1. Department of Ichthyology and Fisheries Science (DIFS), Rhodes University, Makhanda 6140, South Africa
2. Department of Fisheries, Choma P.O. Box 630450, Zambia
3. Department of Anthropology, Rhodes University, Makhanda 6140, South Africa
4. Namibia Nature Foundation, Windhoek 10005, Namibia
5. Environmental Sciences, University of Namibia, Windhoek 13301, Namibia