Table 3. Life table for summer/fall chinook salmon in mid-Columbia River tributaries with migration estimates from three sources.
| Item |
Wenatchee River drainage |
Entiat River drainage |
Methow River drainage |
| Average run size (1967-87) |
68,600 |
570 |
19,350 |
| Spawning area (ha) |
488 |
22 |
245 |
| Rearing area (ha) |
same |
same |
same |
| Number eggs deposited |
20,300,000 |
169,000 |
5,700,000 |
| Number migrantsa | |||
| (1 g yield/m2; 5 g mean wt.) |
976,500 |
43,700 |
490,700 |
| Egg-to-migrant survival |
4.8% |
25.8% |
8.5% |
| Migrant-to-adult survival |
7.0% |
1.3% |
3.9% |
| Number migrantsb | |||
| (19.9 fish/100 m2) |
971,000 |
43,500 |
488,200 |
| Egg-to-migrant survival |
4.8% |
25.9% |
8.5% |
| Migrant-to-adult survival |
7.1% |
1.3% |
3.9% |
| Number migrantsc | |||
| (35.2 fish/100 m2) |
1,718,563 |
76,951 |
863,556 |
| Egg-to-migrant survival |
8.5% |
45.5% |
15.2% |
| Migrant-to-adult survival |
4.0% |
0.7% |
2.2% |
| Summary of above | |||
| Number migrants (000) |
482.4-1,718.6 |
21.6-77.0 |
242.4-863.6 |
| Egg-to-migrant survival |
4.8-8.5% |
25.9-45.5% |
8.5- 15.2% |
| Migrant-to-adult survival |
4.0-7.1% |
0.7- 2.6% |
2.2- 8.0% |
a Observed from experimental section of Icicle Creek, 1986-89.
b Estimated from Table 1, density according to HQI rating of excellent.
c Wenatchee R. June densities minus July densities (Hillman and Chapman 1989).