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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Journal ArticleDOI
Evaluating methods that classify fisheries stock status using only fisheries catch data
TL;DR: In this paper, the success rate and bias of stock status classification by two catch-based methods are compared with those of two stock assessment methods that explicitly model population dynamics and use additional fishing effort data.
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Catch trends in Philippine small-scale fisheries over the last five decades: The fishers׳ perspectives
Richard N. Muallil,Richard N. Muallil,Samuel S Mamauag,Jeffrey T. Cababaro,Hazel O Arceo,Porfirio M. Aliño +5 more
TL;DR: In this paper, the authors describe some changes in small-scale fisheries in the Philippines over the past five decades using both "quantitative" and "qualitative" estimates of current and past daily catches.
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Challenges for Implementing an Ecosystem Approach to Fisheries Management
James H. Cowan,Jake Rice,Carl J. Walters,Ray Hilborn,Timothy E. Essington,John W. Day,Kevin M. Boswell +6 more
TL;DR: The authors argue that one way to counter politicization of fisheries decision-making is to ensure that new ecosystem-based approaches in fisheries are viewed only as an emergent property of innovation in science and policy.
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The unintended consequences of simplifying the sea: making the case for complexity
TL;DR: It is concluded that the transition from multispecies fisheries to simplified invertebrate fisheries is causing a global decline in biodiversity and is threatening global food security, rather than promoting it.
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