GROOT and QUINN: HOMING MIGRATION OF SOCKEYE SALMON 



fish in nearshore waters. The troll catches and 

 boat efforts are recorded on a weekly basis for the 

 different statistical areas by the Department of 

 Fisheries and Oceans of Canada (F. Wong-^). The 

 west coast sockeye salmon catches generally re- 

 flect the annual variability in the total Fraser 



3F. Wong, Pacific Biological Station, Nanaimo, B.C. V9R 

 5K6, Canada, pers. commun. 1984. 



River run (Henry 1961); therefore, most sockeye 

 salmon captured along the west coast are consid- 

 ered to be returning to this river. Small propor- 

 tions of the catch are of Barkley Sound (Vancou- 

 ver Island) and Lake Washington (USA) origin. 

 In 1979 and 1982 peak catches of sockeye 

 salmon occurred near the middle of Vancouver 

 Island in areas 24-26 (Fig. 4). The relatively low 

 diversion rates (27 and 22% respectively during 



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 1981 



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NORTH SOUTH 



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 1979 0- 



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1982 



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NORTH SOUTH 



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NORTH SOUTH 



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1980 



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27 26 25 24 23 



FISHING AREAS 



27 



26 25 24 

 FISHING AREAS 



23 21 



Figure 4. — Vertical bar graphs illustrate the proportions of the total troll catch of sockeye salmon off the west coast of Vancouver 

 Island caught in different statistical areas (see map insert) for the years 1979-83. Horizontal bars indicate the proportions of 

 sockeye salmon migrating to the Fraser River via the northern and southern routes. 



459 



