From single-species advice to mixed-species management: taking the next step

Vinther, Morten; Reeves, Stuart A.; Patterson, Kenneth

doi:10.1016/j.icesjms.2004.08.018

Cited by 64 publications

(48 citation statements)

References 9 publications

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“…2008/949/EC). The main reason for using the trip is the need to assign each of them to a specific metier or fishing tactic, in order to define and implement the management measures included under the fleet-based approach and the ecosystem approach to fisheries (Vinther et al, 2004;ICES, 2007).…”

Section: Datamentioning

confidence: 99%

Deep-water fishing tactics of the Spanish fleet in the Northeast Atlantic. Seasonal and spatial distribution

et al. 2011

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SUMMARY:The classification and identification of all the Spanish fishing activity targeting deep-sea species was conducted using a non-hierarchical classification technique designed for large matrices (CLARA). Otter trawl and set longlines were the main gears used in deep-sea ecosystems. The otter trawl fleet conducted 3 deep-sea fishing tactics. The only otter trawl fishing tactic targeting deep-sea species was that working in the VI ICES Division and targeting Alepocephalus baiirdi. The other 2 otter trawl fishing tactics targeted shallower shelf demersal resources, deep-sea species being secondary (Phycis blennoides). The longline fleet carried out 7 fishing tactics targeting deep-sea species (Molva spp.; deep water sharks; P. blennoides; Pagellus bogaraveo; and Trichiuridae) and 2 fishing tactics targeting Conger conger, which perform as deepsea fishing tactics in the narrow continental shelf area. This classification, together with knowledge regarding their seasonal performance and spatial distribution, may help to design fisheries sampling protocols and to improve the management of these fleets, thus reducing their impact on deep-sea habitats.Keywords: Northeast Atlantic, métiers, fisheries, deep sea, trawl, longline, multivariate. RESUMEN: Pesquerías españolas de gran profundidad en el Atlántico Nordeste. Estacionalidad y distribución espacial. -Para la clasificación e identificación de todas las pesquerías españolas que actúan sobre especies de gran profundidad se ha utilizado una técnica de cluster no jerárquica diseñada para grandes matrices (CLARA). El arrastre con puertas y el palangre de fondo fueron los aparejos más importantes. Solamente la táctica pesquera de arrastre con puertas desarrollada en la División VI del ICES está dirigida a especies de profundidad, siendo la especie objetivo Alepocephalus baiirdi. Las otras dos tácticas pesqueras con arrastre de puertas son mixtas, teniendo como objetivo especies típicas de plataforma, y teniendo las especies de profundidad como secundarias (Phycis blennoides). La flota de palangre desarrolla siete tácticas pesqueras dirigidas a especies de profundidad: Molva spp.; tiburones de profundidad; P. blennoides; Pagellus bogaraveo; Trichiuridae; y dos pesquerías dirigidas a Conger conger, que se comportan como tácticas pesqueras de profundidad en las zonas de plataforma estrecha. Esta clasificación junto con el conocimiento acerca de su comportamiento estacional y espacial, ayudarán al diseño de los protocolos de muestreo de estas pesquerías así como a la mejora de la gestión de estas pesquerías contribuyendo a una reducción de su impacto en los hábitats profundos.

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Section: Datamentioning

confidence: 99%

Deep-water fishing tactics of the Spanish fleet in the Northeast Atlantic. Seasonal and spatial distribution

et al. 2011

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“…From a management perspective, single-stock focus disregards technical interactions in fisheries, where 2 or more stocks are captured jointly, possibly leading to greater risk of overharvesting less productive stocks or differential recovery rates following harvesting restrictions (e.g. Paulik et al 1967, Vinther et al 2004, Murawski 2010. It also does not take full advantage of the potentially greater simplicity of stock-aggregate management and possible greater interannual predictability of the total amount of catch in mixed-stock fisheries (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assembly rules for aggregate-species production models: simulations in support of management strategy evaluation

Gaichas¹,

Gamble²,

Fogarty³

et al. 2012

Mar. Ecol. Prog. Ser.

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Ecosystem-based fisheries management (EBFM) emphasizes sustainability at multiple levels of organization beyond single target species. Therefore, biological reference points (BRPs) for aggregated groups are required, which optimize yields while preventing overexploitation of individual species. We evaluate the tradeoffs between yield and biodiversity objectives for a wide range of aggregation strategies using multispecies surplus production models and comparing 2 simulated fish communities. We simulated population trajectories with an operating model detailing predation and competitive interactions for all individual species within each community, and with additional stochastic environmental variability for one community. Species trajectories were then aggregated by functional feeding guild, taxonomy, habitat association, size class, and at the entire community level. We estimated production parameters and BRPs (e.g. maximum sustainable yield, MSY) using a simple assessment model applied to each aggregated time series, then we applied the MSY fishing rates to each simulated community as alternative fishing strategies and compared equilibrium biomass and yield under each strategy. We were able to define multi-species reference points to meet both yield and biodiversity objectives across full system, taxonomic, habitat, feeding, and size-based aggregations. Species complexes were best able to meet both objectives when species with broadly similar productivity, environmental sensitivity and species interactions were aggregated into the complex. The impacts of simulated environmental variability on BRPs were substantial for certain species and aggregates, so including the combined impacts of environmental variation and species interactions in precautionary reference points appears critical to EBFM.

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“…This approach, however, would imply some extension of advice-giving beyond the scientific boundary into political territory. It would require in particular to prioritize management targets of some stocks in detriment of others, and also perhaps to specify explicitly the fleets, and possibly the countries, for which management action would be required in priority (Vinther et al 2004;Reeves et al 2008). …”

Section: Discussionmentioning

confidence: 99%

“…It is perhaps also worth noting that the EU has made significant steps towards the provision of mixed fisheries TACs (EC 2002b;EC 2006). This approach, which aims at improving the consistency between catches and TACs, has been supported by scientific works around the definition of métiers and the development of models allowing the integration of technical interactions in stock forecasts (Laurec et al 1991;ICES 2003;Vinther et al 2004).…”

Section: Conservation Measuresmentioning

confidence: 99%

A comparative review of the fisheries resource management systems in New Zealand and in the European Union

Marchal

Lallemand

Stokes

et al. 2009

Aquat. Living Resour.

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-This review aims at comparing the fisheries management systems existing in New Zealand and in the European Union. The involvement of stakeholders at all stages of the management process is generally more transparent and better established in New Zealand than in the EU. Both systems aim at achieving an adequate balance between sustainability and utilisation and consider the precautionary approach as a founding principle. The social objectives are probably more explicit in the EU management system. In New Zealand, B MSY is a legal management target for all stocks in the quota management system (QMS), but management strategies were poorly explicit until most recently. In the EU, there have not been any legal management targets or strategies until 1999. Since 1999, a number of multi-annual recovery and management plans have been established, including both management targets and strategies. Both management systems include conservation and access regulation measures. The EU management measures aim at regulating fisheries outputs and inputs, and discarding is tolerated. New Zealand management is almost exclusively output-based, and discarding practices are banned. In the EU, while individual quotas (IQs) are implicit in several countries, there is no consistent pattern across Member States for allocating TACs. In New Zealand, individual transferable quotas (ITQs) are implemented, and some flexibility in catch-quota balancing is provided by a carry-over allowance and the payment of a landing tax, the deemed value, for every fish landed above quota. If rights-based management were introduced in the EU based on, e.g., the New Zealand model, we suggest that concentration rules be set in accordance with the social objectives of the Common Fisheries Policy, and also that the deemed value should be set based on science and economics.

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From single-species advice to mixed-species management: taking the next step

Cited by 64 publications

References 9 publications

Deep-water fishing tactics of the Spanish fleet in the Northeast Atlantic. Seasonal and spatial distribution

Deep-water fishing tactics of the Spanish fleet in the Northeast Atlantic. Seasonal and spatial distribution

Assembly rules for aggregate-species production models: simulations in support of management strategy evaluation

A comparative review of the fisheries resource management systems in New Zealand and in the European Union

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