T he chemical composition of flesh and carapace of the freshwater crayfish (Procambarus clarkii) was determined. The relationship between body weight, total length, yield of meat and carapace was established.Average chemical composition of the flesh of male was determined to be 7% moisture, 3.1% fat, 10-2% ash, 17.5% carbohydrate, 62.2% protein, calcium 2843 mg/lOOg, phosphorus 343.6 mg/lOOg; iron 11.7mg/100g, zinc 15.1mg/100g, Selenium 0.9 mg/ loog. The present study reveals that the higher protein content in muscle of males may be due to its faster growth rate than females. Moreover, it was indicated that the present investigated crayfish contains more phosphorus than fish and the carapace contains a higher values of iron, fat and carbohydrate than muscles.Thus, it is safely to conclude that the flesh of P. clarkii is recommended to stand as a source of animal protein for Egyptian citizens and its carapace can be used as a forage for animals, 20 Mohamed H. Mona et al

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Leuirus quinquestriatus, Androctonus amoreuxi and Androctonus australis are venomous scorpion in Egypt. Their venom is complex mixture of salts, neurotoxins, peptides and proteins which has therapeutic applications, and can rapidly kill a broad range of microbes. Estimations of total proteins of the venom indicated that L. quinquestriatus had the highest value than the others (10.64 ± 0.04). Hemolytic activity of human erythrocytes was detected and showed that all concentrations (20, 8 and 5 mg/ml) of tested scorpion species crude venom have hemolytic activity against human erythrocytes. The present study was conducted to evaluate the antimicrobial activity of the three Egyptian scorpion's venom against four Gram-positive and negative bacterial strains (Bacillus cereus, Bacillus subtillis, Citrobacter freundi and Klibsella pneumonia) in addition to one fungus species Candida albicans. The results show that L. quinquestriatus venom has a significant antibacterial effect against B. subtillis and C. freundi. In contrast, A. amoreuxi and A. australis venoms do not have a noticeable effect on tested microbes. So, the aim of the present study was to investigate the antimicrobial activity of crude venom against Gram-negative, as well as Gram-positive bacteria, fungi and to evaluate the hemolytic activity of the three investigated species on human erythrocytes.

T he chemical composition, minor and major elements concentration and microstructure of juvenile and adult shells of Sepia officinalis were investigated by using electron X-rays and scanning electron microscope. The results generally showed significantly higher metal concentration in the juvenile shell than in the adult one, except calcium and aluminum. However, the highest accumulation was for copper, lead, and cadmium. The relationships between metal concentration and shell length, weight, and position were determined. However, no relationships between heavy metals pollution and microstructure of the shells of the investigated cephalopod were observed.