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Abstract
In the present study, 10 species of marine water fishes (Pagrus pagrus, Argyrosomus regius, Morone labrax, Mullus surmuletus, Scomberomorus commerson, Atherina, Saurida undosquamis, Euthynnus affinis, Sardinella spp. and Trachus mediterraneus) were collected from Suez Canal area (Suez and Ismailia Provinces) in the period extended from April 2006 till March 2007.
Out of 441examined marine fishes specimens, 339 (76.87%) have been found to be infected with one or more species of helminth parasites. The infection rate in different species of fish was higher in Atherina, Euthynnus affinis and Trachus mediterraneus (100%), followed by Pagrus pagrus (92.18%), Sardinella spp. (87.5%), Argyrosomus regius (76.47%), Morone labrax (60%), Scomberomorus commerson (48.27%), Saurida undosquamis (41.86%) and in Mullus surmuletus (39.65%).
The collected parasites include nine species of trematodes (Erilepturus lemeriensis, Lecithocladium excisum, Allostomachicolina secundus, Lethadena profonda, Dinosoma rubrum, Podocotyle parupenai, Podocotyle angulata, Cainocreadoides serrani and Propycnadenoids secundus), six species of cestodes larvae (Ligula intestinalis, Proteocephalus sp., Ophiovalipora minuta, Tetraphyllidean larvae, Pleurocercoid larvae and Plerocercus larva of Trypanorhyncha), five species of adult nematodes (Hysterothylacium reliqueus, Hysterothylacium bidentatum, Spirocamallanus sp., Oncophora melanocephala and Spinitectus inermis), two species of larval nematodes (Anisakis simplex larvae and Anisakis sp. larvae) and one acanthocephalan (Bolbosoma vasculosum).
The prevalence rate of infection with trematodes, cestodes larvae, adult nematodes, larval nematodes and acanthocephala was 32.65, 23.35, 14.74, 37.64, and 2.04%, respectively.
Concerning the seasonal dynamics of helmith parasites in the examined fish species, it was found that, the highest infection rate was in Spring (91.86%), followed by Winter (77.88%), then Summer (72.34%), while the lowest one was in Autumn (64.16%).
The taxonomy and morphological characters of each collected parasite was including in the present work, with notes on the histopathological changes.
Moreover, the ultrastructure of the plerocercoid larvae Ligula intestinalis and Anisakis simplex larvae were studied using scanning electron microscope (SEM).