Table 13. — Estimated catch of 1964-brood special marked fall chinook 

 contribution from Bonneville and Little White Salmon National Fish 

 type, 1966-69. 



FISHERY BULLETIN: VOL. 76, NO. 1 



salmon and potential 

 hatcheries by fishery 



Estimated catch of marked flsti by year 



Hatchery and fishery type 



1966 



1967 



1968 



1969 



Bonneville Hatchery: 



Marine sport 99 70 95 



f^^arlne commercial 62 230 172 



Columbia River sport 



Columbia River commercial 17 



Columbia River Indian' 4 



Total 165 300 284 



Little White Salmon Hatchery: 



t^arlne sport 40 37 



Marine commercial 4 84 125 



Columbia River sport 



Columbia River commerical 5 8 



Columbia River Indian' 



Total 4 129 170 



Total 

 catch 



Potential 



contribution 



(in thousands) 



'Setnet and dip net fisheries. 



Southeastern Aloska 



COMMERCIAL 



British Columbia 



SPORT 



GILLNET 



INDIAN 



Southeastern AtasKo 



COMMERCIAL 



British Columbia 



COMM ERC I AL 



Washin g ton 



SPORT 

 COMMERCIAL 



Ore gon 



SPORT 

 COMMERCIAL 



Colifornio 



SPORT 

 COMMERCIAL 



Columbio River 



SPORT 



GILLNET 



INDIAN 



BONNEVILLE HATCHERY 



Zl 29% 



0% 



n 3% 



% 

 \ 



10 

 PERCENTAGE 



60 

 OF CATCH 



LITTLE WHITE SALMON HATCHERY 



H 11% 



1 25% 

 2 2 % 



0% 

 P 3% 



0% 



n 1 



0% 



-L. 



10 60 



PERCENTAGE OF CATCH 



FIGURE 8.— Percentage of catch of 1964-brood fall chinook salm- 

 on from Bonneville and Little White Salmon Hatcheries taken 

 by area and fishery, 1966-69. 



ocean fisheries, the 3-yr-old exceeded the 4-yr-old 

 catch. However, in the river the 4-yr-old catch was 

 larger than the 3-yr-old. The Columbia River fall 

 chinook salmon sport fishery was small and few 

 marked fish were observed. 



The potential contribution for the four broods 

 combined was 1,433,300 fall chinook salmon. The 



198 



contribution ranged from a low of 165,200 fish for 

 the 1962 brood to a high of 602,200 for the 1963 

 brood. The contribution figures in Table 14 include 

 fish with common and special marks as well as 

 unmarked fish from the 13 study facilities. The 

 average catch to release ratio was 6.7 fish per 

 1,000 released, with ratios of 6.7, 3.1, 10.0, and 6.5 

 for the 1961-64 broods respectively. The average 

 catch per pound released was 1.2 fish with ratios 

 by brood of 1.4, 0.6, 1.7, and 0.9 fish per pound 

 released. The catch was distributed primarily 

 among the British Columbia commercial (34%), 

 the Washington marine sport and commercial 

 (38%), and the Columbia River gillnet (19%) 

 fisheries (Figure 9). 



CATCH TO ESCAPEMENT 

 AND SURVIVAL 



Returns to Columbia River hatcheries, both 

 study and nonstudy, and to streams adjacent to 

 these hatcheries were examined for marked 

 chinook salmon (see Enumeration of Returns). 



Mark return data were used to estimate catch to 

 escapement ratios and total survival percentages 

 for each special mark hatchery and all study 

 hatcheries combined (Table 15). Only marked 

 catches and escapements were used to develop the 

 estimates to eliminate possible inflation of es- 

 capement values due to unmarked wild fish in 

 hatchery returns. Survival estimates were calcu- 

 lated by dividing the potential marked catches 

 and escapements by the marked releases. Poten- 

 tial marked catches and escapements are those 

 that would be expected if marking did not cause 

 post release mortalities. Potential marks were es- 



