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Abstract
A total of 860 fish samples [400 from each of fresh water fishes
(represented by Tilapia spp. and Clarias lazera) and marine fishes
(represented by Mugil spp. and Sardine) beside 60 samples of smoked
Herring fish] were randomly collected from Damietta city fish markets
from April 2004 to March 2005 through four seasons (Spring, Summer,
Autumn and Winter). The collected samples from fresh and marine water
fishes were examined for prevalence of encysted metacercariae and
submitted for some treatment methods to study their effect on infectivity of
existed metacercariae.
The results declared that metacercariae detected in fresh water fishes
with a percentage of (82%) and (87.5%) for Tilapia spp. and Clarias lazera
respectively.
Concerning seasonal variation, the results declared that the highest
infection of the examined fish samples was found during Summer seasons
90% of Tilapia spp. and 98% for Clarias lazera followed by Autumn 84%
and 90% then Spring 82% and 84% and the lowest infection was found