دراسة تحليلية للآثار البيئية على الثروة السمكية في جمهورية مصر العربية

الملخص EN

Human being is considered the main cause of sea water pollution, as a result of his negative activity, such as the disposal of industrial waste in the river Nile and the Egyptian lakes and the disposal of sewage and sanitary waste and other sources of pollution, which ultimately leads to the pollution of fish with heavy metals such as mercury, cadmium and lead.

when human being feeds on fish, the proportion of these elements increases in his body, which causes harm to him .

studies of the environmental affairs agency in Egypt confirmed that the river Nile and its branches in the different governorates suffer from a severe pollution problem in its waters, annually nearly 4 billion cubic meters of acid-bearing, agricultural and industrial wastes are dumped carrying organic materials, agricultural pesticides, heavy metals.

the results of the study resulted in a decrease in the quantity of fish production in some fisheries of the republic for both marine waters, fresh waters and rice fields by 18 % , 8 % , and 45 % , respectively.

the study also resulted in a decrease in the quantity of different types of fish production in fresh water during the period of study, as the quantity of production decrease of each of the following : Tilapia-Carp-Bagrus-Sander-Besaria-Lebis-Hanshan by 12% - 46% - 7% - 43% - 69% - 23% - 80%, respectively.

the results of the study also showed that Cairo governorate ranked first in the indicators of Nile water pollution, while the rest of the governorates ranked medium in those indicators, except for the governorates of Qalyubia and Kafr el-Sheikh, which ranked the lowest in pollution indicators.