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POTENTIAL EGG DEPOSITION 



■LIVE EGGS IN GRAVEL 



FRY- 



AUG. 'SEPT. OCT. ' NOV. ' DEC. ' JAN. ' FEB." MAR. ' APR 



Figure 2. — Fresh-water survival from potential egg deposition to fry for the 1964 brood year 



adult pink salmon In Sashln Creek. 



Table 5. — Density of 196^ brood year pink salmon in 

 study sections from spawning to fry emergence, 

 Sashin Creek 



Section 



Estimated 



potential egg 



deposition 



per square 



meter 



Estimated sur- 

 viving embryos 



per square 

 meter at end 



of spawning 



Estimated sur- 

 viving alevins 



per square 

 meter at begin- 

 ning of fry 

 emergence 



Number 



Number 



Number 



stream 



l&i 



91 



23 



•'■ The increase from to 1 is consistent with antici- 

 pated errors in sampling. 



RETURN OF SPAWNERS 



About 6,000 adult pink salmon returned to 

 Sashin Creek to spawn in the summer of 1966 

 (Ellis, in press) from about 1,900 transplanted 



and 300 stray adults in the summer of 1964. 

 This number was about 2 percent of the 3 1 0,000 

 fry that migrated to sea in spring 1965. The 

 estimates of ocean survival based on the num- 

 ber of adults returning to the weir are useful, 

 although they are minimum estimates because 

 the intensity of the commercial fishery on 

 Sashin Creek pink salmon is unknown. Before 

 1966 the number of spawners returning to 

 Sashin Creek averaged 3 percent (range 0.3 to 

 18 percent) of the number of fry migrating to 

 sea (calculated from data presented by McNeil 

 (1968) for 18 observations from 1940 to 1965). 

 The migration of adults to Sashin Creek in 

 1966 was earlier than usual. The first adults 

 entered the creek on August 23, 1966, and 50 

 percent of the total number had entered by Au- 

 gust 31. In the past, pink salmon have entered 

 Sashin Creek from early August to late Septem- 

 ber. Twenty- eight years of observation show 

 that 50 percent of the total number of spawners 

 may be in the creek as early as August 13 or 

 as late as September 18 (McNeil, 1968). The 

 average date has been September 11 for even- 

 year lines and September 2 for odd-year lines. 



