CRONE and BOND: LIFE HISTORY OF COHO SALMON 



Estimates of populations of fry in the early 

 summer for the 4 yr studied ranged from about 

 12,000 to 52,000, and apparently varied directly 

 with potential egg deposition of the brood year. 

 However, by early in the second summer of fresh- 

 water life, the three broods studied had been 

 reduced to a relatively narrow range of 3,000 to 

 4,500. Weir counts indicate 1,000 to 3,000 coho 

 salmon smolts migrate from Sashin Creek each 

 year. 



The survival of coho salmon from potential egg 

 deposition to just before the emergence of fry in 

 Sashin Creek averaged 21%; this percentage is 

 similar to survival reported for stocks from other 

 areas in the eastern Pacific. Mortality of embryos 

 and alevins was highest for the large 1963 brood, 

 which suggests that some of the mortality before 

 emergence was due to compensatory factors such 

 as selection of inferior redd sites and superimpo- 

 sition of redds. 



Highest mortality during the freshwater life of 

 coho salmon from Sashin Creek occurred in July 

 and early August of the first summer in all three 

 broods studied. The lowest mortality occurred over 

 winter. 



ACKNOWLEDGMENTS 



We thank William J. McNeil, Robert J. Ellis, and 

 William R. Heard, supervisors of the Little Port 

 Walter research station during the course of this 

 study, for their direct assistance in many forms 

 and for making manpower available for conduct- 

 ing the field work. Sincere appreciation is ex- 

 pressed to the permanent and temporary staff at 

 Little Port Walter for assistance in the field. 



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