87 



Terminal Area Run Size and Escapement 

 Ooals 



and Late-timed 



Combined Normal- 

 Snawnera 



Although the terminal catch hae been 



tending to increase, until recently 



wild escapement often fell short of 



the goal (Table 5). The wile 



escapement goal has been met in all 



four of the past years but was only 



met in eight of the past seventeen 



years; this despite increasing 



terminal runs over those years 



(Figure 10). Local under escapement 



is common even when the overall goal 



is met, although not consistent in 



any one sub-basin (Stone, WDT, pers. coram. ) . Wild underescapement may result 



from low survival of wild coho, sometimes combined with heavy harvest. 



CHEHJU.IS BASIN COHO RUN SIZE 



ItfO !••« 



Figure 10. (Tiriiilii Ejild cobo ealmoo terminal area run aize (WDF 

 uopubuahed data). 



Late-timed Spawnera 



Late-spawning wild coho have been documented in Bingham Creek, a tributary of 

 the East Fork Satsop (Dave Seiler, WDF, pers. comm.), the upper Wynoochee 

 River (USAGE, Seattle District, unpub. records), and the Wishkah River (Terry 

 Balzell, LLTK, pers. comm.) and may use other streams as well (Seiler, WDF, 

 pers. comm.). Late-spawning coho have always been far fewer than normal-timed 

 coho, but the late run has been particularly small in the last several years, 

 perhaps due to unintentionally heavy hatchery brood stocking or poor survival 

 of late-timed hatchery coho after release (Seiler, WDF, pers. comm.). 



Marine Interception 



The British Columbia fisheries, 

 mostly off the west coast of 

 Vancouver Island, accounted for an 

 average 82.7% of the marine catch of 

 Chehalis coho salmon throughout the 

 last 15 years (Figure II). Oregon 

 fishers harvested an average of 7.3%. 

 The Washington share varied from 3.9 

 to 15.6%. 



Juvenile Production 



The number of natural coho amolts 



COHO KUUXI CXTCH PA.TTXRH 



£ ••% 



I *- 



II 



2 : 



P 

 1 



I 



Hi 







i 





m 



w 



iii 



i 



JU 



131* aevc u?a ataa ittt u» i»tt uti 



Figure 11. Chchalsa Baain marine cobo catch Attribution (PSMFC 

 and WDF unpublufaod data). 



produced annually in the entire Chehalis Basin above the town of 



30 



