine; Marketing.
Ano: 2006
URL: http://purl.umn.edu/18608