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This is the first time scientists have undertaken satellite monitoring of sea lions based on the New Zealand mainland.
And this week, for the first time, the animals have also been fitted with time-depth recorders, which provide information on the duration and depth of their underwater forays.
Four of the nine female sea lions of breeding age which live on the peninsula, were temporarily fitted with the lightweight, miniaturised equipment, at the start of a Department of Conservation study expected to run for up to three years.
Otago Peninsula is the first place on the mainland where sea lions have begun to breed since seals and sea lions were wiped out on the mainland by hunting and commercial sealing, by the early 1800s.
Doc coastal ranger Jim Fyfe said the new research was ‘‘really exciting'', with better information likely to produce improved conservation planning.
All the tagged Otago sea lions are descendants of Mum, a sea lion matriarch whose first pup, Katya, became, in early 1994, also the first sea lion pup produced on the mainland since the early 1800s.
Fitted with monitoring gear this week were Katya (14), and Katya's daughter Aurora (4), as well as two of Mum's other daughters, Honey (5) and Leonie (12).
Anyone who sees a sea lion with tracking tags is asked to record the date, time and place, take a photo if possible, and provide the details - via email to email@example.com - to University of Otago zoology PhD student Amelie Auge, who is doing the study.