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”
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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...
KeywordsRandom Data Maximum Sustainable Yield Stock Size Catch Data Stock Status
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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