The relation of the number of ripe ovarian eggs of the pond smelt (N) to the total length of body (L) and to the body weight (W) may be expressed by the formula
N=aLb and N=a'Wb'
respectively, where a, b, a', b' are constants specific to the kind of fish. The value of these constants calculated in the present species are
a= 58.83×10-5, b=3.52
and a'=1.000, b'= 0.967.
