20 



SALMON GEAR LIMITATION 



250 



18 28 Nov.7 17 27 Dec 7 17 27 



FIG. 9. Entry patterns showing the numbers of fish entering Area 1 

 each day during the season for sockeye, pink, silver, and 

 chum salmon. 



two areas provides an estimate of the travel time between the areas. 

 Staff biologists of the Washington State Department of Fisheries 

 rendered valuable assistance in determining the timing patterns. 

 Fortunately, we were able to draw upon their experience and knowl- 

 edge to help estimate the values of movement parameters in areas 

 where tagging data were deficient or catch data difficult to interpret. 



Route of Migration 



The general migratory routes used in the computer simulation 

 of the net fisheries are shown in Figs. 10, 11, 12 and 13. Fishing 

 Areas 1 and 2 include both Canadian and United States waters. The 

 per cent of the run available to each of the national fleets was esti- 

 mated from available catch and tagging data. For example, in area 

 1, 94 per cent of the sockeye population is available to the Canadian 

 fleet and 6 per cent available to the United States fleet. Regardless 

 of the amount of iniensity exerted by the United States fleec m this 

 area, 94 per cent c»f the sockeye would not be afl'ected. 



The exploitaiiun of the runs in each area is determmcu by the 

 proportion of the runs that enter the area, the length of time fish 

 spend in the area, and the amount of gear that fishes in the area. 

 For example, the sockeye runs are totally unaffected by the amount 



