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In freshwater the abundance of Cladocera is more than saltwater, so the results noted that the Cladocera
predominated in the first station (Al-Ashar) recording five species and amounted to 73.3% of the total
zooplankton while at the second station (Abu Al-Khasib) only two species were recorded and amounted to 4.2%
of the total zooplankton. As for the third station (Al-Faw) only one species of Cladocera was recorded and was 0.1%
of the total zooplankton, while conversely the group Copepoda intensity increased in saltwater more than in
freshwater. In the third station dominance of Copepoda was noted due to increased concentration of salinity. Also
the results have shown dominance of Cyclopoida group (74.3%) in the first station and dominance of Calanoida in
the third station. This is consistent with the study of Ajeel (1990) and (2004).
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