Abstract
A total of 538 samples of edible fish Johniuss dussumieri (Valenciennes, 1833), locally called ‘Mushka, from Karachi
coast were examined for helminth infection from January 2009 to December 2009. Out of 538 fish, 266 were found to
be infected with helminth parasites (cestodes, nematodes, trematodes and acanthocephalans), with prevalence rate of
49%. As regard to the trematodes infection, out of 266 fish, 119 individuals of Olivacreadium heterorchis (Bilqees,
1976) and 28 individuals of Pleorchis heterorchis (Shaukat, 2008) were recovered. O. heterorchis occurred maximum
in the months of July and November, 2009 and that of P. heterorchis in the month of September, 2009. A negative
association was observed between the two trematodes using a Chi-square test of association.
