Download FAR 2017/25 - Paua (Haliotis iris) length at maturity in PAU 3 and PAU 5A

Length at maturity data are used as an input into the length-based Bayesian stock assessment model to help in the estimation of spawning stock biomass. To date, the proportion mature estimates within the model have been based on data collected from only a few sites around New Zealand and concerns have been raised about whether or not this limited pool of data accurately represents the variation in length at maturity throughout the paua fishery. The purpose of this project was to estimate the length at maturity at a number of sites within specific QMAs and estimate the level of variation in length at maturity both within and between QMAs. It is envisaged that the more extensive pool of data will help reduce uncertainty with the model and will help inform decisions on finer spatial scale assessments and management.