30 



35 40 45 50 55 



MIDEYE-HYPURAL PLATE LENGTH (CM.) 



60 



Figure 9. —Relation of MEHP length to MEFT length of 97 female pink salmon at Olsen Creek, 1962-63. 



1963 . --In 1963, the fecundity of 52 females 

 was determined from sannples collected period- 

 ically and combined without regard to early 

 or late runs because the data collected in 

 1961 indicated no difference in the fecundity 

 of the two runs (Helle at al., 1964) and those 

 for 1962 indicated a similar relation. The 

 mean length of females sampled in 1963 was 

 43.1 cm., and the mean egg content was 

 1,929 (table 5). Although the mean lengths of 

 females were about the same in 1962 as in 

 1963, the mean number of eggs per female 

 was greater (by 100 eggs) in 1963. Females 

 collected in 1961 also had a greater mean 

 egg content (by 279 eggs) than fennales col- 

 lected in 1960, but they were, on the average, 

 also slightly longer in 1961 (Helle et al., 

 1964). 



The relation between nunnber of eggs and 

 length in 1963 for females from the early and 

 late runs combined is shown in figure 11. The 

 relation was highly significant (r = 0.634). The 

 range in lengths of females and number of 

 eggs was smaller in 1963 than in 1962, and 

 yet the correlation coefficient was higher in 

 1963. A partial explanation for the lower 

 correlation in 1962 is the presence of five 

 average to large females with considerably 

 fewer than the average number of eggs (fig. 10). 



Comparison of Right and Left Ovaries, 1963 



Several workers have found differences in 

 the average number of eggs in the right and 

 left ovaries of salmon. Rounsefell (1957) in 



15 



