Aspects of the biology of 27 fish species inhabiting the shallow Lake Liarnbezi are discussed. Gill and seine nets were used to collect fish over an eighteen month period from five stations in the lake.
Water quality surveys undertaken in the Etosha National Park between October 1974 and August 1979, indicated that the water-holes in the area and faecally contaminated. The bacteriological quality is worst during the dry season. Eighteen per cent of the water-holes tested faiIed to meet the chemical Livestock Drinking Water Standard (D standard) of the Department of Water Affairs, South West Africa.
A very exposed beach and a moderately exposed beach near Walvis Bay were quantitatively surveyed in terms of their macrofauna and meiofauna abundance and biomass. With the exception of a new species of mysid, Gastrosaccus sp, nov., all intertidal macrofauna species have wide distributions in southern Africa.
Radiation measurements were performed at remote sites in the Namib Desert where ecological research projects are being undertaken. Since the radiation environment plays an important role in the ecology of desert plants and animals, the aim of this study was to make this information available to researchers working in the area, incident short-wave radiant density, net radiant density, soil heat flux density and soil surface reflection coefficients were measured in the dunes and gravel plains along an east-west gradient, in the Namib Desert
Mortalities of birds caught for the bird export trade were investigated between August and September 1982, There was a mean mortality rate of 6,5 % from the time of capture to the time of export. Stress due to handling was the greatest cause of mortality. Other deaths were a consepuence of overcrowding and insufficient care with confinement during capture and transport.