Besides being found around the southern tip of South America, southern blue whiting (Micromesistius australis) is found on the southern shelf of New Zealand. There is occasionally reference to two distinct subspecies – Micromesistius australis pallidus and Micromesistius australis australis.

Hanchet (1999) found significant differences in growth rates as well as in morphometric characteristics suggesting that the 4 stocks, which have distinct spawning grounds, should be assessed and managed separately: Auckland Islands (SBW 6A), Bounty Platform stock (SBW 6B), Campbell Island Rise (SBW 6I) and Pukaki Rise stock (SBW 6R). These 4 biological stocks are used by the Ministry for Primary Industries (MPI) for assessment and management purposes (Fisheries New Zealand 2021).