Determination of Quality and Shelf Life of Some Commercial Freshwater Fish Based on Total Volatile Basic Nitrogen TVB-N in Khartoum state

Abstract

This study was carried out to evaluated the quality and shelf life of 3 freshwater fish (Bagrusbagrus ,Orechromisniloticus and Latesnlioticus) based on total volatile base nitrogen test (TVB-N) .The studied fish was collected a life from South Omdurman kept under ice and immediately transferred to laboratoryand store in deepfreeze(0◦c) for 3days . The samples was kept in refrigerator at (4◦c) for further analysis. The total volatile basic nitrogen (TVB-N) test become use for assesses the quality and shelf life of fresh fish using Magnesium Oxide Method. This method was repeated every 5 days for 35 days . The result revealed that the TVB-N ratio in the (Bagrusbagrus ) was reached the recommended limitation which was 30mg/100 at interval time of 30 days .While the two other species (Oreochromisniloticus and Latesniloticus) were reached the recommended limitation in interval time of 25 days . The results showed that there was no significant different between the species (P >0.05). Generally, the study showed that the expiratory period of thefreshwater fish when kept freezer at 4c◦was range between 25-30 days.