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Registros recuperados: 11
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Adaptive behaviour of fishers to external perturbations: simulation of the Tasmanian rock lobster fishery ArchiMer
Hamon, Katell; Frusher, Stewart; Little, L. Richard; Thebaud, Olivier; Punt, André E..
The rock lobster, Jasus edwardsii, lies on a global “hotspot” for climate change in the southeastern Australian state of Tasmania. The short-term effects of climate change are predicted to lead to an increasing exploitable biomass in the south and declining biomass in the north of the state. The future of the fishery is highly uncertain due to climate change, but also due to insecurities linked to the market conditions. The market for Tasmanian rock lobster is driven by the demand of a single market, China, which absorbs 75 % of the catch. This study examines how fishers can adapt to external perturbations that affect the social and economic viability of the fleet and the ecological dynamics of the stock. Three fleet dynamic models of increasing complexity...
Tipo: Text Palavras-chave: Tasmanian rock lobster; Fleet dynamics; Fishers behaviour; Climate change.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00171/28219/27542.pdf
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Catch-quota balancing in mixed-fisheries: a bio-economic modelling approach applied to the New Zealand hoki (Macruronus novaezelandiae) fishery ArchiMer
Marchal, Paul; Francis, Chris; Lallemand, Philippe; Lehuta, Sigrid; Mahevas, Stephanie; Stokes, Kevin; Vermard, Youen.
Managing adequately the exploitation of commercial species subject to technical interactions is a key step towards the ecosystem approach to fisheries. We evaluate here, using a bio-economic modelling approach building on the ISIS-Fish simulation platform, the relative impact of total allowable commercial catches (TACC) and of taxes applicable to over-quota landings (deemed value) on the sustainability of a selection of species exploited by the New Zealand hoki (Macruronus novaezelandiae) fishery. We investigate some aspects of the hoki mixed fisheries, consisting of four fleets and nineteen metiers, by considering the technical interactions between hoki and Southern hake (Merluccius australis). The dynamics of effort allocation were modelled using gravity...
Tipo: Text Palavras-chave: Fleet dynamics; New Zealand hoki fishery; Deemed value; Fisheries management.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11168/7521.pdf
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Cluster analysis of linear model coefficients under contiguity constraints for identifying spatial and temporal fishing effort patterns ArchiMer
Mahevas, Stephanie; Bellanger, Lise; Trenkel, Verena.
For fisheries management purposes, it is essential to take into account spatial and seasonal characteristics of fishing activities to allow a reliable assessment of fishing impact on resource. This paper presents a novel technique for describing spatial and temporal patterns in fishing effort. The spatial and seasonal fishing activity patterns of the French trawler fleet in the Celtic Sea during the period 1991–1998 were analysed by modelling fishing effort (fishing time) with generalised linear models. The linear model for fishing effort included fixed effects for both spatial (statistical rectangles) and temporal units (months). In addition, spatial correlations in any given month were modelled by an exponentially decreasing function. Temporal...
Tipo: Text Palavras-chave: Fleet dynamics; Allocation of Fishing effort; Spatial and seasonal pattern; Statistics for spatial data; Cluster analysis under contiguity constraints; Generalised linear model.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4302.pdf
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Comportement de pêche et gestion : l’exemple de la pêcherie pélagique du Golfe de Gascogne ArchiMer
Vermard, Youen.
In the current context of fisheries management, simulation models are required to support the evaluation of management scenarios. These models should include the key processes of the fishery system: stock dynamics, fleet dynamics, manager decision-making, and the interactions between these three elements. Most of the existing models have concentrated on the modeling of biological processes, population dynamics, and ecosystem interactions. However, a number of fisheries management failures could have resulted from a misunderstanding of fishers behavior rather than from limited knowledge of the status of fishery resources. It has for example been showed that in an exploited system, fishers’ spatial behavior influences the predicted outcomes of management...
Tipo: Text Palavras-chave: Dynamique de flottille; RUM; VMS; Évaluation de mesures de gestion; Fleet dynamics; Random Utility Model; VMS; Management strategy evaluation.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00001/11256/7799.pdf
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Evaluating deepwater fisheries management strategies using a mixed-fisheries and spatially explicit modelling framework ArchiMer
Marchal, Paul; Vermard, Youen.
Wehave used in this study a spatially explicit bioeconomic modelling framework to evaluate management strategies, building in both datarich and data-limited harvest control rules (HCRs), for a mix of deepwater fleets and species, on which information is variable. The main focus was on blue ling (Molva dypterygia). For that species, both data-rich and data-limited HCRs were tested, while catch per unit effort (CPUE) was used either to tune stock assessments, or to directly trigger management action. There were only limited differences between the performances of both HCRs when blue ling biomass was initialized at the current level, but blue ling recovered more quickly with the data-rich HCR when its initial biomass was severely depleted. Both types of HCR...
Tipo: Text Palavras-chave: Bioeconomic model; Catch per unit effort; Fleet dynamics; Harvest control rules; Management strategy evaluation; Mixed fisheries.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00151/26229/24330.pdf
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Exploring habitat credits to manage the benthic impact in a mixed fishery ArchiMer
Batsleer, J.; Marchal, Paul; Vaz, Sandrine; Vermard, Youen; Rijnsdorp, A. D.; Poos, J. J..
The performance of a combined catch quota and habitat credit system was explored to manage the sustainable exploitation of a mix of demersal fish species and reduce the benthic impacts of bottom trawl fisheries using a dynamic state variable model approach. The model was parameterised for the Eastern English Channel demersal mixed fishery using otter trawls or dredges. Target species differed in their association with habitat types. Restricting catch quota for plaice and cod had a limited effect on benthic impact, except when reduced to very low values, forcing the vessels to stay in port. Quota management had a minimal influence on fishing behaviour and hence resulted in a minimal reduction of benthic impact. Habitat credits may reduce the benthic impacts...
Tipo: Text Palavras-chave: Fleet dynamics; Dynamic state variable modelling; TAC; Total allowable catch; Mixed fisheries; Eastern English Channel; Plaice; Cod.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00418/52997/53997.pdf
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Fishing fleet typology, economic dependence, and species landing profiles of the French fleets in the Bay of Biscay, 2000-2006 ArchiMer
Daures, Fabienne; Rochet, Marie-joelle; Van Iseghem, Sylvie; Trenkel, Verena.
Thirty French fleets fishing primarily in the Bay of Biscay were defined based on techno-economic input criteria: i) 18 fishing gear or gear combinations ii) the location of fishing grounds visited during a year (<12 nautical miles from coast, beyond 12 nm or both) and iii) total vessel length (<20 m for trawlers and other gears <24 m). The fleets were then characterised in terms of horse power, economic dependence on a list of nine dominant commercial species (sole, Nephrops, sea bass, hake, monkfish, anchovy, cuttlefish, sardine and squid) and their contribution to the landings of these species from the Bay of Biscay. Most fleets derived the majority of their income from one or two among the nine species. Species dependencies changed little...
Tipo: Text Palavras-chave: Fishing methods; Fishing vessels; Fleet dynamics; Mixed fisheries; Catch distribution; Economy; Atlantic Ocean.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11172/7530.pdf
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Impact d’une obligation de débarquement sur les dynamiques couplées écosystème-pêcheurs : approche par modélisation individu-centrée appliquée à la Manche orientale ArchiMer
Bourdaud, Pierre.
The objective of this thesis was to anticipate the effects if the EU Landing Obligation (LO) implemented since the beginning of 2015 in the Eastern English Channel (EEC). To achieve these objectives, it was planned to: i) better understand seasonal spatial distribution of commercial species using on-board commercial vessels observation data, ii) compare them with the fine scale fishing effort distribution of EEC bottom otter trawlers (OTB), and iii) develop an individual-based model of fleet-dynamics, DSVM, to be integrated within the ecosystem model OSMOSE to simulate a LO. The usefulness of on-board observation data was proved for a main part of a species sample, using validation from the literature and a geostatistical indicator. Then the comparison of...
Tipo: Text Palavras-chave: Distribution spatiale; Saisonnalité; Données commerciales; Données de campagnes scientifiques; Manche Orientale; Effort de pêche; Assemblages d’espèces cibles; Obligation de débarquement; Modèle individu-centré; Dynamiques des flottilles; Spatial distribution; Seasonality; Commercial data; Survey data; Eastern English Channel; Fishing effort; Target species assemblages; Landing obligation; Individual-based model; Fleet dynamics.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00440/55135/56603.pdf
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Mixed fisheries management: protecting the weakest link ArchiMer
Batsleer, Jurgen; Poos, J. J.; Marchal, Paul; Vermard, Youen; Rijnsdorp, A. D..
North Sea cod Gadus morhua stock is outside safe biological limits, and total allowable catch (TAC) management has proved ineffective to rebuild the stock. The European Commission is considering the imposition of a discard ban to preserve vulnerable and economically important fish stocks. We explored the potential effects of a discard ban in mixed fisheries management using the French mixed fisheries in the Eastern English Channel as a model system. We examined in particular the performance of 2 different management scenarios: (1) individual quota management with a tolerance for discarding and (2) individual quota management in combination with a discard ban, using a dynamic state variable model. The model evaluates a time series of decisions taken by...
Tipo: Text Palavras-chave: Discard ban; TAC; Dynamic State Variable Modelling; Eastern English Channel; Cod; Gadus morhua; Mixed fisheries; Fleet dynamics.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24781/22834.pdf
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Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries ArchiMer
Marchal, Paul; Little, L. Richard; Thebaud, Olivier.
A simulation modelling approach is used to assess the respective performances of different regimes of quota allocation (fixed or transferable), quota ownership (owned or not by fishers), and taxation for catching fish above quota. The simulations account for a variety of fleet behaviours (ranging from fixed by tradition to dynamic economics-driven). The modelling framework is applied to the Channel flatfish mixed fisheries. Transferable quota allocation regimes would particularly benefit small netters and beam trawlers, which would achieve a profit of (sic)50-150 million without compromising the conservation of eastern Channel sole, but it could impair the sustainability of other stocks. If quota is owned by fishers, the least fishing-efficient fleet stops...
Tipo: Text Palavras-chave: Channel flatfish mixed fisheries; Fisheries management; Fleet dynamics; Individual quotas; Overquota landing tax; Plaice (Pleuronectes platessa); Sole (Solea solea).
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00044/15492/12971.pdf
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The relative weight of traditions, economics, and catch plans in New Zealand fleet dynamics ArchiMer
Marchal, Paul; Lallemand, Philippe; Stokes, Kevin.
We investigate the relative weights of catch plans expected profit, and traditions in fishers' decision-making For five New Zealand fleets subject to an individual transferable quota (ITQ) management regime. Metiers were defined for these fleets as a combination of bears. management units, and a targeting index (either target species or statistical area) A nested logit random utility model was Used to model the metier allocation of fishing, effort in relation to catch plans, expected profit, and Past fishing allocations. This study showed that traditions and catch plans appeared to be important determinants of fishers' behavior for these New Zealand fleets. The model developed in thiS study filled the data generally well and was also able to predict, in...
Tipo: Text Palavras-chave: Random Utility Model; New Zealand fisheries; Fleet dynamics; Catch plans; Individual Transferable Quotas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6418.pdf
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