Effect of freezing period on chemical composition, microbial load and some pathogenic ‎bacteria of Nile tilapia (Oreochromis niloticus)‎

Abstract

This study evaluated the effects of freezing periods on nutritional values, microbial ‎loads, and some pathogenic bacteria in Nile Tilapia (Oreochromis niloticus). 8 kg.‎‏ ‏Samples were collected from El-mawourda Fish Market in Khartoum State, for four ‎experimental treatments. The treatments were conducted on the period 0 day, 7 days, 15 ‎days and 21 days.‎‏ ‏It is noticed that the freezing period effect on the nutritional value, ‎microbial load and some pathogenic bacteria of Nile tilapia (Oreochromis niloticus) ‎revealed that the lowest average nutritional assessment of Nile tilapia (Oreochromis ‎niloticus) observed for protein 20% at the third period of freezing (21 days), and ‎minerals were calcium, phosphorus, magnesium, iron, sodium and potassium (5.6 – ‎‎2.7%, 4.8 – 2.9%, 2.6 – 2.9%, 1.1 – 0.71%, 4.5 – 2.8%) respectively. The‏ ‏result of this ‎study clarified that the freezing period has a considerable consequence (p ≤ 0.05) on the ‎chemical composition, microbial load and same pathogenic bacteria (E. coli and ‎Salmonella) of Nile tilapia (Oreochromis niloticus).‎