At the pecking stage, the fry are 3 to 6 mm in size. After wintering it is called a yearling, and by the end of the year it is called a two-year-old. After surviving another winter season, it becomes a three-year-old.

Two-years-old is the term meaning that the fish is living its second summer, i.e., it is a overwintered annual in its second year of life. It is denoted by 1+, which means there is one annual ring on the scale and growth (+) of the second year. This name applies to fish from the second half of the second summer of life and into the fall. Two yearlings also belong to the first age group.