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Crayfish are fresh water crustacean that look like a tiny lobster, fresh water crayfish (Procombarus clarkii) had been introduced accidentally and appear in the River Nile and its resource all over Egypt during the last years. The objective of this study was to evaluate the chemical quality and composition of crayfish as a human food, and to introduce a new high quality crustacean organism as a new cheap source of animal proteins. Total thirty crayfish samples collected from different markets in Alexandria were analyzed for total protein, amino acids using amino acids analyzer, fat, cholesterol, fatty acids (using GLC), ash, minerals, and some heavy metals (using atomic absorption spectrophotometer). Also, total volatile basic nitrogen, pH, free fatty acids, and thiobarbituric acid value as a chemical quality index were measured. The obtained results revealed good freshness and high chemical quality of crayfish, with regard to their ranges of total volatile basic nitrogen (28-35 mg/100g), pH (7.01-7.21), thiobarbituric acid (0.084-0.412) mg molanaldhyde/kg, and free fatty acids (0.56-0.93) mg/kg. Chemical composition and nutritive value of crayfish revealed mean values of total protein, fat, ash, and cholesterol contents 18.076%, 1.057, 1.48%, and 22.417 mg/100g, respectively. Minerals concentrations level were 0.61%, 443.22, and 356.45 g/g for phosphorous, iron, and magnesium, respectively. Amino acid pattern showed that Glutamic, Aspartic, Arginine, and leucine were abundant essential amino acids and oleic acid represented 44% of total fatty acids. Crayfish evoked high nutritional value as respect to higher content of total unsaturated fatty acids (73.689%) with 56.56%, and 15.08% monoioneic and polyioneic (with 3 and 6), fatty acids also, high quality of protein which contain 55.703% essential amino acids. Also, this investigation showed that heavy metals concentration residue decreased in this order zinc > manganese > copper > chromium > cadmium > lead > nickel. Copper, chromium, and cadmium concentration were within the Egyptian permissible limits in all samples, but lead levels exceeded the maximum permissible limits in all samples and zinc exceeded this limit in 75% of examined samples. Information obtained in the present study can assist in developing quality standard for fresh crayfish in Egypt and recommended rules for its safety were mentioned. INTRODUCTION Crayfish, sometime called craw fish, are fresh water crustacean resembling small lobsters (Procambarus clarkii). The fresh water crayfish had been introduced to the Egyptian Nile water recently and widely dispersed in River Nile and its resources all over Egypt. It has been collected during fishing from many locations at the Northern parts of the river Nile. Ibrahim et al., (1996)1, ElMossalami & Emara, (1999), Fisher, (2006) Wikipedia, (2006) 2 Bull High Inst Public Health Vol. 38 C.1 [2008] Crayfish is a cheap source of protein and sea food similar to the much expensive shrimp and lobster, but much less in price and relatively short life span and fact that they lose the accumulation of heavy metals and chemical when they moult. Crayfish are flavorful nutrition and valuable human food (similar to lobster) and are sold in fish market throughout the world, every year nearly 75.000 tons valued at over $50 millions are produced in U.S.A alone. Helfrich, & Distelano (2003), and Fisher, (2006) Crayfish is also eaten in Europe and China but they are most popular in Louisiana. It is formed commercially and consumed in various dishes. They can be prepared like lobster, turn bright red when cooked. Some evidence shows that Procambarus clarkii feed well upon some benthic vector snails, so it might be used as a potential biological Schistosoma control agent. Also, for new medical problem in Egypt (Faschiola infection in human), Crayfish also are important indicator of water quality and environmental health, flourishing in clean water and perishing in polluted water. The flesh of P. Clarkii is recommended to stand as a source of animal protein for Egyptian Citizen and its carapace can be used as farage for animals. Fisher,(2006) and Baheyeldine, (2007) As the crayfish has become important resident in River Nile, it is necessary to determine the chemical quality and composition of crayfish as a food. The aim of this study is to introduce a new high quality crustacean organism and thus adding a new cheap source of animal proteins which we badly needed. MATERIAL AND METHODS Sampling Thirty samples (500 g of each) of fresh water crayfish (Procombarus clarkii) were collected alive from different markets in Alexandria. The samples were transported to the laboratory in isolated ice boxes for various examination. Crayfish are prepared

Evaluation of Chemical Quality and Nutrition Value of Fresh Water Cray Fish (Procambarus clarkii)