Journal ArticleDOI
Rebuilding Mediterranean fisheries: a new paradigm for ecological sustainability
Francesco Colloca,Massimiliano Cardinale,Francesc Maynou,Marianna Giannoulaki,Giuseppe Scarcella,Klavdija Jenko,José María Bellido,Fabio Fiorentino +7 more
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TLDR
In this article, the authors show that under the current fishing regime, stock productivity and fleet profitability are generally impaired by a combination of high fishing mortality and inadequate selectivity patterns, and that a simple reduction in the current mortality towards an MSY reference value, without any change in the fishing selectivity, will allow neither stock biomass nor fisheries yield and revenue to be maximized.Abstract:
In Mediterranean European countries, 85% of the assessed stocks are currently overfished compared to a maximum sustainable yield reference value (MSY) while populations of many commercial species are characterized by truncated size- and age-structures. Rebuilding the size- and age-structure of exploited populations is a management objective that combines single species targets such as MSY with specific goals of the ecosystem approach to fisheries management (EAF), preserving community size-structure and the ecological role of different species. Here, we show that under the current fishing regime, stock productivity and fleet profitability are generally impaired by a combination of high fishing mortality and inadequate selectivity patterns. For most of the stocks analysed, a simple reduction in the current fishing mortality (Fcur) towards an MSY reference value (FMSY), without any change in the fishing selectivity, will allow neither stock biomass nor fisheries yield and revenue to be maximized. On the contrary, management targets can be achieved only through a radical change in fisheries selectivity. Shifting the size of first capture towards the size at which fish cohorts achieve their maximum biomass, the so-called optimal length, would produce on average between two and three times higher economic yields and much higher biomass at sea for the exploited stocks. Moreover, it would contribute to restore marine ecosystem structure and resilience to enhance ecosystem services such as reservoirs of biodiversity and functioning food webs.read more
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Journal ArticleDOI
The Alarming Decline of Mediterranean Fish Stocks
TL;DR: A meta-analysis of 42 European Mediterranean stocks of nine species in 1990-2010 shows that exploitation rate has been steadily increasing, selectivity has been deteriorating, and stocks have been shrinking, showing that stocks would be more resilient to fishing and produce higher long-term yields if harvested a few years after maturation.
Journal ArticleDOI
Mediterranean fishery discards: review of the existing knowledge
TL;DR: Despite the progress in studying discards, needs are evident to expand monitoring schemes, apply analytical techniques, and establish objectives of the discards issue under the framework of ecosystem approach to fisheries.
Journal ArticleDOI
Status and rebuilding of European fisheries
Rainer Froese,Henning Winker,Henning Winker,Gianpaolo Coro,Nazlı Demirel,Athanassios C. Tsikliras,Donna Dimarchopoulou,Giuseppe Scarcella,Martin F. Quaas,Nele Matz-Lück +9 more
TL;DR: In this paper, the authors examined the current status, exploitation pattern, required time for rebuilding, future catch, and future profitability for 397 European stocks and found 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.
Journal ArticleDOI
Historical changes of the Mediterranean Sea ecosystem: modelling the role and impact of primary productivity and fisheries changes over time.
Chiara Piroddi,Marta Coll,Marta Coll,Camino Liquete,Diego Macías,Krista Greer,Joe Buszowski,Jeroen Steenbeek,Roberto Danovaro,Roberto Danovaro,Villy Christensen +10 more
TL;DR: Investigation of the whole Mediterranean Sea using a food web modelling approach indicates that both changes in PP and fishing pressure played an important role in driving species dynamics, and PP was the strongest driver upon the Mediterranean Sea ecosystem.
Journal ArticleDOI
Trophic level-based indicators to track fishing impacts across marine ecosystems
Lynne J. Shannon,Marta Coll,Alida Bundy,Didier Gascuel,Johanna J. Heymans,Kristin M. Kleisner,Christopher P. Lynam,Chiara Piroddi,Jorge Tam,Morgane Travers-Trolet,Yunne Shin +10 more
TL;DR: In this paper, an extensive evaluation of a variety of TL indicators across 9 well-studied marine ecosystems by making use of model- as well as survey- and catch-based TL indicators was conducted.
References
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Journal ArticleDOI
Impacts of biodiversity loss on ocean ecosystem services.
Boris Worm,Edward B. Barbier,Nicola Beaumont,J. Emmett Duffy,Carl Folke,Carl Folke,Benjamin S. Halpern,Jeremy B. C. Jackson,Jeremy B. C. Jackson,Heike K. Lotze,Fiorenza Micheli,Stephen R. Palumbi,Enric Sala,Kimberley A. Selkoe,John J. Stachowicz,Reg Watson +15 more
TL;DR: The authors analyzed local experiments, long-term regional time series, and global fisheries data to test how biodiversity loss affects marine ecosystem services across temporal and spatial scales, concluding that marine biodiversity loss is increasingly impairing the ocean's capacity to provide food, maintain water quality, and recover from perturbations.
Journal ArticleDOI
Mathematical Bioeconomics: The Optimal Management of Renewable Resources.
TL;DR: In this article, the authors present a model for renewable-resource harvesting based on the Schaefer model with a focus on the one-dimensional control problem and its application to policy problems.
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Mathematical bioeconomics: The optimal management of renewable resources
TL;DR: In this paper, the authors present a model for renewable-resource harvesting based on the Schaefer model with a focus on the one-dimensional control problem and its application to policy problems.
Journal ArticleDOI
Rebuilding Global Fisheries
Boris Worm,Ray Hilborn,Julia K. Baum,Trevor A. Branch,Jeremy S. Collie,Christopher Costello,Michael J. Fogarty,Elizabeth A. Fulton,Jeffrey A. Hutchings,Simon Jennings,Simon Jennings,Olaf P. Jensen,Heike K. Lotze,Pamela M. Mace,Tim R. McClanahan,Cóilín Minto,Stephen R. Palumbi,Ana M. Parma,Daniel Ricard,Andrew Rosenberg,Reg Watson,Dirk Zeller +21 more
TL;DR: Current trends in world fisheries are analyzed from a fisheries and conservation perspective, finding that 63% of assessed fish stocks worldwide still require rebuilding, and even lower exploitation rates are needed to reverse the collapse of vulnerable species.
Biodiversity of the Mediterranean Sea: estimates, patterns and threats
Marta Coll,Jacopo Aguzzi,Enric Ballesteros,Marta Estrada,Josep M. Gasol,João Gil,Daniel Martin,Daniel Oro,José Templado,Xavier Turon,Roger Villanueva,Eleni Voultsiadou +11 more
TL;DR: Overall spatial and temporal patterns of species diversity and major changes and threats were assessed, and temporal trends indicated that overexploitation and habitat loss have been the main human drivers of historical changes in biodiversity.
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