This report describes the results of the random-site potting survey for blue cod (Parapercis colias)off south Otago in April–May 2018. Estimates are provided for population abundance, size and age structure, sex ratio, total mortality (Z), and spawner biomass-per-recruit ratio. The 2018 potting survey was the third in the south Otago time series, with previous surveys in 2010 and 2013. The 2010 survey was a dual random-site and fixed-site experimental survey in three of the six strata, and 2013 was a solely random-site survey in all six strata.
