Measurements of the total length of salmon sexed in the Trtnity 

 Center area Indicate that females there are larger than those spawning 

 near Lewis ton (Table 12, Figure 7)» The mode or greatest number of 

 females of the same length in the Lewis ton sajnple was 29 inches and in 

 the Trinity Center sample it was 31 inches. In the TVinity Center area 

 54 percent of the females measured 31 inches or longer, and near Lewis ton 

 only 16 peroent were In the same category* The mean total length of 

 females at Trinity Center was 30*3 inches and that of females at Lewiston 

 was 28.9 inches* "ffne difference between these means is 1*4 inches and 

 tests for validity of this difference show a high degree of significance 

 (2*3 times the square root of the sum of the squares of the standard 

 errors of the means). The difference in the sise of the male fish of 

 the two areas is not significant* Males averaged 24*0 inches in length 

 at Tlrinity Center and 23*3 inches at Lewiston. Near Lewiston 59 percent 

 of the males were grilse, as ctwipared with 41 percent at Trinity Center* 



Eggs contained in the ovaries of 70 female salmon were counted 

 during the course of the investigations (Table 13). Individual counts 

 ranged from 2,341 to 4,764 and average 3,466* The correlation between 

 egg content eind weight of females is not very well marked although the 

 two characteristics are oertainly closely related* Snyder (1931, p* 13) 

 reports counts frcxn salmon taken in the Klamath River that compare 

 favorably with these figures. He derived a mean of 3,760 eggs between 

 extremes of 1,718 and 4,977* These ooimts closely appi^ximate the average 

 number of eg^s in female king salmon from the Rogue River, which is believed 

 to be about 3,000, and stands In sharp contrast to the 7,000 plus eggs 

 carried by salmon in the Sacramento River* Part of this difference cam 

 be attributed to differences in average weights between females of the 

 two races* 



The weights of king salmon in the vicinity of Lewiston were de- 

 termined from samples collected at the oovinting weir and along the 

 river at various points* Weights of salmon in the spawning area are 

 of little value in considering the problems of yield to commercial or 

 sports fisheries, but they are of biological interest* The average 

 weight of 70 females collected furing the 1944 and 1946 migrations was 

 13 pounds, while that of 61 males was 9*6 pounds* Average weights of 

 salmon caught by ooraiiereial natters at t he mouth of Klaaath River as 

 determined by Snyder (1931) were t 15*3 pounds in 1917 and 16*6 pounds 

 in 1919* These weights did not include many of the grilse entering the 

 river and may be somewhat high as averages for the entire run* If this 

 discrepancy is disregarded, and if the Trinity River races are similar 

 to all others in the Klamath drainage, then the effort expended in 

 migrations upstream to Lewiston requires between 4*6 and 5.r pounds of 

 body weight* 



36 



