This paper presents a revised plan for research fishing by the Koryo Maru 11 for the 2012/13 fishing season, and revises and replaces WG-SAM-12/21. The proposed research fishing is limited to Statistical Subarea 48.6. Preliminary assessments of Dissostichus spp. stocks in Subarea 48.6 north of 60°S (SSRUs 48.6A and 48.6G) and south of 60°S (SSRUs 48.6B, 48.6C, 48.6D and 48.6E) were conducted by OLRAC-SPS (2012) – tabled at WG-FSA-12 as a separate paper. The research plan presented here draws on the results presented by OLRAC-SPS (2012) and addresses knowledge gaps highlighted by that analysis. The preliminary assessment indicates that the historic precautionary maximum catch limit of 200 tonnes of Dissostichus spp. for Subarea 48.6 north of 60°S is sustainable and precautionary, and suggests that the historic precautionary maximum catch limit of 200 tonnes of Dissostichus spp. for Subarea 48.6 south of 60°S may be sustainable. Therefore the historic maximum catch limits are assumed for this research plan.