Download FAR 2021/39 Age data of orange roughy (Hoplostethus atlanticus) from the northwest Challenger region in 1993, 2013, and 2018

This report reviews how year class strength parameters are described and estimated in age-based stock assessments within New Zealand and overseas. The report discusses a range of assumptions commonly made with respect to year class strength parameters, including whether it is dealt with in log-space versus natural space, the choice of prior, and whether to include a penalty and/or constraining parameters to have some mean value. Recommendations for further exploration are made.