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ii Species diversity, richness and composition of fish in bottom-trawling were investigated off the Namibian coast between Oranjemund and Henties Bay. Sampling followed a systematic transects design, along latitude gradients (28-22oS) at different seafloor depths (100-500m). In total 18 transects were sampled containing 105 stations. At each trawled station the whole catch was sorted into species type and the total body mass (kg) of each fish species was recorded. A total of 91 fish species were sampled in the study area. Environmental factors, in particular bottom water temperature, dissolved oxygen and salinity were recorded automatically by the CTD instrument. Results indicated significant differences in means of fish species diversity (F = 14.01, df = 4, p < 0.001) and richness (df = 4, p < 0.001) at different seafloor depths. Deeper areas were more diverse than shallower area. With regard to latitudinal transect gradients significant differences were observed in means of fish species richness (df = 6, p < 0.05) but not diversity (F = 1.28, df = 6, p> 0.05). The hierarchical cluster analysis on specie