2 literature references:

Author: FAO-FIES
Year: 2010
Title: Aquatic Sciences and Fisheries Information System (ASFIS) species list.
Source: Retrieved from http://www.fao.org/fishery/collection/asfis/en, March 2010.
Author: Bianchi, G., K.E. Carpenter, J.-P. Roux, F.J. Molloy, D. Boyer and H.J. Boyer
Year: 1999
Title: Field guide to the living marine resources of Namibia.
Source: FAO species identification guide for fishery purposes. Rome, FAO. 265 p., 11 colour plates.