الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This study aimed to improvement of productivity in some cultured shrimp species under Egyptian conditions through study the factors affecting the shrimp production and its improvement. This study was carried out on the shrimp farms of Berket Ghalioun during the period extended from 2017 to 2019 in the months of March to November from each year. This study was carried-out on two types of shrimp that includes Litopenaeus vannamei shrimp (White leg shrimp) and Fenneropenaeus indicus shrimp (Indian white shrimp). The shrimp dams of the two species (Vannamei and Indicus) imported from America and Cyprus and brooded in the hatchery of shrimp that found in Berket Ghalioun farm. Two ponds one specialized for breeding of Vannamei shrimp and the other for breeding the Indicus shrimp. Our results concluded that: 1. The water characters temperature, Dissolved oxygen, pH, and salinity is very important for improving the shrimp performance. 2. The body weight, body weight gain, food conversion and livability % improved in Litopenaeus vannamei shrimp higher than that of Fenneropenaeus indicus shrimp. 3. The using of polyethylene pond improve the shrimp production than the soil ponds. 4. Central drain system is more profitable and cleaner than peripheral drain 5. Litopenaeus vannamei shrimp (White legs) shrimp is efficient in its production and performance under Egyptian conditions than the other types of shrimp as Fenneropenaeus indicus shrimp. 6. There is a recorded genetic variation among shrimp species being very useful to operate gene expression to determine the preferred shrimp breed, and preventing commercial fraud caused by the inadvertent substitution of species due to phenotypic similarities, or deliberate replacement of higher quality species by others of lower quality may occur, these leading to mislabelled adulterated products.