Intertemporal quota arbitrage in multispecies fisheries

Abstract Balanced harvest (BH) proposes to distribute a moderate mortality from fishing across the widest possible range of species, stocks, and sizes in an ecosystem, in proportion to their natural productivity so that the relative size and species composition are maintained, in line with the CBD requirement for sustainable use. This proposal has many and not always intuitive implications for fisheries management, e.g. in relation to selectivity, protection of juveniles and spawning sites, models of harvesting strategies, a focus on size and species, the impacts of discarding, aspects of emblematic species and ecosystem services, operational complexity, partial implementation, ecosystem rebuilding, and relations with broader management frameworks. The paper closes with a discussion of BH implementation, concluding that a logical step would be to integrate several separate initiatives to move fisheries into a more ecosystem-conscious context. Implementation challenges will be encountered, but there are lessons to be drawn from fishery ecosystems already close to BH, as in some tropical multispecies fisheries, and further, the implementation challenges are already being taken on in many well-managed fisheries and areas as management begins to address the realities of what ecosystem-based fishery management actually entails.

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Inclusion of ecological, economic, social, and institutional considerations when setting targets and limits for multispecies fisheries

ICES Journal of Marine Science ◽

10.1093/icesjms/fsw226 ◽

2017 ◽

Vol 74 (2) ◽

pp. 453-463 ◽

Cited By ~ 19

Author(s):

Anna Rindorf ◽

Catherine M. Dichmont ◽

James Thorson ◽

Anthony Charles ◽

Lotte Worsøe Clausen ◽

...

Keyword(s):

Fisheries Management ◽

Multiple Objectives ◽

Fisheries Governance ◽

Ecological Economic ◽

Multispecies Fisheries ◽

Institutional Aspects ◽

New Research ◽

Ecosystem Based Fisheries Management ◽

Term Management

Targets and limits for long-term management are used in fisheries advice to operationalize the way management reflects societal priorities on ecological, economic, social and institutional aspects. This study reflects on the available published literature as well as new research presented at the international ICES/Myfish symposium on targets and limits for long term fisheries management. We examine the inclusion of ecological, economic, social and institutional objectives in fisheries management, with the aim of progressing towards including all four objectives when setting management targets or limits, or both, for multispecies fisheries. The topics covered include ecological, economic, social and governance objectives in fisheries management, consistent approaches to management, uncertainty and variability, and fisheries governance. We end by identifying ten ways to more effectively include multiple objectives in setting targets and limits in ecosystem based fisheries management.

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Application of a threshold policy in the management of multispecies fisheries and predator culling

Mathematical Medicine and Biology A Journal of the IMA ◽

10.1093/imammb/dql005 ◽

2006 ◽

Vol 23 (1) ◽

pp. 63-75 ◽

Cited By ~ 19

Author(s):

Michel Iskin da Silveira Costa ◽

Magno Enrique Mendoza Meza

Keyword(s):

Threshold Policy ◽

Multispecies Fisheries

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Economic effort management in multispecies fisheries: the FcubEcon model

ICES Journal of Marine Science ◽

10.1093/icesjms/fsq076 ◽

2010 ◽

Vol 67 (8) ◽

pp. 1802-1810 ◽

Cited By ~ 23

Author(s):

Ayoe Hoff ◽

Hans Frost ◽

Clara Ulrich ◽

Dimitrios Damalas ◽

Christos D. Maravelias ◽

...

Keyword(s):

Single Species ◽

Fish Stock ◽

Economic Optimization ◽

Management Tools ◽

Management Framework ◽

Fish Stocks ◽

Effort Allocation ◽

Multispecies Fisheries ◽

The Past ◽

Quota Management

Abstract Hoff, A., Frost, H., Ulrich, C., Damalas, D., Maravelias, C. D., Goti, L., and Santurtún, M. 2010. Economic effort management in multispecies fisheries: the FcubEcon model. – ICES Journal of Marine Science, 67: 1802–1810. Applying single-species assessment and quotas in multispecies fisheries can lead to overfishing or quota underutilization, because advice can be conflicting when different stocks are caught within the same fishery. During the past decade, increased focus on this issue has resulted in the development of management tools based on fleets, fisheries, and areas, rather than on unit fish stocks. A natural consequence of this has been to consider effort rather than quota management, a final effort decision being based on fleet-harvest potential and fish-stock-preservation considerations. Effort allocation between fleets should not be based on biological considerations alone, but also on the economic behaviour of fishers, because fisheries management has a significant impact on human behaviour as well as on ecosystem development. The FcubEcon management framework for effort allocation between fleets and fisheries is presented, based on the economic optimization of a fishery's earnings while complying with stock-preservation criteria. Through case studies of two European fisheries, it is shown how fishery earnings can be increased significantly by reallocating effort between fisheries in an economically optimal manner, in both effort-management and single-quota management settings.

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Demersal Assemblages on the Soft Bottoms off the Catalan-Levante Coast of the Spanish Mediterranean

Journal of Marine Biology ◽

10.1155/2011/976396 ◽

2011 ◽

Vol 2011 ◽

pp. 1-16 ◽

Cited By ~ 3

Author(s):

Mariano García-Rodríguez ◽

Pere Abelló ◽

Angel Fernández ◽

Antonio Esteban

Keyword(s):

Fisheries Management ◽

Depth Distribution ◽

Ecosystem Approach ◽

Western Mediterranean ◽

Multispecies Fisheries ◽

Middle Slope ◽

Soft Bottoms ◽

High Species Richness ◽

Total Species ◽

Upper Slope

The analysis of 255 bottom trawl samples obtained in annual experimental surveys (2007–2010) along the western Mediterranean shows the existence of five well-defined demersal assemblages that follow a depth distribution: (a) upper shelf assemblages, including two assemblages differentiated by the type of substrate (sand-muddy and terrigenous muddy bottoms); (b) a middle shelf assemblage; (c) an upper slope assemblage; (d) a middle slope assemblage. Faunally, they are dominated by fish (37% of 452 total species), followed by crustaceans (22%), molluscs (17%), echinoderms (9%), and other invertebrates (15%). The assemblages identified showed major alterations on the shelf and shelf edge and less pronounced ones on the upper and middle slope. The average diversity values were more or less high, evidencing the high species richness in the western Mediterranean. The identified assemblages may facilitate future multispecies fisheries management based on an ecosystem approach.

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Modeling the Dynamics of Multispecies Fisheries: A Case Study in the Coastal Water of North Yellow Sea, China

Frontiers in Marine Science ◽

10.3389/fmars.2020.524463 ◽

2020 ◽

Vol 7 ◽

Author(s):

Jia Wo ◽

Chongliang Zhang ◽

Xindong Pan ◽

Binduo Xu ◽

Ying Xue ◽

...

Keyword(s):

Model Validation ◽

Fisheries Management ◽

Yellow Sea ◽

Sensitivity Analyses ◽

Size Spectrum ◽

Quality Of Data ◽

Estimation Model ◽

North Yellow Sea ◽

Multispecies Fisheries ◽

Spectrum Model

Ecosystem models have been developed for detecting community responses to fishing pressure and have been widely applied to predict the ecological effects of fisheries management. Key challenges of ecosystem modeling lie in the insufficient quantity and quality of data, which is unfortunately common in the marine ecosystems of many developing countries. In this study, we aim to model the dynamics of multispecies fisheries under data-limited circumstances, using a multispecies size-spectrum model (MSSM) implemented in the coastal ecosystem of North Yellow Sea, China. To make most of available data, we incorporated a range of data-limited methods for estimating the life-history parameters and conducted model validation according to empirical data. Additionally, sensitivity analyses were conducted to evaluate the impacts of input parameters on model predictions regarding the uncertainty of data and estimating methods. Our results showed that MSSM could provide reasonable predictions of community size spectra and appropriately reflect the community composition in the studied area, whereas the predictions of fisheries yields were biased for certain species. Errors in recruitment parameters were most influential on the prediction of species abundance, and errors in fishing efforts substantially affected community-level indicators. This study built a framework to integrate parameter estimation, model validation, and sensitivity analyses altogether, which could guide model development in similar mixed and data-limited fisheries and promote the use of size-spectrum model for ecosystem-based fisheries management.

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