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This study was conducted to find out the nutritional value of tilapia fish found in Ain Tawergha water. As well as to assess the suitability of Ain Tawergha water for growth and development of Tilapia fish. Samples of tilapia fish were caught directly from the Tawerghan basins by fishing nets, and water samples were taken from the same fishing site for analysis. The results obtained from the water samples indicated that the quantities of calcium, magnesium, sodium, and potassium were 292, 147, 494 (and 33 mg/l), respectively, while the amount of chlorine was 915 mg / l, and the water pH was 7.4 and the total dissolved salts were 2940 mg /l. The water was good in transparency and clean without turbidity. The results also showed that the amount of protein , carbohydrates and fats in fish muscle were 22.086 , 0 and 1.87 g, respectively. The minerals in muscles, calcium, iron and sodium were 12, 0.54, 56 mg, respectively. The cholesterol n muscles was 50 mg. It was also found that tilapia was rich in important fatty acids for the body (omega-3, which was 0.14 mg). Keyword : Tilapia fish, Ain Tawergha water, Food elements. INTRODUCTION The marine life of seas, lakes and rivers is a source of food for many people and an important resource to support the national economy and is considered an important source for building the human body because it contains the protein necessary for its health and safety) (1) . Among the most important ones is tilapia, whose protein content is estimated at more than 22.50%, and is characterized by ease of digestion and metabolism compared to other meats (2) . Tilapia ranks third among the most consumed types of fish in the world, coming directly after carp and salmon, and the demand for tilapia has increased significantly (3) . Tilapia fish includes about 100 species that are spread naturally in Africa and Central America until Mexico and the northern part of South America and India. Africa is the natural habitat of the group of tilapia fish, and it was noticed that some naturally occurring tilapia appeared in the Middle East region up to Syria in the north, with some species in Lake of Tiberias (4) . Tilapia fish were brought to Ain Tawergha water in Libyan for more than (50 years) (5) . Tilapia is a herbivorous, vegetarian fish whose main food is algae and plant bacteria that live in fresh water and it is characterized by fast growth and its high capacity for endurance, and it lives in fresh water (6) and in hot regions and it dies if the water temperature drops below 10 °C. It is highly tolerant of lack of dissolved oxygen in the water and increased salinity, as these fish have reproductive and behavioral characteristics that differ from the rest of the fish The length of an adult tilapia fish ranges from 6 28 cm, and the maximum recorded weight of a fish of this type is more than 4kg and becomes sexually mature at age of few months (7) . This study aims to identify the value of nutrients (protein, carbohydrates and fats) and mineral elements, fatty and amino acids in addition to vitamins in muscles of tilapia grown in Ain Tawergha water, Libya. Also, to investigate the suitability of water there for the development of this fish species.

Estimating the value of the dietary elements of tilapia fish in Ain Tawergha water, Libya