Evaluating methods for setting catch limits in data-limited fisheries

Carruthers, Tom; Punt, André E.; Walters, Carl J.; MacCall, Alec D.; McAllister, Murdoch K.; Dick, Edward J.; Cope, Jason M.

doi:10.1016/j.fishres.2013.12.014

Cited by 231 publications

(212 citation statements)

References 23 publications

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“…Looking at the 12 ecoregions supporting the 397 stocks analyzed in this study (Table 1), including nine large marine ecosystems also analyzed in Worm et al [59], no region had an average exploitation rate at or below the rate predicted to achieve maximum sustainable yields (Table 1). Similarly, Rosenberg et al [64] apply a combination of four data-limited methods with strong known biases [24,65] and no corrections for reduced recruitment to global catch data and conclude that, e.g., half of the stocks in the Northeast Atlantic and the Mediterranean and Black Sea have a biomass near or above B msy in 2013, whereas our more detailed study shows that this applies to only 28% and 5% of these stocks, respectively.…”

Section: Suitability Of Surplus Production Models For Stock Assessmentmentioning

confidence: 54%

Status and rebuilding of European fisheries

et al. 2018

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the reformed Common Fisheries Policy (CFP) of the European Union is legally binding for all Member States. It prescribes the end of overfishing and the rebuilding of all stocks above levels that can produce maximum sustainable yields (MSY). This study examines the current status, exploitation pattern, required time for rebuilding, future catch, and future profitability for 397 European stocks. Fishing pressure and biomass were estimated from 2000 to the last year with available data in 10 European ecoregions and 2 wide ranging regions. In the last year with available data, 69% of the 397 stocks were subject to ongoing overfishing and 51% of the stocks were outside of safe biological limits. Only 12% of the stocks fulfilled the prescriptions of the CFP. Fishing pressure has decreased since 2000 in some ecoregions but not in others. Barents Sea and Norwegian Sea have the highest percentage (> 60%) of sustainably exploited stocks that are capable of producing MSY. In contrast, in the Mediterranean Sea, fewer than 20% of the stocks are exploited sustainably. Overfishing is still widespread in European waters and current management, which aims at maximum sustainable exploitation, is unable to rebuild the depleted stocks and results in poor profitability. This study examines four future exploitation scenarios that are compatible with the CFP. It finds that exploitation levels of 50-80% of the maximum will rebuild stocks and lead to higher catches than currently obtained, with substantially higher profits for the fishers.

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Section: Suitability Of Surplus Production Models For Stock Assessmentmentioning

confidence: 54%

Status and rebuilding of European fisheries

et al. 2018

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“…Emerging data-poor methods used to analyze fish stocks have included catch data, similar to that collected by researchers in Bejuco, to determine sustainable yields for data-poor fishery resources (Cope & Punt, 2009;MacCall, 2009;Dick & MacCall, 2011). The performance of these target reference points could then be gauged by a management strategy evaluation (Carruthers et al, 2014). While these techniques should be used to further analyze the Bejuco bottom-longline fishery's data, they should be implemented in conjunction with strategies that continue monitoring snapper catch and environmental data for future analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Because fishery managers in developing countries have limited access to sufficient time series of data for stock assessments (Costello et al, 2012;Carruthers et al, 2014), alternative approaches that identify potential changes in the fishery and ecosystem are often more appropriate than sophisticated mathematical analysis (Caddy, 2002). These approaches, however, must also take into account not just resource and data availability, but also that complex societal structures make the governance of the ecosystems -within which these resources exist -inherently difficult (Bodin & Crona, 2009).…”

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confidence: 99%

Indicator-based management recommendations for an artisanal bottom-longline fishery in Costa Rica, Central America

Bystrom

Naranjo-Madrigal²,

Wehrtmann

2017

RBT

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There is a growing need to strengthen the small-scale fishing sector with emerging governance methods that improve fishers’ threatened livelihoods. Therefore, this study’s aim was to develop management recommendations, based on easily interpreted conclusions that can be used to address the socio-ecological difficulties that the artisanal, bottom-longline fishery in Bejuco, Pacific coast of Costa Rica faces. The results of previously recorded fisher socio-ecological perceptions and an evaluation of the spotted rose snapper’s, Lutjanus guttatus, population dynamics were assigned a measurable set of indicators in reference to the fishery’s natural, human and management sub-systems. This was done via the traffic light method with easily interpreted colors based on a review of similar published fisheries studies. According to these results, a stock assessment for the fishery’s target species and research to determine the composition and magnitude of the fishery’s discarded species were recommended. Fisher economic dependence on bottom-longline activities led to the recommendation to develop alternative livelihood strategies. Also, the promotion of alternative markets and sustainability certification strategies for the snapper fishery are advised. Enlargement of the multi-use marine protected areas within the fishery’s grounds and improvement of their management strategies is also recommended. In order for this to occur, improved resource user coordination in the form of a fisher association that has the capability to lobby for increased enforcement of the protected areas from destructive fisheries must be realized. Doing so would aid the development of a local management plan and participatory governance system. Such an initiative would justify the development of community lead marine protected area management regimes.

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“…Thus administrators need to weigh the benefits and negative impacts of ITQs when implementing these and that they should not be seen as the panacea for solving all fisheries management problems (Gibbs, 2009;Pinkerton and Edwards, 2009;Clark et al, 2010;Essington, 2010), particularly in small-scale fisheries in developing countries (Davis and Ruddle, 2012;Béné et al, 2010). Despite the doubts and problems about the applicability of ITQs for managing multi-species and data poor http://repository.uwc.ac.za fisheries that are typical of small-scale fisheries in developing countries (Pauly, 1996;Sumaila, 2010), new methods of setting catch limits for data-poor fisheries (Carruthers et al, 2014;Newman et al, 2015) provide hope that such problems could be overcome.…”

Section: Rights Based Managementmentioning

confidence: 99%

Between a rock and a hard place: The need for and challenges to implementation of Rights Based Fisheries Management in small-scale fisheries of southern Lake Malawi

Hara

Njaya²

2016

Fisheries Research

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There has been a decline in commercially valuable fish species, especially the Chambo (Oreochromis spp), in southern Lake Malawi. Although there might be lack of reliable and scientifically backed evidence, most experts and experienced fishers concur that productivity of most fish stocks in the area is much below par compared to their productivity about two to three decades ago. This leads to the hypotheses that the fish stocks are generally over-exploited. This trend will continue or their productivity will remain at these depressed levels unless appropriate measures are taken. This article argues that Rights Based Management (RBM) could hold the best hope for moving towards sustainable fisheries management in the southern Lake Malawi (Southeast and Southwest Arms) area while recognizing the need for a broad human rights approach for fishing communities. Even then, the implementation of the RBM approach will not be easy given the historical developmental open access management approach and general unorganized characteristics of the small-scale fisheries sector. Of note is that comanagement was introduced in area in the early millennium as part of attempts to strengthen user fishing rights, local accountability and stewardship -with mixed results.

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Evaluating methods for setting catch limits in data-limited fisheries

Cited by 231 publications

References 23 publications

Status and rebuilding of European fisheries

Status and rebuilding of European fisheries

Indicator-based management recommendations for an artisanal bottom-longline fishery in Costa Rica, Central America

Between a rock and a hard place: The need for and challenges to implementation of Rights Based Fisheries Management in small-scale fisheries of southern Lake Malawi

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