Journal ArticleDOI
Contrasting Global Trends in Marine Fishery Status Obtained from Catches and from Stock Assessments
Reads0
Chats0
TLDR
How use of catch data affects assessment of fisheries stock status is evaluated and it is concluded that at present 28-33% of all stocks are overexploited and 7-13% ofall stocks are collapsed, which is fairly stable in recent years.Abstract:
There are differences in perception of the status of fisheries around the world that may partly stem from how data on trends in catches over time have been used. On the basis of catch trends, it has been suggested that about 70% of all stocks are overexploited due to unsustainable harvesting and 30% of all stocks have collapsed to <10% of unfished levels. Catch trends also suggest that over time an increasing number of stocks will be overexploited and collapsed. We evaluated how use of catch data affects assessment of fisheries stock status. We analyzed simulated random catch data with no trend. We examined well-studied stocks classified as collapsed on the basis of catch data to determine whether these stocks actually were collapsed. We also used stock assessments to compare stock status derived from catch data with status derived from biomass data. Status of stocks derived from catch trends was almost identical to what one would expect if catches were randomly generated with no trend. Most classifications of collapse assigned on the basis of catch data were due to taxonomic reclassification, regulatory changes in fisheries, and market changes. In our comparison of biomass data with catch trends, catch trends overestimated the percentage of overexploited and collapsed stocks. Although our biomass data were primarily from industrial fisheries in developed countries, the status of these stocks estimated from catch data was similar to the status of stocks in the rest of the world estimated from catch data. We conclude that at present 28-33% of all stocks are overexploited and 7-13% of all stocks are collapsed. Additionally, the proportion of fished stocks that are overexploited or collapsed has been fairly stable in recent years.read more
Citations
More filters
Journal ArticleDOI
Stock Assessment and Rebuilding of Two Major Shrimp Fisheries (Penaeus monodon and Metapenaeus monoceros) from the Industrial Fishing Zone of Bangladesh
Mohammed Shahidul Alam,Qun Liu,F. Schneider,Mohammad Mojibul Hoque Mozumder,Mohammad Muslem Uddin,Md. Mostafa Monwar,Md. Enamul. Hoque,Suman Barua +7 more
TL;DR: In this article , the depletion-based stock reduction analysis (DB-SRA) was employed to assess the stock biomass status of two economically important shrimp species in Bangladesh, namely, tiger shrimp, Penaeus monodon, and brown shrimp, Metapenaeus monoceros.
Journal ArticleDOI
Environment or catches? Assessment of the decline in blackspot seabream (Pagellus bogaraveo) abundance in the Strait of Gibraltar
Víctor Sanz-Fernández,Juan Carlos Gutiérrez-Estrada,Inmaculada Pulido-Calvo,Juan Gil-Herrera,S. Benchoucha,Sana el Arraf +5 more
TL;DR: In this article, the authors carried out an analysis of the relationship between the variation in environmental and oceanographic parameters and the changes in the abundance of blackspot sea bream in the Strait of Gibraltar between 1983 and 2016.
Journal ArticleDOI
Abandoned, lost, or discarded fishing gear at urban coastlines.
Anya Roopa Gajanur,Zeehan Jaafar +1 more
TL;DR: Abandoned, lost, or discarded fishing gear (ALDFG) is considered a major threat to ocean biodiversity as discussed by the authors , and little is known of the interactive impacts of ALDFGs and urban nearshore biodiversity and habitats, especially in Southeast Asia where fisheries efforts are increasing.
Journal ArticleDOI
Modeling recreational fishing intensity in a complex urbanised estuary.
TL;DR: Using point-data from 573 visual surveys with recently developed Poisson point process models, Sydney Harbour's recreational fishery is examined, demonstrating the utility of these models for understanding the distribution of boat and shore-based fishers, and the effects of a range of temporally static and dynamic predictors on these distributions.
Journal ArticleDOI
Estimation of catch losses resulting from overexploitation in the global marine fisheries
TL;DR: In this paper, the catch trends and approximate thresholds of sustainable fishing for fished stocks were analyzed to estimate the potential loss of catch and revenue of global fisheries as a result of overexploitation during the period of 1950-2010 in 14 FAO fishing areas.
References
More filters
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
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.
Journal ArticleDOI
Some aspects of the dynamics of populations important to the management of the commercial marine fisheries
TL;DR: In order to apply the theory developed here to the tropical tuna fishery, it will be necessary to compile statistics of catch, abundance and intensity of fishing over a considerable series of years, beginning as early in the history of the fishery as possible.
Book ChapterDOI
The National Oceanic and Atmospheric Administration
TL;DR: The National Oceanic and Atmospheric Administration (NOAA) directs the National Marine Sanctuary Program (NMSP), through its Office of Ocean and Coastal Resources Management (OCRM) as mentioned in this paper.
Journal ArticleDOI
Cascading effects of the loss of apex predatory sharks from a coastal ocean.
TL;DR: For example, this paper found that the abundance of all 11 great sharks that consume other elasmobranchs (rays, skates, and small sharks) fell over the past 35 years, while 12 of 14 of these prey species increased in coastal northwest Atlantic ecosystems.
Related Papers (5)
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