الفهرس 
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Abstract
The present study was carried out on 405 fishes including177 freshwater fishes (84 Bagrusbajad and 93 Synodontisclarias),and 228 marine fishes (90 Caranxcrysos, 82 Pagruspagrusand 56 Thunnussp), from fish markets in the period extend from the beginning of January 2012 till January 2014.Concerning with the present study, the total number of infected freshwater fishes was 105 with rate of infection 59.3%, while in marine fishes was 165 fishes with rate of infection 72.3%. By discussing the seasonal dynamics, it was found, in fresh water fishes, in winter the infection rate was 32.8%, in spring 40.3%, in summer 87.5%, and in autumn 82.3%. While in marine fishes, in winter the infection rate was 68%, in spring 91.9%, in summer 72.8%, and in autumn 54.3%.The collected parasites from freshwater fishes was, trematodes, (Allocreadiumelongatum, Allogomtiotremaattu, Allostomachicolasecundus, Clinostomumcomplanatum, Metagonimus sp., Myzotusvitellosus¸Orientocreadiumbatrachoides, andStephanostomum sp.), cestodes, (Monobothrium sp., and Polyonchobothriumclarias) and nematodes, (Anisakis simplex and Camallanusacaudatus).The collected parasites from marine fishes was, trematodes, (Dissosaccuslaevis, Glomercirrusmacrouri, Lecithocladiumexcisum, Lecithochiriumfusiformi, Mitrostomanototheniae, and Parahemiurusmerus) cestodes, (Ligula intestinalis), nematodes, (Contraceacum sp., Hysterothylaciumaduncum, Hysterothylaciumreliquens, and Pseudoterranova sp.) and acanthocephalans, (Serrasentissagittifer).Histopathological changes in the stomach and the intestine of both freshwater and marine fishes were shown as; some degenerative changes in the mucosa and congestion of blood vessels.