Number of the eggs in the ovaries and eggs spawned and their diameter and per cent eyed eggs were examined in adult femlaes of various weights and ages to obtain basic information for the systematic fry production of the carp, Cyprinus carpio. The number of the eggs spawned (SE) and the eggs in the ovaries (OE) increase proportionally with the body weight (W) of adult females as follows: SE=119.4W-0.643, OE=218.9W-34.380. However, the number of the eggs spawned per unit body weight was relatively constant. Namely, adbout 119 eggs per unit body weight and about 54% of the total number of the eggs in the ovaries were spawned at a time. The mean diameter of ripe unfertilized eggs of the 2-year-age group was smaller than of the 4-7 and loder age groups, but no significant differences were found in mean diameter among other age groups. There were no significant differences in the per cent eyed eggs among all age groups. The composition of the egg size in the ovaries demonstated characteristic features of the type of asynchronism, that is, the ovary in the full stage contains eggs of various sizes.