FISHERY BULLETIN: VOL. 74. NO. 4 



weir ranged from to 567 (Table 2). The weir 

 counts are not accurate measures of the number of 

 coho salmon in the escapements, however, because 

 the weir was maintained primarily to count pink 

 salmon and the panels were usually removed at the 

 end of the pink salmon run near the end of 

 September. Moreover, coho salmon can jump over 

 the weir panels and many did so each year and 

 were therefore not counted. 



Because of the problems with weir counts, an 

 effort was made to obtain accurate estimates of 

 the coho salmon escapements in 1963-65 and 1967 

 on the basis of repeated observations of the 

 number and distribution of salmon in the three 

 study areas (Table 3). Adults on the spawning 

 riffles were counted by periodic visual censuses, 

 and the counts were recorded separately for each 

 area. In 1963 and 1964, salmon were counted only 



when water conditions were most favorable for 

 observing fish; spawners were not recorded sepa- 

 rately by sex. In 1965 and 1967, visual surveys were 

 conducted daily, except for 6 days in 1965 when the 

 water was too high to make observations; males 

 and females were recorded separately. Funny 

 Creek was included in the surveys in 1965 and 1967. 

 Spawners on the riffle areas were usually count- 

 ed between 1000 and 1400 h, when light conditions 

 were most favorable for observing fish. The ob- 

 server (wearing polarizing glasses to reduce glare 

 at the water surface) began counting at the 

 upstream end of the spawning area and continued 

 downstream. In 1965 and 1967, the observer 

 recorded the location of individual females with 

 reference to section markers spaced at 30.5-m 

 intervals and a baseline running longitudinally 

 between markers in the stream. The number of 



Table 2.-Number of adult coho salmon counted into Sashin Creek at the weir by 2-wk intervals, 



1934-69.' 



'Dally counts for 1934-63 from Olson and McNeil (1967). 

 2Welr discontinued during this period. 



900 



