Main fisheries are conducted in New Zealand, Australia, NE Atlantic and Namibia, where different regional units are considered for assessment and management purposes. Several studies (e.g. Oke et al. 1997; Varela et al. 2012) have been conducted using distinct techniques (microsatellites, allozyme or mtDNA analysis, diet and behavior, etc.) in different geographic scales (New Zealand, Australia, Namibia, and Chile, North Atlantic). Genetic studies found differences among New Zealand and Australian stocks (Branch 2001) but the worldwide stock structure of orange roughy is still currently unknown and a lack of significant differentiation among far geographic samples is revealed (Varela et al. 2012). In New Zealand, the presumable biological stock structure is based on the spawning grounds identified but the 9 assessment/management units here considered according to main fisheries operating in the region, not always correspond to the boundaries of the biological stocks (more details in MPI, 2014a). Within the management unit Chatham Rise and Puysegur (ORH 3B) there are at least two biological stocks with correspondent assessment units: NW Chatham Rise, East and South Rise, Puysegur and the remainder of the sub-Antarctic area.