الفهرس 
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Abstract
Fish deteriorative changes could be occurred directly after catching, storage and retailing. One hundred samples of Scomber scombrus (S. scombrus), Clupea pilchardus (C. pilchardus), Pagrus pagrus (P. pagrus), Oreochromis niloticus (O.niloticus), and Mugil cephalus (M. cephalus) (20, each) were randomly collected from different fish markets at Dakahlia Governorate, Egypt. The mean values of pH, total volatile basic nitrogen (TVB-N mg/100g) and thiobarbituric acid (TBA mg/ kg) were 6.52 ± 0.11, 37.75 ± 4.79 and 3.91± 1.7; 6.45 ± 0.28, 41.41 ± 5.62 and 3.25± 1.24, 6.58 ± 0.06, 45.97± 6.61and 3.25± 1.4; 6.75 ± 0.22, 23.5 ± 3.35 and 1.20± 0.42; 6.68 ± 0.16, 30.82 ± 4.32 and 1.75± 0.38 in S. scombrus, C. pilchardus, P. pagrus, O. niloticus and M. cephalus, respectively. The histamine value in, S. scombrus significantly higher (p < 0.05) than examined species but all examined samples within the permissible limit.