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The life history of the freshwater shrimp Palaemonetes antennarius (H. Milne Edwards, 1837) was investigated from April 1993 to November 2002 at 13 sites in the delta of the Neretva River, Croatia. The sex ratio (males vs. females) was in favour of females throughout the study year (ׯ±SD=0.70±0.12). The breeding period lasts from April to August with a peak of 75% of the ovigerous female in June...