Reviewing the literature on all the nematodes parasitizing 45 species of freshwater and marine fishes of Basrah province (eight elasmobranchs and 37 teleosts) indicated the presence of 48 nematode taxa. Thirty-five of such nematodes were recorded from marine localities against eight taxa from freshwater localities and two taxa from both marine and freshwater localities. These nematodes belong to two classes, three orders and eight families. All such nematodes belong to the class Secernentea except two taxa which belong to the class Adenophorea. Orders Ascaridida and Spirurida are represented with 22 and 24 taxa, respectively, while order Enoplida has only two taxa. The total number of nematode species recorded for each fish host species fluctuated from a minimum of one nematode species in 17 fish hosts to a maximum of eight nematode taxa in Cynoglossus arel only. Number of fish hosts reported for these nematodes fluctuated from one host in case of 31 taxa to a maximum of 20 hosts in case of Contracaecum sp. 1 larva.
Reviewing the literature on all the crustaceans parasitizing freshwater and marine fishes of Basrah province, Iraq indicated the presence of 74 crustacean taxa. Sixty-five taxa belonged to the class Maxillopoda while nine taxa belonged to the class Malacostraca. All these crustaceans were adults living on the external surface of their fish hosts while three taxa were reported as larvae. Fifty-five species of such crustaceans were recorded from marine localities, 11 from freshwater localities and the remaining were from both freshwater and marine localities. The total number of crustacean species recorded for each fish host species fluctuated from a minimum of one crustacean species in 31 fish hosts to a maximum of 15 crustacean species in Chelon subviridis only. Number of fish hosts reported for these crustaceans fluctuated from one host in case of 45 crustacean species to a maximum of 18 hosts in case of praniza larvae of Gnathia sp.
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