Technical Comments

Comment on “Impacts of historical warming on marine fisheries production”

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Science  16 Aug 2019:
Vol. 365, Issue 6454, eaax5721
DOI: 10.1126/science.aax5721


Free et al. (Reports, 1 March 2019, p. 979) linked sea surface temperature (SST) to surplus production and estimated a 4% decline in maximum sustainable yield (MSY) since 1930. Changes in MSY are expected when fitting production models to age-structured data, so attributing observed changes to SST is problematic. Analyses of recruitment (a metric of productivity in the same database) showed increases in global productivity.

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