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Marine Biology

, Volume 160, Issue 9, pp 2531–2533 | Cite as

Worrisome trends in global stock status continue unabated: a response to a comment by R.M. Cook on “What catch data can tell us about the status of global fisheries”

  • Rainer FroeseEmail author
  • Dirk Zeller
  • Kristin Kleisner
  • Daniel Pauly
Comment and Reply

In a previous contribution to this journal (Froese et al. 2012), we refuted criticism of a simple method (Froese and Kesner-Reyes 2002) that derives information about the status of global stocks from global catch data. This method assumes that, for a given stock, the ratio of current catches to previous maximum catches (Cmax) is indicative of the likely current exploitation status of the stock. For example, the method considers a stock as “collapsed” if current catch is <10 % of the previous maximum catch.

The method also assumes that current catches in the range of 0.5–1.0 Cmax are indicative of fully exploited stocks, implying that the maximum sustainable yield (MSY) would also fall into that range. This assumption was supported by the observation (Froese et al. 2012) that the median MSY/Cmax ratio in 50 fully assessed stocks of the Northeast Atlantic was 0.62 (95 % confidence limits 0.56–0.70). Also, a plot of log(Cmax) over log(MSY) for these stocks showed a high correlation with...

Keywords

Random Data Maximum Sustainable Yield Stock Size Catch Data Stock Status 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Josephine R. Barile for help with the analysis of the latest FAO data. This is FIN contribution number 140.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rainer Froese
    • 1
    Email author
  • Dirk Zeller
    • 2
  • Kristin Kleisner
    • 2
  • Daniel Pauly
    • 2
  1. 1.GEOMARKielGermany
  2. 2.Fisheries CentreUniversity of British ColumbiaVancouverCanada

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