1. Department of Fisheries and Ocean Sciences, University of Namibia, Henties Bay, Namibia
2. Uideritz Marine Research, Ministry of Fisheries and Marine Resources, Uideritz, Namibia
3. Current address: Ministry of Environment, Forestry and Tourism, Windhoek, Namibia
4. Department of Forestry, Fisheries and the Environment (DFFE): Branch Oceans and Coasts, Cape Town, South Africa
5. Marine Apex Predator Research Unit (MAPRU), Department of Zoology and Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha, South Africa
6. Current address: Sea-Coast-Desert (SEACODE) Research Group, Uideritz, Namibia