الفهرس 
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Abstract
Chapter V
Summary
English Summery
The present study aimed to investigate the effects of
sublethal concentrations of selected heavy metals (Zn, Cu, Cd
and Hg) on different biological aspects (growth,
respiration, ... etc) of two dominant bivalve species B. variabilis
and R. decussata in Lake Timsah.
Growth of the two species, respiration, cumulative
mortality, the intensity and the number of protein bands and
histopathological changes of the digestive gland, gills and foot
were used as biological tools to investigate the influence of
these elements.
The achieved results can be summarized as follows:
A- Growth:
Increasing sublethal concentrations of Zn, Cu, Cd and Hg
inhibited growth rate of juveniles of both species. Mercury and
cadmium have much higher inhibitory effect than Cu and Zn.
The inhibitory effect ranked in the following ascending order
Zn, Cu, Cd and Hg.
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