Some harmful agents in canned fish

I. Chemical examination:One hundred and fifty canned fish samples, 50 of each (cannedtuna, canned mackerel and canned sardine) were collected fromdifferent sites in Egypt. Muscle samples from collected fish weredigested and analyzed by thin layer spectrophotmeter for determinationof histamine concentrations.The obtained results revealed that the overall mean of histamine incanned tuna, canned mackerel and canned sardine were 10.07,5.86 and7.35 mg/l 00 gm fish respectively. All canned mackerel samples werewithin the permissible limit while 46% of canned tuna samples wereabove the permissible limit and 20% of canned mackerel exceedingthis limit.11. Heavy metals determination by using Atomic absorptionspectrophotometer:The study revealed that the mean concentration of lead, cadmium,mercury and tin were 1.985, 0.007, 0.449 and 64.1 respectively incanned tuna where in canned mackerel were 2.532, 0.005, 1.016 and66.07 respectively and in canned sardine were 2.419, 0.005, 0.404 and67.9 respectively.Concerning the permissible limit set in Egypt 68% of canned tuna,72% of canned mackerel and 68% of canned sardine were exceedingthe Pb limit (l.0 ppm); whereas for Cd and Sn all samples were withinthe limit (0.1 and 150 ppm, respectively) while for Hg 26% of canned tuna, 54% of canned mackerel and 10% of canned sardine were above