Optimising harvest strategies over multiple objectives and stakeholder preferences

Dowling, Natalie; Dichmont, Catherine M.; Leigh, George M.; Pascoe, Sean; Pears, Rachel; Roberts, Tom; Breen, Sian; Cannard, Toni; Mamula, Aaron; Mangel, Marc

doi:10.1016/j.ecolmodel.2020.109243

Cited by 9 publications

(11 citation statements)

References 47 publications

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“…where the management outcome is adjusted until a cross-sector overall optimum is achieved (Dowling et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Research and data collection for RF are also considerably lagging behind those for the commercial sector (Freire et al, 2016), presenting challenges for the develop- 3), although objectives regarding value for recreational and charter fishers were often included in numerous regions. The focus on ecological objectives for the RF sector likely mirrors a broader issue regarding limited implementation of the TBL in fishery HSs (Dowling et al, 2020), because articulating operational social objectives is challenging, as is relating economic objectives to the level of harvest.…”

Section: Ta B L Ementioning

confidence: 99%

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Toward sustainable harvest strategies for marine fisheries that include recreational fishing

et al. 2023

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Recreational fishing (RF) is a large yet undervalued component of fisheries globally. While progress has been made in monitoring, assessing, and managing the sector in isolation, integration of RF into the management of multi‐sector fisheries has been limited, particularly relative to the commercial sector. This marginalises recreational fishers and reduces the likelihood of achieving the sector's objectives and, more broadly, achieving fisheries sustainability. We examined the nature and extent of RF inclusion in harvest strategies (HSs) for marine fisheries across 15 regions in 11 nations to define the gap in inclusion that has developed between sectors. We focused on high‐income nations with a high level of RF governance and used a questionnaire to elicit expert knowledge on HSs due to the paucity of published documents. In total, 339 HSs were considered. We found that RF inclusion in HSs was more similar to the small‐scale sector (i.e., artisanal, cultural, or subsistence) than the commercial sector, with explicit operational objectives, data collection, performance indicators, reference points, and management controls lacking in many regions. Where specified, RF objectives focused on sustainability, economic value and catch allocation rather than directly relating to the recreational fishing experience. Conflicts with other sectors included competition with the commercial sector for limited resources, highlighting the importance of equitable resource allocation policies alongside HSs. We propose that RF be explicitly incorporated into HSs to ensure fisheries are ecologically, economically, and socially sustainable, and we recommend that fisheries organisations urgently review HSs for marine fisheries with a recreational component to close the harvest strategy gap among sectors.

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“…where the management outcome is adjusted until a cross-sector overall optimum is achieved (Dowling et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Section: Ta B L Ementioning

confidence: 99%

Toward sustainable harvest strategies for marine fisheries that include recreational fishing

et al. 2023

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“…Multi‐objective optimization can provide a useful framework that allows managers to embrace the trade‐off between profitability and stability rather than focus on a single aim (Mendoza and Martins 2006, Sanchirico et al 2008, Halpern et al 2013). Managers together with stakeholders could track quantitative metrics for multiple objectives (e.g., revenue stability, average revenue per vessel per year, and inequality of the fleet), explicitly weigh how important each of those objectives is (possibly uniquely across user groups), and ultimately select a strategy that balances desired outcomes across the different objectives and groups (Dowling et al 2020).…”

Section: Discussionmentioning

confidence: 99%

The effects of population synchrony, life history, and access constraints on benefits from fishing portfolios

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Holland

Punt

2021

Ecological Applications

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Natural resources often exhibit large interannual fluctuations in productivity driven by shifting environmental conditions, and this translates to high variability in the revenue resource users can earn. However, users can dampen this variability by harvesting a portfolio of resources. In the context of fisheries, this means targeting multiple populations, though the ability to actually build diverse fishing portfolios is often constrained by the costs and availability of fishing permits. These constraints are generally intended to prevent overcapitalization of the fleet and ensure populations are fished sustainably. As linked human-natural systems, both ecological and fishing dynamics influence the specific advantages and disadvantages of increasing the diversity of fishing portfolios. Specifically, a portfolio of synchronous populations with similar responses to environmental drivers should reduce revenue variability less than a portfolio of asynchronous populations with opposite responses. We built a bioeconomic model characterized by the Dungeness crab (Metacarcinus magister), Chinook salmon (Oncorhynchus tshawytscha), and groundfish fisheries in the California Current, and used it to explore the influence of population synchrony and permit access on revenue patterns. As expected, synchronous populations reduced revenue variability less than asynchronous populations, but only for portfolios including crab and salmon. Synchrony with longer-lived groundfish populations was not important because environmentally-driven changes in groundfish early life survival were mediated by growth and natural mortality over the full population age structure, and overall biomass was relatively stable across years. Thus, building a portfolio of diverse life histories can buffer against the impacts of extremely poor environmental conditions over short time scales, though not for long-term declines. Increasing access to all permits generally led to increased revenue stability and decreased inequality of the fleet, but also resulted in less revenue earned by an individual from a given portfolio because more vessels shared the available biomass. This means managers are faced with a tradeoff between the average revenue individuals earn and the risk those individuals accept. These results illustrate the importance of considering connections between social and ecological dynamics when evaluating management options that constrain or facilitate fishers' ability to diversify their fishing.

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“…By including temperature in their forecasts for Pacific cod and arrow tooth flounder of the Bering Sea, Holsman et al (2015) estimated that recommended yields were higher in models that included temperature compared to the same models without temperature effects. Secondly, quantitative forecasting provides evidence for initial discussions between stakeholders (e.g., Dowling et al 2020), which helps to prioritize the remainder of the CAP development process. Discussing the results of the biological forecast at this stage offers a valuable opportunity for stakeholders to express their concerns based on their own observations and experiences, some of which scientists and/or other experts might have overlooked.…”

Section: Task 1 (T1): Assessment Of Risks and Opportunitiesmentioning

confidence: 99%

Guidelines for co-creating climate adaptation plans for fisheries and aquaculture

et al. 2021

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Climate change is having a significant impact on the biology and ecology of fish stocks and aquaculture species and will affect the productivity within seafood supply chains in the future. The challenges are further amplified when actors within the fisheries and aquaculture sectors have very different ideas and assumptions about climate change and what risks and opportunities they entail. In order to address the challenges of climate change, several countries have developed national adaptation plans. However, fisheries and aquaculture are rarely included in these plans, resulting in a general lack of documented adaptation strategies within these sectors in most countries. This paper introduces guidelines for the development of climate adaptation plans (CAPs) within fisheries and aquaculture, applying a co-creation approach that requires the participation of scientists, industry representatives, policymakers, and other relevant stakeholders. The objective is to provide a stepwise approach to facilitate and enable stakeholders to plan strategies toward climate adaptation. The guidelines are based on practical experience and include a three-step process: (1) assessment of risks and opportunities; (2) identification of adaptation measures, and (3) operationalization of CAPs. The three-step process is also part of a larger cycle, including implementation, monitoring, and evaluation, again generating iterative feedback loops over time. Lessons learned are discussed, and we highlight the advantages and challenges of developing CAPs. While the guidelines are designed for and tested within fisheries and aquaculture systems, the CAP approach is also employable for other natural resource-based systems.

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Optimising harvest strategies over multiple objectives and stakeholder preferences

Cited by 9 publications

References 47 publications

Toward sustainable harvest strategies for marine fisheries that include recreational fishing

Toward sustainable harvest strategies for marine fisheries that include recreational fishing

The effects of population synchrony, life history, and access constraints on benefits from fishing portfolios

Guidelines for co-creating climate adaptation plans for fisheries and aquaculture

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