[en] The amount of hydrocarbons (HC) and 2-alkylcyclobutanones (RCB), which are both radiolytic compounds of lipid from irradiated rainbow trout, were measured by continuous analysis method. The results are discussed in relation to the possibility of detecting irradiated rainbow trout. Various hydrocarbons were formed in irradiated rainbow trout and saturated hydrocarbons were detected in unirradiated sample. Therefore, the amount of hydrocarbons is not suitable for the marker of irradiation. In addition, it is found that ratio of radiation-induced C_n-1:0 and C_n-2:1 does not result in correct identification of irradiated rainbow trout. 1,7-Hexadecadiene was detected only in irradiated sample, and amount formed was in direct proportion to doses between 1-11 kGy. 2-Dodecylcyclobutanone and 2-tetradecylcyclobutanone were formed at half the amount of C_n-2:1 which were formed from the same fatty acids, and the amount of them were in direct proportion to doses. These results indicate that it is possible to identify irradiated rainbow trout by measuring the amount of C_n-2:1 and RCB using continuous analysis method. In addition, by measuring electron spin resonance (ESR) of high-density bone after additive re-irradiation, dose irradiated was able to be estimated. (author)