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Unformatted text preview: YR YR YIELD-PER-RECRUIT (continued) We will now do a bit more exploring of the yield-per-recruit surface. We will start with the yield-per-recruit analysis for North Sea plaice, based on Beverton and Holt's original development and application of the approach. See Bevertion and Holt (1957, Section 19) in the Recommended Readling list for additional details. 3-D View of the Yield-per-Recruit Surface for North Sea Plaice The Y/R (in kg/fish) is on the vertical axis; F (from 0 to 1.5 yr-1 ) is on the horizontal axis; and t e (from 3.5 to 15 yr) is on the axis that runs into the page. Here is the corresponding yield-per-recruit isopleth with shading to make it easier to visualize the different levels of Y/R. FW431/531 Copyright 2008 by David B. Sampson YieldPerRec2 - Page 60 Let us take a closer look at the shape of the Y/R surface. Fix t e and take a slice down through the surface in a direction parallel to the F axis....
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- Fall '09
- David B. Sampson, eumetric fishing curve