Indicator organisms must be sufficient to yield meaningful
data, and must have a community structure that changes in
response to the ecosystem stressors of interest, thereby allowing
identification of the community attributes which would
be expected to be present under unimpacted reference conditions.
The results of this study revealed that many species satisfied
the indicator selection criteria as indicator species in
Ismailia Canal and its branches. In this context, C. placentula
had the highest optimum conductivity (494 lS/cm) and optimum
reactive phosphorus (61 lg/L). C. placentula was
reported by Van dam et al. (1994) as species thrive in