tu LC 

 MS 





Ui 3 



-I (E 



*I I.I 



Z K 



-(100) 

 -(100) 



-(222) 

 -(247) 



-(126) 

 (100) 



-(73) 

 -(100) 



29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 



MIDEYE-HYPURAL PLATE LENGTH (CM ) 



Figure 16. — Length composition of pink salmon adults 

 entering Olsen Creek in 1960. Horizontal line repre- 

 sents range In length; short vertical line represents 

 mean length; black bar Includes two standard errors 

 of the mean on either side of the mean. One half of 

 each black bar plus the white bar at either end outline 

 one standard deviation on either side of the mean. 

 Standard deviation indicates dispersion; two standard 

 errors of the mean reliability. N equals number of 

 specimens In each sample. EF = East Fork, WF = West 

 Fork, IZ = Mainstream intertldal zone, LC = Little 

 Creek, and MS = Middle Slough spawning areas re- 

 spectively. Number of fish measured is shown in 

 parentheses. 



numbers or sex ratios of fish between counts 

 at the two weirs. Of all (iead pink salmon 

 removeid from the weirs, 3,221, or 37 percent, 

 were females. The apparent preponcderance of 

 males did not present a true picture of sex 

 ratios in the upstream areas, Spawned-out 

 females tended to remain in the immediate 

 vicinity of their redds until death, while 

 males were more likely to drift downstream 

 before dying. Therefore, more nnale than 

 female carcasses were observed at the weirs. 

 Except for the first sample the sex ratio 

 changed progressively from 16 percentfemales 

 July 24 to 30 to a maximum of 54 percent 

 females September 4 to 10 (fig. 18). 



Intertidal carcass counts, 1960 . --Daily 

 counts of salmon carcasses in the intertidal 



"1 3 



EF 

 WF 

 IZ 



EF 

 WF 

 IZ 



EF 

 WF 

 IZ 

 LC 

 MS 



EF 

 WF 

 IZ 

 LC 

 MS 



-(216) 

 -(68) 



(98) 

 -(63) 



-(426) 



-(214) 

 -(300) 



(150) 

 -{150) 



-(198) 



(140) 

 (329) 



(150) 

 (125) 



_!_ 



_!_ 



_1_ 



-L. 



-L. 



_1_ 



_L. 



33 35 37 39 41 43 45 47 49 51 53 55 57 

 MIOEYE-HYPURAL PLATE LENGTH (CM.) 



Figure 17. — Length composition of pink salmon adults 

 entering Olsen Creek in 1961 (for explanation see 

 fig. 16). 



Figure 18. — Percentage of female carcasses at Olsen 

 Bay weir, 1960, and in intertidal area, 1961. 



zone were made from July 13 through Septem- 

 ber 22. Of the 50,630 carcasses tabulated 

 (table 6), 28,080, or 55 percent, werefemales. 

 As in the upstream areas, a seasonal progres- 

 sion of increasing percentage of females was 



17 



