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For preparing this article, 47 references dealing with the occurrence of species of the fish lice genus Argulus Müller O.F., 1785 infecting fish species in Iraq, until the end of 2024, were consulted. A total of 18 fish species were found to be infected with three species of this genus: A. coregoni. A. foliaceus and A. japonicus, in addition to some unidentified species of this genus. These Argulus species were recorded from one, 18 and three fish host species, respectively, in addition to unidentified Argulus species from four fish species. Such parasites were reported from the infected fishes in different water bodies (rivers, canals, lakes, marshes and drainage networks) and from some fishponds and hatchery in addition to some fishes from fish markets in different parts of Iraq. Ten of these fish species were infected with only one Argulus species, while eight fish species were infected with two Argulus species.

A survey of 145 literature concerning the occurrence of the acanthocephalan genus Neoechinorhynchus parasitizing fishes of Iraq, indicated that there are 12 identified species of Neoechinorhynchus as well as some unidentified species of this genus infecting 34 fish species. The infections were distributed in fishes from Tigris, Euphrates and Shatt Al-Arab rivers and some of their tributaries, as well as in some lakes, marshes, depressions, drainage networks, many fishponds and floating cages in different parts of Iraq, in addition to marine territorial waters of the Arab Gulf. Among the infected fishes, the mugilid fish Planiliza abu was infected with the highest number of Neoechinorhynchus species (ten parasite species), followed by Silurus triostegus (five parasite species), while 17 fish species were infected with only one Neoechinorhynchus species each. Among such acanthocephalans, N. iraqensis was infecting a total of 25 different fish species, followed by N. rutili (16 fish species), while N. australis, N. macronucleatus and N. miniovalis were detected from one fish host species each.

Surveying of 144 literature concerning occurrence of the copepod parasites of the genus Ergasilus parasitizing fishes of Iraq, indicated that there are 11 identified species of Ergasilus von Nordmann, 1832 as well as some unidentified species of this genus infecting 38 fish species. The infections were distributed in fishes from Tigris, Euphrates and Shatt Al-Arab rivers and some of their tributaries, as well as in some lakes, marshes, drainage networks, many fish ponds and floating cages in different parts of Iraq, in addition to marine waters of the Arab Gulf. Among the infected fishes, the mugilid fish Planiliza subviridis was infected with the highest number of Ergasilus species (eight species), followed by Carasobarbus luteus, Cyprinus carpio, Leuciscus vorax and Planiliza abu (seven parasite species each), while seven fish species were infected with only one Ergasilus species each. Among Ergasilus species, E. sieboldi was infecting a total of 25 different fish species, while each of E. iraquensis, E. lizae and E. synanceiensis were detected from one fish host species.

Reviewing literature concerning the occurrence of the causative agent of the white spot disease; Ichthyophthirius multifiliis as well as unidentified Ichthyophthirius species, infecting the skin, fins and gills of fishes in Iraq until the end of 2022, showed that 40 fish species are so far known as hosts for I. multifiliis and five fish species for Ichthyophthirius spp. The infected fishes were distributed in different localities of rivers of Iraq, their branches, some lakes, depressions, marshes, drainage networks, fish hatcheries and fish farms in addition to some fishes from fish markets and fish aquaria. These fishes included 24 endemic freshwater fishes, seven exotic freshwater fishes, one marine fish and seven aquarium fishes in addition to one unspecified aquarium fish species.

Literature review of reports concerning the parasitic fauna of floating cage fishes in Iraq till the end of 2021 showed that a total of 57 parasite species are so far known from three fish species investigated for parasitic infections throughout the country. The parasitic fauna included 15 ciliophorans, three myxozoans, two trematodes, 28 monogeneans, five cestodes, one nematode, one acanthocephalan and two crustaceans. The common carp Cyprinus carpio was infected with all these 57 parasite species, the grass carp Ctenopharyngodon idella with four parasite species and the silver carp Hypophthalmichthys molitrix with only one parasite species.

The paper reviews all the reports concerning the parasitic fauna of the three species of carps cultured in Al-Furat fish farm, Babylon province, mid Iraq. These fishes included the common carp (Cyprinus carpio), the grass carp (Ctenopharyngodon idella) and the silver carp (Hypophthalmichthys molitrix) as well as the mullet (Liza abu) found in the same farm. The parasitic fauna included 60 valid parasite species: ten protozoans, three myxozoans, 29 monogeneans, one trematode, five cestodes, three nematodes, two acanthocephalans, six crustaceans and one mollusc. The common carp was found to harbour 56 species of parasites, the grass carp 25 species, the silver carp 25 species and the mullet six species. The parasitic species were revised and some were synonymised in accordance with latest internet taxonomical accounts. A host- parasite list was prepared for each host species which included all documented literature concerned with this farm.

Surveying 59 references concerning the occurrence of the monogeneans of the families Ancylodiscoididae and Ancyrocephalidae parasitizing fishes of Iraq showed the occurrence of 11 taxa of the family Ancylodiscoididae (genera Ancylodiscoides, Bychowskyella, Chauhanellus, Hamatopeduncularia and Thaparocleidus) and 19 taxa of the family Ancyrocephalidae (genera Ancyrocephalus, Cichlidogyrus, Cleidodiscus, Haliotrema, Ligophorus and Mastacembelocleidus). These monogeneans were reported from 19 valid fish host species in Iraq. Apart from five parasite species which were recorded from marine habitats (Ancyrocephalus sp., Chauhanellus australis, Haliotrema mugilis, Hamatopeduncularia sp. and Ligophorus mugilinus), the remaining parasite species were recorded from freshwater habitats. Among the infected fishes with these parasites, the Tigris catfish Silurus triostegus was infected with the highest number of parasite species (11 species), the mugilid fishes (Planiliza abu and P. subviridis) were infected with eight and seven parasite species, respectively, while 11 fish species were infected with only one parasite species each. Among the parasite species, Thaparocleidus vistulensis was reported from nine fish host species, while 22 parasite species were reported from one host species each. So far, eight synonymous names were applied for seven valid names of parasites of these two families in Iraq.

Literature reviews of all references concerning the parasitic fauna of fishes in fish farms of Babylon province, middle of Iraq, showed that a total of 92 valid parasite species are so far known from the common carp (Cyprinus carpio), the grass carp (Ctenopharyngodon idella), and the silver carp (Hypophthalmichthys molitrix) as well as from three freshwater fish species (Carassius auratus, Liza abu, and Heteropneustes fossilis) which were found in some fish farms of the same province. The parasitic fauna included one mastigophoran, three apicomplexans, 13 ciliophorans, five myxozoans, five trematodes, 45 monogeneans, five cestodes, three nematodes, two acanthocephalans, nine arthropods, and one mollusc. The common carp was found to harbour 81 species of parasites, the grass carp 30 species, the silver carp 28 species, L. abu 13 species, C. auratus one species, and H. fossilis one species. A host-parasite list for each fish species was also provided.