SCALE IN KILOMETERS 



Columbia River 



y ASTORIA 



RELEASE SITE, 



ASTORIA 



YACHT CLUB 



NEW HIGHWAY 

 101 BRIDGE 



FIGURE 1.— Columbia River study area showing lo- 

 cation of Willard and Little White Salmon National 

 Fish Hatcheries and detailed features of the Youngs 

 Bay region. 



KLASKANINE 



FISH 



HATCHERY 



Returns of coho salmon to hatcheries near 

 the two release sites were examined for marked 

 fish to assess the effect of release site on hom- 

 ing. Hatchery personnel examined all returns to 

 Little White Salmon National Fish Hatchery for 

 marked coho salmon in the fall of 1973 and 1974. 

 A series of waterfalls blocks access to Willard 

 Hatchery; therefore, coho salmon released from 

 Willard return to Little White Salmon Hatchery. 

 In addition, State personnel examined all returns 

 at the following hatcheries for marked coho 

 salmon: Klaskanine Salmon Hatchery on the 

 Klaskanine River (a tributary of Youngs Bay); 

 Big Creek Salmon Hatchery on Big Creek near 



Knappa, Oreg.; the Elokomin Salmon Hatchery 

 on the Elochoman River near Cathlamet, Wash.; 

 and the Grays River Salmon Hatchery on the 

 Grays River near Grays River, Wash. (Fig. 1). 



Results 



Homing 



We compared 1) the location of catch within 

 the Columbia River and 2) return sites of the two 

 marked groups to determine the accuracy of 

 homing to the release site. 



The fish in this study returned almost exclu- 



144 



