The Namibian stock assessment model currently does not distinguish between M. paradoxus and M. capensis, let alone between different subcomponents of the M. capensis stock; this opens up the possibility of the existence of a serial depletion of subspecies and populations and a corresponding reduction in biodiversity in these fisheries. If more effort were made by fisheries scientists to involve fishers in the data-collection process, it may be possible to separate landings data based on subspecies, or at least, given spatial and temporal differences in distribution, to begin to estimate fishing mortalities at this level. Skippers are routinely providing logbook data on catches as part of the fisheries regulations.