Preservation of nile bolti fish (Tilapia nilotica) by combination treatments with gamma radiation

This study is dealing with the application of gamma radiation combined with some other treatments for prolonging the shelf life of fresh bolti fish under cold storage (4+or-1 degree C). Immersing of bolti fish saturated saline solution (25% w/v)containing 15 ppm of chloro tetracycline (CT C) for 15 minutes increased the shelf-life of fish for only two days more than the untreated (6 days). Exposuring the fish after dipping process to 0.5 kGy increased the shelf-life for 14 days while the dose level of 3 kGy gave less short life (11 days). Removing the fish head and intestinal canal instead of salt and CT C increased the shelf life for one week more than untreated ones. Meanwhile, irradiation of these prepared samples with 1.0, 2.5 and 3.5 kGy kept the fish acceptable for 21.24 and 28 days under the same cold storage