RELATION BETWEEN EGG SIZE AND BODY SIZE AND AGE OF FEMALES IN BROOK TROUT (Salvelinus fontinalis Mitchill)

Abstract

Maximum and minimum diameter of swollen eggs, and size of females (total length, and body mass) were measured. The eggs were obtained from 355 females in course of an artificially induced spawning . Ten eggs from each female were measured. The results indicate that: 1 – brook trout egg size is not related to the size of females but to their age, 2 – measuring one diameter (maximum or minimum) only is sufficient to estimate the egg size, 3 – brook trout eggs are ellipsoidal, with slight difference between maximum and minimum diameter, 4 – the eggs become more globular as females size increases.