TABLE 6. VARIATION WITH AGE OF FECUNDITY OF SUMMER -SPAWNING 

 HERRING, BY REGIONS (IN THOUSANDS OF EGGS). 



However, considerable variation in the number ot eggs is noticeable in herring of the same 



size. 



Table 7 gives variation in fertility with increase in linear dimensions . The coefficient of 

 the correlation between length and fertility is 0.53 + 0.08. 



The lowest fecundity (55, 300) is in the proportion 1:3.8 to the highest (294,000). 



Table 8 gives an idea of the increase in fecundity with age. The coefficient of correlation 

 between the age of the fishes and their fertility is 0.53 + 0.08. 



On the average, an increase In age of one year brings an increase in fertility of 19, 400 



eggs. 



Table 9 shows the dependence between weight and fecundity. The coefficient of correlation 

 between these two magnitudes is 0.70 + 0.07. An increase in welgjit of 25 gm. brings a fecundity 

 increase of 21,200 eggs. 



When the coefficients of correlation between fertility and size, weight, and age are com- 

 pared, the highest coefficient is observed to be that of weight and fecundity. 



The weight of the ovaries of summer -spawning herrings at the same maturity stage of the 

 gonads varies, depending on the size and wei^t of the fish. 



182 



