Abstract:In this paper,quality changes in Pampus argenteus during chilled storage(4+1) ℃ were investigated in the aspects of sensory,pH value and aerobic plate count(APC),and its bacterial flora changes were also qualitatively and quantitatively studied. The results showed that TPC and the mean values of pH of sample at the initial storage were(3.967 ±0.012)lg(CFU/g),(7.217 ±0.015) respectively. 45.92% gram negative bacteria and 54.08% gram positive bacteria were found in it,the dominant bacterial flora were composed of Staphylococcus saprophyticus(28.81%),Staphylococcus sciuri(15.38%),Psychrobacter spp.(12.09%),Pseudomonas fragi(9.02%),Pseudomonas fluorescens(8.53%) and Shewanella putrefaciens(6.39%). A few percent of Enterobacter agglomerans,Microbacterium esteraromaticum and Kocuria rhizophila were also found.The growth of Staphylococcus saprophyticus and Staphylococcus sciuri were inhibited during storage at low temperature,then the composition of bacteria flora gradually became simple,and the percent of gram negative bacteria which were suitable for low temperature increased significantly. The gram negative bacteria were 83.82%,95.86%,96.88% and 93.57% in the period of 3rd,5th,7th,9th day respectively,indicating Pseudomonas spp.(45.71%) and Shewanella putrefaciens(33.57%) were the most predominated spoilage bacteria of Pampus argenteus stored at(4+1) ℃. The species changes of Pseudomonas spp. indicated that the major species were Pseudomonas fluorescens(35.00%) and Pseudomonas fragi(10.71%).
