7. Summary and conclusion
Edku lake was one of the richest lakes fish in Egypt ,especially marine fish , accounted for its contribution to Egyptian fish production about 3.5%during 1985,as a result of exposure to the pollution problem and constrains in production ,this ratio reached about 1%in 2010, so that this paper aims to shed light on the effect of Edku lake pollution and compute the effect on lake pollution on income and Maximum sustainable yield and the expected production under this conditions in 2015 to identify the constrains and problems that led to this decline and to development of fish production of Edko lake.