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
Citations
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References
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Journal ArticleDOI
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Serge M. Garcia,Richard Grainger +1 more
TL;DR: The future of marine capture fisheries will be conditioned by the political, social and economic evolution of the world within which they operate as discussed by the authors, and recent global scenarios for the future world are reviewed, with the emphasis on fisheries.
Journal ArticleDOI
Good news, bad news: global fisheries discards are declining, but so are total catches
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Journal ArticleDOI
Reinterpreting the State of Fisheries and their Management
TL;DR: In this article, the authors present three interpretations about the status of fisheries management that are widely accepted and for each consider an alternative interpretation of the data, and propose that, rather than abandoning current approaches to fisheries management, we should expand the use of the management tools used in fisheries that currently achieve biological and economic sustainability.
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