Table 8. — Potential egg deposition in August and September 1966, resulting number of live alevins 

 in March 1967, and fresh-water survival of pink salmon in four areas of Sashin Creek 



Area 



Potential egg deposition 



Total 



Density per 

 square meter 



Live alevins 



Total 



Density per 

 square meter 



Number 



Number 



Number 



Number 



Upper section 



Middle section 



Lower section 



Remainder of stream. 

 Total 



Survival 



Percent 



No live alevins were found in the Upper section in March, and the "remainder" of the stream 

 was not sampled. The number of live alevins here is based on potential egg deposition and an 

 assumed survival of 11.7 percent. 



2 Average (weighted by number of females) of Middle and Lower sections. 



Table 9 — Potential egg deposition, number of live and dead eggs or alevins, and calculated survival of 1966 brood 

 year pink salmon in three areas of Sashin Creek. One hundred 0.1-m. 2 samples were taken in each section on each date 



Section 



Potential egg deposi- 

 tion per square meter 



Mean 



90-percent 



confidence 



limits of 



mean 



Date 



Actual eggs and alevins per square meter 



Combined live 

 and dead 



Mean 



90-percent 



confidence 



limits of 



mean 



Ratio of live to 



combined live 



and dead 



Mean 



90-percent 



confidence 



limits of 



mean 



Live 



Mean 



90-percent 



confidence 



limits of 



mean 



Calculated 

 survival 



Sept. 25 



to 

 Mar. 10 



Total 

 fresh- 

 water 



Upper. . . . 



Middle. 



Lower. . . . 



Number Number 



80 +5 



567 +37 



570 +37 



Number Number Percent Percent Number Number Percent Percent 

 98 +5 114 +108 — 142.5 



"Sept. 25 116 +109 



+28 



+1 



+29 



+45 



20.2 



53.3 



0.0 

 42.9 



8.6 

 26.5 



14.0 



of the eggs hatched, and the alevins had a 

 higher mortality in the Middle section; (2) the 

 portion of eggs hatching was the same in the 

 two sections, but the eggs and alevins were 

 removed from the gravel (by scouring or 

 predators) at a higher rate in the Middle 

 than in the Lower section, possibly because 



of differences in the size of the substrate 

 (table 2); or (3) the difference in calculated 

 survival is due to sampling error. 



The results of the sampling in September and 

 March were compared for the Middle and 

 Lower sections by the chi-square test to 

 determine if the changes in portion of samples 



10 



