This paper provides results for a preliminary GLM standardisation analysis of the CPUE data for the South African horse mackerel (Trachurus trachurus capensis) midwater fishery from commercial trawl data. The series is to be used as part of an updated horse mackerel assessment. The data, provided by Jan van der Westhuizen (pers. commn), cover a variety of vessels and fisheries. However, the Desert Diamond accounted for the vast majority (81 percent) of the horse mackerel caught. Therefore, this GLM uses only data recorded by the Desert Diamond, a midwater trawl vessel, which covers the years 2003-2010.