الفهرس 
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Abstract
This study was carried out on 1100 fish specimens (800 Marine fishes and 300 freshwater) of
different fish species (100 fish ! species) and of different body weights and sizes were
randomly collected alive at different seasons (25 fish ! season). Marine fish specimens
(Lutjanus sp., Pagellus acarne, Siganus rivulatus, Sardina pilchardus. Decapterus
macrosoma, Etrumeus teres, Rastrelliger kanagurta and Decapterus russilli) were collected
from Suez Canal area. While, the Freshwater fish specimens (Lates niloticus, Clarias
gariepinus and Oreochromis niloticus) were collected from Ismailia Canal and its tributaries.
The clinical examination of naturally infected marine and freshwater fishes with parasitic
nematodes revealed no pathognomic clinical abnormalities except slight emaciation and slight
abdominal distension. The postmortem examination of marine fishes elicited that the internal
organs were generally pale and slightly enlarged. Some cases of infected Siganus rivulatus
showed the presence of Procamallanus inopenatus in the intestine, while in freshwater fishes,
Lares niloticus revealed the presence of Contracaecum sp. larvae (whitish in color) mainly free
in the body cavity. Clarias gariepinus, showed congestion of the liver and intestine as well as
swelling of the stomach and intestine in some cases. Oreochromis niloticus, showed the
presence of Amp/icaecum sp. (nematodes larvae) in sinus venosus and branchial region with
liver congestion. The identified parasitic larval nematodes among examined marine fishes were
Anisakis species, Contracaecum ovale, Contracaecum spJ and Hysterothylacium HB, while,
the adults nematodes were Hysterothylacium bidentatum, Procamallanus inopenatus,
Raphidascaris acus and Rhabdias bufonis. The total prevalence of parasitic nematodes among
examined marine fishes was 62.88% (503 out of 800). The highest prevalence was in
Decapterus russilli (86%) followed by Rastrelliger kanagurta (74%), Siganus rivulatus (67%),
Etrumeus teres (66%), Decapterus macrosoma (63%), Pagellus acarne (60%), Sardina
pilchardus (55%), and Lutjanus sp. (32%). In Freshwater fishes, the total prevalence of
parasitic nematodes was 34% (102 out of 300). The highest prevalence was in Lates niloticus
(66%) followed by C. gariepinus (30%) and 0._ niloticus (6%). The identified parasitic larval
nematodes among examined freshwater fishes were Contracaecum species, Amplicaecum
species beside, the adult nematodes were Paracamallanus cyathopharynx and Procamallanus
laeviconchus.