Season extension trials occur step-wise in the longline fishery for Dissostichus eleginoides in Statistical Division 58.5.2. This paper presents results of trial fishing season extensions for the periods between 15 and 30 April, and between 1 and 14 November, during 2013/14 and 2014/15. Based on the results, it proposes a new step-wise trial pre-season extension of the longline fishing season to include the period between 1 and 14 April with day/night setting allowed. It also proposes that conditions be established as the basis for a further step-wise trial post-season extension of the longline fishing season. Subject to these conditions being met, the post-season is proposed to be extended to include the period between 15 and 30 November with day/night setting allowed. Australia will continue to report to SC‑CAMLR each year concerning the progress and outcomes of each step-wise season extension trial.