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SUMMARY
Analysis of sea-surface temperature patterns along the South African coastline indicates that between 31 °S and 33 °S latitude there is an unusually rapid decline in temperature. This region also defines the southern limit of the distribution of Macrobrachium petersi. Compared with the larvae, post larval M. petersi are less tolerant of high salinity in combination with low temperature. These results may explain the restricted southern African distribution of M. petersi.