37 



Table 6. NuiTiers of fall Chinook chac were progeny of fish sca-vnmg m the 

 wild chac passed above Lower Granice Dam in cheir accempc Co recurn 

 CO Che upstream spawning grounds adjusted to account for the Lyons 

 Ferry brood stock "mining" program at downscream dams added to the 

 number of fish chac were progeny of fish spawned at hatcheries 

 which were prevented from migrating past Lower Granite Dam and 

 returning co che upstream spawning grounds added co che number of 

 fish Chac were progeny of fish spawned ac haccheries which were 

 allowed to migrate past Lower Granice Dam in their atcempc Co 

 recurn Che upsCream spawning grounds.' 



Progeny of Hatchery Spawned Fish 



Progeny of Fish Lower Fish Allowed Past 



Spawned in the Wild and Granice Lower Granite Dam 



Allowed Past Lower Granice Dam Dam Snake Columbia 



Nacural Adjusced Trap River River 



Year Escapemenc AdiusCment EscimaCe Removals SCrays Strays 



1,000 



+2872 757 



+294 894 ' 



+314 954 



+295 795 



+221 671 



+384 724 



+310 1,030 



+223 651 112 



+207 531 310 6 



+180 618 241 12 



+36 485 325 10 



+91 344 644 54 



+144 512 201 58 



+97 392 206 205 



+35 113 50 174 83 



318 40 202 70 



549 187 100 19 



742 >^18 43 167 



441 >32 162 max 162 max 



' All daca included in Chis cable refers Co adulc fish. 



2 The brood stock "mining" in 1976 Cook place aC Liccle Goose Dam rather Chan 

 Ice Harbor Dam. 



Table 7. Escapeme.TC and age composicicn daca used to estimate exci."cf.c.-. 

 probabilicies for Snake River fall Chinook salmon. 



Nacural Age Composition of Escapemenc 



Year Escapemenc Three Year Olds Four Year Olds Five Year Olds 



1975 - 1982 age composicion escimaces noc available 



11.4% 84.6% 4.0% 



8.6% 91.0% 0.3 



9.1% 86.3% 4.6 



55.9% 36.1% 8.0 



8.7% 89.7% 1.6 



S.4% 67.9% 22.6 



7.8% 80.7% 11.5 



12.8%- 75.6% 11.5 



29.9% 56.0% 14.2 



16.8% 71.6% 11.7 



6.7% 85.1% 8.2 



1994 age composicion escimaces not av ailable 



Data sources: Dygerc (1994) for escapements through 1993, Mike Matylewich 



(personal communication) for escapemenc in 1994, Roler (1994) for age 

 composicion escimaces. 



