Larva - from the moment of mixed feeding to the beginning of laying scales.

Fry - the entire body is covered with scales and resembles an adult fish in appearance. The larva and the fry are also called juveniles.

Juvenile - quite mature fish from the second half of the first summer of life and in the fall.

Yearling - over-wintered juvenile fish.

Two-yearling - a fish that has lived through two summers. This name applies to fish from the second half of the second summer of life and in the fall.

Two-year-old fish - overwintered two-yearling, on the scales are distinguishable two annual rings, no growth, designated by the number 2, fish are yearlings until June.