Updating checklist of fishes of Al-Hawizeh marsh, Southern Iraq until 2018

A total of 24 species were recorded in Al-Hawizeh marsh during from June 2004 to Novmber 2018, belonging to 11 families and 22 genera, including 16 native species and (8) alien species, of which 17 species were recorded in the first study (2008) and 16, 13, 15, and 19 species were in the second, third, fourth and fifth studies2019) ) respectively, Cyprinidae family recorded the highest number with nine species. Eleven common species were recorded between the studies. The cluster analysis results of the species composition in the Al-Hawizeh marsh using the Jaccard Similarity Index showed three main groups. The highest similarity percentage was among the first and second studies, which amounted to 88.2, and the lowest was between the fourth and fifth studies, which amounted to 50.0.