Diversity of crustaceans in the euphrates River/Najaf province-Iraq

To study the biodiversity of crustaceans, five sites were taken with three replicates from each sample over a period six months, November 2021 to April 2022. Samples also taken. Water is used measure some chemical and physical properties. The density crustaceans ranged (4-773) individuals / liter, month March recorded highest density. results isolation identification showed following species cyclops, Diaptomidae, Acroperus harpae, Daphnia sp, Bosmina Ceriodaphnia quadrangula, galeata, A amphipod Hyallela, Diaphanosoma brachyurum, Simocephalus vetulus sp. According relative abundance index (Ra) first site throughout research had while remaining It Crustacean Species constancy Index (S) that among at sites, Cyclops, quadrangula most persistent. values richness (D*) between 0.67-4.66. While Shanon-Weiner 0.346-2.76 bit/ind. homogeneity (E) 0.499-1.256.