الفهرس | Only 14 pages are availabe for public view |
Abstract Parasitic infestation is greatly found in marine and freshwater fishes of Egypt. During the present study, a total of 1000 marine and freshwater fish belonging to 12 families; Cichlidae, Synodontidae, Mullidae, Moronidae, Sparidae, Mugillidae, Soleidae, Carangidae, Centropomidae, Serranidae, Lutjanidae and Clupeidae have been examined for internal helminthes. The hosts were collected from three areas at Egypt; Manzala lake at Damietta, Mariout lake at Alexandria and Brullus lake at Kafr El- Sheikh province during the period from 2011 to 2014. A total of fourteen species of endoparasites were identified and described using light microscope. Those species are: eight digenean trematodes; Lecithochirium fusiforme Lühe, 1901, Lecithochirium aegyptiacus n. sp., Tubulovesicula nagatayi n. sp., Pseudopecoelus mullatus n. sp., Azygia hwangtsiyui Tsin, 1933, Hemiurus sardinai n. sp., Elytrophallus manteri n. sp. and Elytrophalloides oatesi Szidat, 1955. Two nematodes; Hedruris lutjanenses n. sp. and Philonema oncorhynchi Kuitunen-Ekbaum, 1933. Four acanthocephalans; Serrasentis yamaguti n. sp., Gorgorhynchus alexandrinus n. sp., Longicollum mugelli n. sp. and Rhadinorhynchus sp. Lühe, 1911. Three species of the above mentioned were described using Scanning Electron Microscope; Hedruris lutjanenses n. sp., Philonema oncorhynchi Kuitunen- Ekbaum, 1933 and Gorgorhynchus alexandrinus n. sp. Some new hosts and geographical records were established in the present study. The endoparasitic community had an overall prevalence (34.2%) and mean intensity of 2.94. A comparison between the infection by helminthes in the three studied areas was estimated and discussed. Mariout lake had the highest infection rate by helminthes (38.4%) followed by Manzala (34.5%) and the lowest infection rate was recorded in Brullus lake (27.2 %). The helminthic community in the present study was dominated by trematodes (56.14%) followed by acanthocephalans (25.14%) and the lowest incidence was recorded for nematodes (24.56%). The effects of modifying factors such as season, weight and sex of the hosts on the abundance of parasites were also illustrated and discussed in the present survey using statistical studies. The seasonal incidence of the total parasite species showed maximum prevalence during summer (46.8%) while the lowest infection rate was recorded during fall season (25.5%). Males had the higher infection rate (55%) than females (45%). The histopathological and histochemical impacts due to the infection by the nematode Philonema oncorhynchi Kuitunen- Ekbaum, 1933 and acanthocephalan Longicollum mugelli n. sp. on some organs of Lates niloticus and Mugil cephalus fish were studied. Also, the haematological effects in the infected previous fish species were illustrated and compared with noninfected hosts. |