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


  • Fig. 1 Surplus production from a simulated cod-like stock with surplus production model fits.

    Lines are the fits of Pella-Tomlinson models to data gathered from the “fish down” and “rebuilding” periods. No environmental forcing is present in this simulation (compare to figure 1, C to E, of Free et al.). Figures like this for stocks with other exploitation patterns and life histories can be created at, where the model description and a link to the code can also be found.

  • Fig. 2 True changes in simulated MSY compared to estimated changes from Free et al.

    Data were simulated from an age-structured model with environmental forcing acting on recruitment (green). Estimated changes in MSY from Free et al.’s methods are overlaid in gray. The polygons represent the range of equilibrium production curves. The distance from the maximum of the top border of a polygon of a given color to the maximum of its bottom border represents the total change in MSY. Black dots represent the simulated data to which Free et al.’s methods were applied.

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