Cycloid cysts are round or oval in appearance and silvery white in color. At its center is the focus or nucleus. It has two types of lines. Circulus line and annulus line. Menstrual line of Aish is called Circulus line. It is short and vague. The annual line of gravity is called annulus line. It’s big and clear. One annulus line is formed every year in a cycloid scale. The month can be determined by calculating the circle line and the year by calculating the annulus line. If there is 1 annulus line in Aish, 1 year is calculated, if there are 2, 2 years. Thus the age of the fish is determined by counting the annulus and circulus lines. Ruhi fish live for a maximum of 10 years. Therefore, there can be maximum 10 annulus lines in its scales. Dr. Siddiq Publications