Snake River Fall 

 Chinook CWT 

 Data 



APPENDIX B— AN EXAMPLE OF HOW TO ESTIMATE 

 OCEAN AND IN-RIVER PARAMETERS FROM CWT DATA 



Number released: release = 1,467,443 

 Recoveries: 



Ocean 

 harvest 



01 = 2,105 



02 = 12,608 



03 = 2,137 



04 = 92 



In-river 

 harvest 



rl = 1,390 

 r2 = 4,716 

 r3 = 1,938 

 r4 = 121 



Hatchery 

 returns 



hi = 1,078 

 h2 = 188 

 h3 = 142 

 h4 = 4 



Assumption 

 Calculations 



Survival from release site to below Bonneville dam: surv = 0.3 



total 



LU bell 





ol + o2 + o3 + o4 + rl + r2 + r3 + r4 + hi + h2 + h3 + h4 



cnTVi 1 





total - (ol + rl + hi) 







sum2 





suml- (o2 + r2 + h2) 







sum3 





sum2 - (o3 + r3 + h3) 







adtrecv 





total / (release • surv) 



adtrecv 



= 0.06 



ocnlhav 





ol / total 



ocnlhav 



= 0.079 



ocnlsuv 





suml / total 



ocnlsuv 



= 0.828 



ocnlrvh 





rl / total 



ocnlrvh 



= 0.052 



ocnlsbe 





hi/ total 



ocnlsbe 



= 0.041 



ocn2hav 





o2 / suml 



ocn2hav 



= 0.575 



ocn2suv 





sum2 / suml 



ocn2suv 



= 0.202 



ocn2rvh 





r2 / suml 



ocn2rvh 



= 0.215 



ocn2sbe 





h2 / suml 



ocn2sbe 



= 0.009 



ocn3hav 





o3 / sum2 



ocn3hav 



= 0.482 



ocn3suv 





sum3 / sum2 



ocn3suv 



= 0.049 



ocn3rvh 





r3 / sum2 



ocn3rvh 



= 0.437 



ocn3sbe 





h3 / sum2 



ocn3sbe 



= 0.032 



ocn4hav 





o4 / sum3 



ocn4hav 



= 0.424 



ocn4rvh 





r4 / sum3 



ocn4rvh 



= 0.558 



ocn4sbe 





h4 / sum3 



ocn4sbe 



= 0.018 



26 



