Received: 2 April 2021
Accepted: 26 July 2021
First Online: 21 August 2021
: Animal tissues were sampled following internationally recognized standard methods in line with the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) and its Ecosystem Monitoring Program (CEMP) and were permitted under the Antarctic Marine Living Resources Act.
: Not applicable.
: The authors declare that they have no competing interests.