2000 Volume 62 Issue 5 Pages 59-69
The changes in the radius of Cole-Cole circular arc calculated from the high frequency range of 10kHz-1MHz, the resistance ratio and the resistance difference of 10kHz and 1MHz were examined as practical freshness indices during ice storage of red sea bream, carp and yellowtail. These indices were measured using needle electrodes and contact electrodes to obtain the correlation between the freshness indices and ice storage time. As the results, the differences in values of the freshness indices among individuals, fish species and measuring positions were observed: both measurements of fillets from bone side by contact electrodes and from skin side by needle electrodes were effective. The correlation coefficients between the freshness indices and ice storage time were high, and the changes of indices within several hours were detected for yellowtail. In the case of measurement from skin side by contact electrodes, only small variations of the indices were observed due to the high resistance of skin.
