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fDesc[0] = "Length Based Yield per Recruit (YPRLEN) is an implementation of the basic Thompson-Bell model for estimating the expected lifetime yield and biomass from a cohort subjected to varying levels of fishing mortality. <br /> <br /> In the length-based model the user provides parameters of a von Bertalanffy growth equation. Age is taken as relative with the model starting at age zero. The user also provides parameters for equations relating weight, selectivity and maturity to length.<br /> <br /> The user provides a small age step as an integration factor. This is converted to length by the von Bertalanffy equation and the other required data is derived from length.<br /> <br /> This approach may in many cases provide a more accurate lifetime yield and biomass curve than the traditional age-based YPR model.";

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