Abstract
The toxic effect of heavy metal ( Cadmium ) was investigated using a species of
freshwater aquatic insect - nymph of Ephemeroptera , Cloeon dipterum ( L.) .This heavy
metal was found to have a significant effect on the fine structure of the gills in proportion
to the concentration of Cadmium used ( 0.1 ppm, 0.5 ppm and 1 ppm ) . The results were
supported by ultra structural observation on different types of the gills cell organelles (
gill lamella , nucleus , mitochondria , endoplasmic reticulum and other parts of the cell ) .
Transmission electron microscopy has revealed the disruption and the damage for the
normal cellular organization of the nymph gill cells when the animal exposures for 36
hours in the pollutant media . Most of the freshwater pollution – scientists thought that
this kind of aquatic insects can used as biological monitors of heavy metal pollution . The
aim of the present study is to investigate the poisoning effects of this heavy metal on the
mortality caused by ultra structural damage which is standing behind the death of the
animal and human been .
freshwater aquatic insect - nymph of Ephemeroptera , Cloeon dipterum ( L.) .This heavy
metal was found to have a significant effect on the fine structure of the gills in proportion
to the concentration of Cadmium used ( 0.1 ppm, 0.5 ppm and 1 ppm ) . The results were
supported by ultra structural observation on different types of the gills cell organelles (
gill lamella , nucleus , mitochondria , endoplasmic reticulum and other parts of the cell ) .
Transmission electron microscopy has revealed the disruption and the damage for the
normal cellular organization of the nymph gill cells when the animal exposures for 36
hours in the pollutant media . Most of the freshwater pollution – scientists thought that
this kind of aquatic insects can used as biological monitors of heavy metal pollution . The
aim of the present study is to investigate the poisoning effects of this heavy metal on the
mortality caused by ultra structural damage which is standing behind the death of the
animal and human been .