"The patterns on them are just like trees 'growth rings," says Wu Chi-lun. From them he can judge the age and health of the tuna, and the temperature and climatic conditions in the waters they migrated through.
「觀察鱗片上的紋路，就像察看樹的年輪，」吳繼倫由鱗片進一步瞭解黑鮪魚年紀、健康情況、與牠們洄游過的海域水溫、氣候等情形。