20 May 1980
South Africa was one of the original twenty-two nations who signed the multilateral Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR, pronounced 'kammelar'), in Canberra, Australia. CCAMLR entered into force in 1982 in order to regulate exploitation of marine living resources in the seas south of the Antarctic Polar Front, including the area around the Prince Edward Islands, two small, uninhabited islands in the sub-antarctic Indian Ocean that are politically part of South Africa. A South African scientist is currently chairman of the Scientific Committee.
References

Burger, D. (ed)(2002. South Africa Yearbook 2001/02, Pretoria: GCIS, p. 222; Kalley, J.A.;|Schoeman, E. & Andor, L.E. (eds)(1999). Southern African Political History: a chronology of key political events from independence to mid-1997, Westport: Greenwood.

https://www.mcm-deat.gov.za/international/ccamlr.html