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The copepods <i>Acartia natalensis</i> and <i>Oithona brevicornis</i> reached high population densities and numbers exceeding 100 000/m<sup>3</sup> of water were recorded. Mysids were major contributors to zooplankton biomass. A maximum biomass of 1 200 mg/m<sup>3</sup> was recorded in February in the middle estuary and was attributed to the mysid <i>Mesopodopsis africana</i>. 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