FISHERY BULLETIN: VOL. 70, NO. 2 



Figure 13. — Calculated total yield diagrams (in kilograms per 1,000 recruits) for the 1961 brood Spring Creek 

 hatchery fall chinook salmon with constant natural mortality (M = 0.24), varying ocean troll fishing mortality 

 rates (F3, F4, and F5), and the proportion spawning and river fishing intensity remaining constant. Yields are 

 shown by 100-kilogram plane intervals. 



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