HENRY: FALL CHINOOK SALMON 



years (1961, 1962, 1963, and 1964) . I have dem- 

 onstrated some of the differences in ocean dis- 

 tribution, contributions to various fisheries, and 

 growth that occur between hatcheries — even 

 within hatcheries — for different brood years. 

 I also have presented a graphic population model 

 for Columbia River fall chinook salmon. This 

 model depicts all the factors affecting these 

 stocks of salmon throughout their life history. 

 Finally, within the general framework of the 

 mortality estimates developed for the 1961 brood 

 (Cleaver, 1969) and 1962 brood (Henry, 1971), 

 I have analyzed the portion of the population 

 model pertaining to the commercial fisheries to 

 determine the overall effect on total yield for 

 varying levels of ocean troll fishing mortalities 

 on the 3-, 4-, and 5-year old fish. 



RECOVERIES BY AREA 



The ocean distribution of mark recoveries and 

 contributions to the various fisheries was quite 

 different for Kalama, Spring Creek, and general 

 marked fish. Pulford (1970) listed the contri- 

 bution of Columbia river hatchery fall chinook 

 (all hatcheries combined) to the various fisheries 

 along the Pacific Coast for 1966 only. Lander 

 (1970) analyzed the distribution along the coast 

 and contribution to the various fisheries in con- 

 siderable detail for each hatchery; his data in- 

 cluded sampling through 1966 only. In Table 1 

 are listed the calculated total recoveries by geo- 

 graphical area for the 1961 through 1964 brood 

 years of special marked Kalama and Spring 

 Creek fall chinook salmon and general marked 



Table 1. — Calculated total recoveries, by age of fish and type of mark, for fall chinook salmon of the 1961-64 



broods that were marked and released at Columbia River hatcheries. 



• No sampling. 



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