with probable special benefits, must be considered. It 

 seems that to ensure full production with adequate in- 

 surance against catastrophes, every major spawning 

 ground should be utilized every year. On the basis of 

 the smolt-escapement data, Burgner et al. (1969) 

 placed the desired escapement for the Naknek system 

 at 600,000 to 1.000,000 fish. The present study indi- 

 cates that escapements in this range probably fully 

 utilize the present combination of spawning and rear- 

 ing areas without danger of overburdening the food 

 supply. 



ACKNOWLEDGMENTS 



The original planning and development of proce- 

 dures in 1960 and 1961 were done by Charles J. Di- 

 Costanzo, Wilbur L. Hartman, and Richard R. Straty. 

 The organization and direction of field crews and de- 

 velopment of techniques through 1961 were accom- 

 plished largely by R. L. Wallace and W. R. Heard. 

 Wallace continued as field leader through 1963. The 

 extensive sampling was done by the cooperative ef- 

 forts of about 30 different seasonal aids from 1961 

 through 1964. The analysis of variance tests of results 

 of tow net sampling were done under the guidance of 

 James C. Olsen. The estimates of the numbers of fry 

 migrating during Latin-square sampling were done 

 under the guidance of Jerome J. Pella with a computer 

 program he designed. 



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52 



