Yield per Recruit 3.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of the program is NOAA, National Marine Fisheries Service. The following versions: 3.1 and 2.7 are the most frequently downloaded ones by the program users. The software belongs to Education Tools.
From the developer:
Yield per Recruit (YPR) is a major revision of earlier implementations of the basic Thompson-Bell model for estimating the expected lifetime yield and biomass from a cohort subjected to varying levels of fishing mortality.
You may want to check out more software, such as Recruit Studio - 1, Zoho Recruit or Recruitment Viewer, which might be similar to Yield per Recruit.