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- W2152474769 abstract "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. Resumen: Existen diferencias en la percepción del estatus de las pesquerías en el mundo que se pueden derivar en parte de la manera en que se utilizan los datos sobre tendencias en las capturas. Con base en las tendencias en las capturas, se ha sugerido que cerca de 70% de todas las reservas son sobreexplotadas debido a capturas no sostenibles y que 30% de todas las reservas se han colapsado a <10% de niveles sin pesca. Las tendencias en las capturas también sugieren que un mayor número de reservas serán sobreexplotadas y colapsarán. Evaluamos como afecta el uso de datos de captura a la evaluación del estatus de las reservas pesqueras. Analizamos datos simulados de capturas aleatorias sin tendencias. Examinamos reservas bien estudiadas y clasificadas como colapsadas con base en datos de captura para determinar si esas reservas estaban realmente colapsadas. También utilizamos evaluaciones de reservas para comparar el estatus de las reservas derivadas de datos de captura con el estatus derivados de datos de biomasa. El estatus de las reservas derivado de las tendencias de captura fue casi idéntico al esperado si las capturas fueran generadas aleatoriamente sin tendencias. La mayoría de las clasificaciones de colapso asignadas con base en los datos de captura se debieron a reclasificaciones taxonómicas, cambios en las regulaciones de pesquerías y cambios en el mercado. En nuestra comparación de datos de biomasa con las tendencias en la captura, las tendencias en la captura sobreestimaron el porcentaje de reservas sobreexplotadas y colapsadas. Aunque nuestros datos de biomasa se obtuvieron principalmente de pesquerías industriales en países desarrollados, el estatus de esas reservas estimado a partir de datos de captura fue similar al estatus de reservas en el resto del mundo. Concluimos que actualmente 28–33% de todas las reservas están sobreexplotadas y 7–13% de todas las reservas están colapsadas. Adicionalmente, la proporción de reservas pesqueras que están sobreexplotadas o colapsadas ha sido medianamente estable en años recientes. A list of the U.S. West Coast fishery stocks classified as collapsed by the catch-based method, a determination of whether these stocks were actually collapsed, and an example of how the catch-based method estimates stock status as worse in the most recent years are available online. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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- W2152474769 date "2011-04-28" @default.
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- W2152474769 title "Contrasting Global Trends in Marine Fishery Status Obtained from Catches and from Stock Assessments" @default.
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- W2152474769 doi "https://doi.org/10.1111/j.1523-1739.2011.01687.x" @default.
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