Samples of A. latisetosa were collected monthly from 22 stations among Lake Qaroun during January - December 1993. The bathymetrical distribution, the different biometrical characteristics and length - dry weight relationships were estimated.The nauplius larvae represented 88.31 % of the total number of the developmental stages followed by copepodite stages (7,96 %), whereas the adult stage represented 3.73 % only.The maximum counts of the total number were recorded at the east and south of the lake. The peak of flourishing for nauplius larvae, copepodite stages and adults was mostly recorded during winter, summer, and spring respectively,The total body length ranged between 0.7164 mm to mm 0.9060 for females and 0.8171 mm to 0.8994 mm for males. The average dry weight of females was 3.520 \ig whereas that of males was 2.202 \xgr