The effect of gamma rays on shelf life of grass carp (Ctenopharyngodon idella) fillet in the refrigerator condition

Various ways to increase the duration used for food storage, among whom radiation can be used as an effective way to retard spoilage in food in particular is concerned with the origin of the fish. In this study 50 grass carp (Grass carp) (Ctenopharyngodon idella) (mean weight 1-1.5 kg) for gamma irradiation with cobalt-60 source by doses of zero, 1.5, 2.5 and 3.5 kGy chosen and then change microbial load and total volatile nitrogen in the days 1, 7 and 14 were evaluated under the conditions of storage in refrigerator. These research results demonstrate the significant decline in aerobic mesophilic bacteria and T.V.N in the irradiated samples in comparison with non-irradiated samples. In this study, given that the dose of 3.5 kGy dose caused a significant decrease in comparison with other (standard range) T.V.N values and aerobic mesophilic bacteria was in the refrigerator until the seventh day. Therefore, in Grass carp using it (3.5kGy) as the best dose to prevent corruption is recommended in seventh days.