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D.J. Agnew  - - - 
Top co-authors
C. Zimmermann

66 shared publications

Eriko Hoshino

5 shared publications

C.T.T. Edwards

4 shared publications

J.F. Caddy

2 shared publications

D.J. Agnew

5
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29
Citations
Publication Record
Distribution of Articles published per year 
(1985 - 2013)
Total number of journals
published in
 
4
 
Publications
Article 1 Read 3 Citations Rebuttal to Froese and Proelss “Evaluation and legal assessment of certified seafood” D.J. Agnew, N.L. Gutiérrez, A. Stern-Pirlot, A.D.M. Smith, K... Published: 01 March 2013
Marine Policy, doi: 10.1016/j.marpol.2012.07.002
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In a recent paper, Froese and Proelss [1] contend that 31% of stocks targeted by Marine Stewardship Council (MSC) certified fisheries are overfished and subject to ongoing overfishing and a further 8% are either overfished or subject to overfishing. Their results are derived using a definition of ‘overfished’ that is not consistent with internationally accepted definitions and interpretations. In addition, the authors used unrealistic estimates of biomass that produce Maximum Sustainable Yields (BMSY) obtained through methods that are inconsistent with the approach used by the management agencies and scientific advisory bodies responsible for the stocks in question.Analyses such as that published by Froese and Proelss are an important part of the external, independent scrutiny of the programme that MSC welcomes. However there are a number of serious flaws in their analysis, data and resulting conclusions that this response seeks to correct. Using data for 45 stocks exploited by MSC certified fisheries (>60% of total fisheries in the programme and >80% of total certified catch), internationally accepted methods for determining MSY reference points, and internationally accepted definitions of the terms ‘overfished’ and ‘overfishing’, no stocks exploited by MSC certified fisheries can be defined as overfished (below their limit reference points). Highlights► Results of the recent Froese and Proelss study on MSC certified seafood were re-analysed. ► The Froese and Proelss study was found to contain incorrect definitions of “overfished”. ► 45 MSC stocks were re-analysed using internationally accepted definitions and methods. ► No MSC stocks were found to be “overfished”.
Article 1 Read 2 Citations Bioeconomic evaluation of fisheries enforcement effort using a multifleet simulation model C.T.T. Edwards, R. Hillary, Eriko Hoshino, J. Pearce, D.J. A... Published: 01 January 2011
Fisheries Research, doi: 10.1016/j.fishres.2010.11.007
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The economics of enforcement is traditionally modelled using rational agents assumed to act according to their expected economic utility. In this investigation we derive this expectation by implementing a stochastic simulation model to integrate across associated levels of uncertainty using Monte Carlo. The model is developed for the South Georgia toothfish longline fishery, in which legal catches are strictly managed according to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) conservation measures. Assuming full compliance in the legal fishery, this investigation deals with the role of a fishing patrol vessel (FPV) in excluding illegal fishing vessels. Both legal and illegal fleets are dynamic. For the legal fleet, catch is set by a harvest control rule within the model framework, with vessels leaving if fishing becomes unprofitable. The illegal catch is determined by the number of vessels operating, which predicts catch on the basis of an estimated production function. The exit of illegal vessels is determined by the probability of detection by the FPV, which is a function of days spent on patrol, and estimated profits. The entry of illegal vessels occurs at a fixed mean rate, with the model integrating over uncertainty in this parameter. An obvious trade off exists in that higher levels of illegal activity lead to lower expected returns to the legal fleet. We thus provide a cost-benefit framework for investigating the trade-offs associated with decisions on enforcement in the fishery, and confirm that current enforcement effort levels are well justified.
Article 1 Read 20 Citations An overview of recent global experience with recovery plans for depleted marine resources and suggested guidelines for r... J.F. Caddy, D.J. Agnew Published: 01 March 2004
Reviews in Fish Biology and Fisheries, doi: 10.1007/s11160-004-3770-2
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Progress with stock recovery plans to date for depleted marine resources is reviewed, based on published and publicly available sources. Most plans began within the last two decades, so quantifying progress is difficult, but some 60 cases were found where a recovery effort had been explicitly tackled by either a closure or restrictive measures, and seven documented case studies were used to draw general conclusions on recovery procedures and to provide a list of considerations for best practice in recovery planning. More successes were documented for pelagic .sheries than demersals, especially with closures, while spontaneous recoveries of some depleted invertebrate resources seem related to reductions in predator pressure. Few shared, straddling or highly migratory stocks have been restored to date. Most successful recoveries occurred in the centre of the species geographical range and/or in favourable regimes. Success seems to depend on non-discretionary fishery control laws being applied. Depletions aggravated by unfavourable climatic regimes will be difficult to reverse, as illustrated by a simulation. Durations of recovery plans in particular depend on regime, and using stock information from favourable regimes to predict plan duration should be treated with caution. Although successful recoveries to date have tended to be decadal, a considerable proportion are still underway, and are likely to exceed this duration.
Article 1 Read 4 Citations The feeding ecology of two littoral amphipods (Crustacea), Echinogammarus pirloti (Sexton & Spooner) and E. obtusatus (D... D.J. Agnew, P.G. Moore Published: 01 December 1986
Journal of Experimental Marine Biology and Ecology, doi: 10.1016/0022-0981(86)90141-3
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Article 1 Read 3 Citations The effect of oxygen tension on the physiology and distribution of Echinogammarus pirloti (Sexton & Spooner) and E. obtu... D.J. Agnew, A.C. Taylor Published: 01 April 1985
Journal of Experimental Marine Biology and Ecology, doi: 10.1016/0022-0981(85)90089-9
DOI See at publisher website