Journal ArticleDOI
Contrasting Global Trends in Marine Fishery Status Obtained from Catches and from Stock Assessments
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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
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Book ChapterDOI
The Global Status of Fisheries: a long tale of scientists, opinions, and papers written and refuted, all in the pursuit of the same truth
Ray Hilborn,Ulrike Hilborn +1 more
TL;DR: The Global Status of Fisheries: A Long Tale of Scientists, Opinions, and Papers Written and Refuted, All in the Pursuit of the same Truth as discussed by the authors is a collection of articles about the status of fisheries from most developed countries and international agencies.
Posted ContentDOI
Sustainable reference points for multispecies coral reef fisheries
Jessica Zamborain-Mason,Joshua E. Cinner,M. Aaron MacNeil,Nicholas A. J. Graham,Andrew S. Hoey,Maria Beger,Andrew J. Brooks,David R. Booth,Graham J. Edgar,David A. Feary,Sebastian C. A. Ferse,Alan M. Friedlander,Charlie Gough,Alison Green,David Mouillot,Nicholas Polunin,Rick D. Stuart-Smith,Laurent Wantiez,Ivor D. Williams,Shaun K. Wilson,Sean R. Connolly +20 more
TL;DR: In this paper , the authors estimate site-specific sustainable reference points for coral reef fisheries and use these to assess the status of coral reef fish stocks, finding that more than half of jurisdictions with available information have stocks of conservation concern, having failed at least one fisheries sustainability benchmark.
DissertationDOI
A bayesian state-space approach to improve biomass projections for managing new england groundfish
TL;DR: In this paper , the authors developed a novel index-based method framework using dynamic linear models (DLMs), a flexible Bayesian state-space approach, and evaluated the predictive performance of candidate DLM structures via retrospective forecasting.
Journal ArticleDOI
Effects of Fishing Selectivity and Dynamics on the Performance of Catch-Based Data-Limited Assessment Models for Species with Different Life History Traits
TL;DR: In this article, the authors investigated the performance of catch-based models for species with different life history traits, fishing histories, and under different length selections, and found that the models tended to overestimate stock status when fishing mortality continued to increase.
References
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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
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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.
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