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"Fisheries management"
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Effective fisheries management instrumental in improving fish stock status
Marine fish stocks are an important part of the world food system and are particularly important for many of the poorest people of the world. Most existing analyses suggest overfishing is increasing, and there is widespread concern that fish stocks are decreasing throughout most of the world. We assembled trends in abundance and harvest rate of stocks that are scientifically assessed, constituting half of the reported global marine fish catch. For these stocks, on average, abundance is increasing and is at proposed target levels. Compared with regions that are intensively managed, regions with less-developed fisheries management have, on average, 3-fold greater harvest rates and half the abundance as assessed stocks. Available evidence suggests that the regions without assessments of abundance have little fisheries management, and stocks are in poor shape. Increased application of area-appropriate fisheries science recommendations and management tools are still needed for sustaining fisheries in places where they are lacking.
Journal Article
Beyond the tragedy in global fisheries
The oceans are heavily overfished, and the greatest challenges to effective fisheries management are not technical but political and economic. In this book, D. G. Webster describes how the political economy of fisheries has evolved and highlights patterns that are linked to sustainable transitions in specific fisheries. Grounded in the concept of responsive governance, Webster's interdisciplinary analysis goes beyond the conventional view of the \"tragedy of the commons.\" Using her Action Cycle/Structural Context framework, she maps long-running patterns that cycle between depletion and rebuilding in a process that she terms the management treadmill. Webster documents the management treadmill in settings that range from small coastal fishing communities to international fisheries that span entire oceans. She identifies the profit disconnect, in which economic incentives are out of sync with sustainable use, and the power disconnect, in which those who experience the costs of overexploitation are politically marginalized. She examines how these disconnects shaped the economics of expansion and documents how political systems failed to prevent related cycles of serial resource depletion. Webster also traces the increasing use of restrictive management in response to worsening fisheries crises and the emergence of new, noncommercial interests that demand greater management but also generate substantial conflict. She finds that the management treadmill is speeding up with population growth and economic development, and so concludes that sustainable fisheries can only exist within a sustainable global economic system.
Book
Ecosystem‐Based Fisheries Management for Social–Ecological Systems: Renewing the Focus in the United States with Next Generation Fishery Ecosystem Plans
Resource managers and policy makers have long recognized the importance of considering fisheries in the context of ecosystems; yet, movement towards widespread Ecosystem‐based Fisheries Management (EBFM) has been slow. A conceptual reframing of fisheries management is occurring globally, which envisions fisheries as systems with interacting biophysical and human subsystems. This broader view, along with a process for decision making, can facilitate implementation of EBFM. A pathway to achieve these broadened objectives of EBFM in the United States is a Fishery Ecosystem Plan (FEP). The first generation of FEPs was conceived in the late 1990s as voluntary guidance documents that Regional Fishery Management Councils could adopt to develop and guide their ecosystem‐based fisheries management decisions, but few of these FEPs took concrete steps to implement EBFM. Here, we emphasize the need for a new generation of FEPs that provide practical mechanisms for putting EBFM into practice in the United States. We argue that next‐generation FEPs can balance environmental, economic, and social objectives—the triple bottom line—to improve long‐term planning for fishery systems.
Journal Article
Evolving science of marine reserves: New developments and emerging research frontiers
The field of marine reserve science has matured greatly over the last decade, moving beyond studies of single reserves and beyond perspectives from single disciplines. This Special Feature exemplifies recent advances in marine reserve research, showing insights gained from synthetic studies of reserve networks, long-term changes within reserves, integration of social and ecological science research, and balance between reserve design for conservation as well as fishery and other commercial objectives. This rich body of research helps to inform conservation planning for marine ecosystems but also poses new challenges for further study, including how to best design integrated fisheries management and conservation systems, how to effectively evaluate the performance of entire reserve networks, and how to examine the complex coupling between ecological and socioeconomic responses to reserve networks.
Journal Article
Status and Solutions for the World's Unassessed Fisheries
Recent reports suggest that many well-assessed fisheries in developed countries are moving toward sustainability. We examined whether the same conclusion holds for fisheries lacking formal assessment which comprise >80% of global catch. We developed a method using species' life-history, catch, and fishery development data to estimate the status of thousands of unassessed fisheries worldwide. We found that small unassessed fisheries are in substantially worse condition than assessed fisheries, but that large unassessed fisheries may be performing nearly as well as their assessed counterparts. Both small and large stocks, however, continue to decline; 64% of unassessed stocks could provide increased sustainable harvest if rebuilt. Our results suggest that global fishery recovery would simultaneously create increases in abundance (56%) and fishery yields (8 to 40%).
Journal Article
Marine resources, climate change and international management regimes
\"This book is available as open access through the Bloomsbury Open Access programme and is available on www.bloomsburycollections.com. When changes in the oceans impact fisheries, are states able to handle the management of these changes amongst themselves, or are they locked in patterns and mechanisms that prove inflexible and inefficient in dealing with rapid external environmental changes? This volume explores how international institutions and regimes set up to manage marine resources - predominantly fisheries - are adapting to the effects of climate change and the related consequences for the geographic distribution of these resources. In the Barents Sea, cod is expanding north-eastwards, while in the Norwegian Sea significant changes in abundance, distribution and migration patterns can be observed in pelagic species such as mackerel. In the Southern Ocean, the combined effect of increasing temperatures with associated declines in sea ice, ocean acidification and changes in circulation is likely to affect the geographical distribution of krill. These developments put established international management regimes under pressure. In this interdisciplinary research volume, world-leading marine biologists, international lawyers and political scientists join efforts to study the resilience of Arctic and Antarctic marine resource management institutions to large-scale shifts of major marine stocks\"-- Provided by publisher.
Book
Fish reproductive-energy output increases disproportionately with body size
Body size determines total reproductive-energy output. Most theories assume reproductive output is a fixed proportion of size, with respect to mass, but formal macroecological tests are lacking. Management based on that assumption risks underestimating the contribution of larger mothers to replenishment, hindering sustainable harvesting. We test this assumption in marine fishes with a phylogenetically controlled meta-analysis of the intraspecific mass scaling of reproductive-energy output. We show that larger mothers reproduce disproportionately more than smaller mothers in not only fecundity but also total reproductive energy. Our results reset much of the theory on how reproduction scales with size and suggest that larger mothers contribute disproportionately to population replenishment. Global change and overharvesting cause fish sizes to decline; our results provide quantitative estimates of how these declines affect fisheries and ecosystem-level productivity.
Journal Article