Abstract
Four specimens of the freshwater palaemonid prawn, three Macrobrachium australe and one M. lar, were collected in the Koonoura River, Nagasaki, Japan. The former is the first record in Nagasaki Prefecture. Occurrence of these species was thought to be due to larval dispersal by branched flow from the Kuroshio Current. However, these two species are unlikely to overwinter, because the samples are only subadults and the water temperature of this river drops below 10 °C in winter.
