this freshwater crab it was once very common in our rivers, today these rivers are all polluted due to sewage, most of the rivers in the villages of the Tigzirt region in the north of the tizi ouzou department in Algeria are polluted and roads these rivers end in the sea which is considered a receptive environment for any waste of any form, yes living conditions are improved in our homes of course, but to the detriment of nature.
all sanitation networks end with the installation of settling and filtration basins but which are infunctional. Water crabs are once testimonial to the purity of water and also testify that man was more human than today.