The effects of oxidized fish oils in the growth, survival and fatty acid composition in fish muscle and liver of juvenile red seabream, pagrus major were studied by adding different oxidized levels fish oils into the experimental diets. The results showed as follows: the influence of dietary peroxide is more efficient than that of free fatty acid on the growth and survival of red seabream juvenile. The trial juvenile weight gain(% ) and survival ratio decrease when the dietary peroxide values increases. The faaty acid composition in fish muscles and livers are related with the oxidized levels oils in diets, where as the fat content in juvenile body varies a litte. The linear regression of the juvenlie weight gain rate and POV was detected. When the juvenile was fed the diet containg oxidixed fish oils, it would related to the accumulation of peroxide lipid in its livers.