PEARCY and FISHER: MIGRATIONS OF COHO SALMON 



I I I I Ku I I I I 1 IV q 



-CAPE FLATTERY 



SEPT JUNEV MAY 

 1982 



-rCAPE FLATTERY 



Figure 5. — North-south movements of marked juvenile coho 

 salmon captured in purse seines, May, June, and September 

 1982. The width of the lines are approximately proportional to 

 the number of fish. Numbers at end of arrows indicate number 

 offish captured. Arrows without numbers and thin lines repre- 

 sent single fish. Inshore-offshore movements are not shown. 

 Dashed lines indicate latitudinal extent of sampling. 



JUNE 

 1983 



Figure 6. — North-south movements of marked juvenile coho 

 salmon captured in purse seines, May, June, and September 

 1983. The width of the lines are approximately proportional to 

 the number of fish. Numbers at end of eirrows indicate number 

 offish captured. Arrows without numbers and thin lines repre- 

 sent single fish. Inshore-offshore movements are not shown. 

 Dashed lines indicate latitudinal extent of sampling. 



nia during July 1984 are notable (Fig. 7). They 

 were captured in our only cruise into California 

 waters and represent the only recoveries of 

 marked juvenile coho salmon originating from 

 hatcheries south of Cape Blanco in all six years of 

 sampling. Although ocean sampling was limited 

 south of Coos Bay, if juvenile coho salmon from 

 southern Oregon and northern California hatch- 

 eries had migrated north of Coos Bay, we 



would expect them to be represented in our 

 catches. The fact that they were not caught in this 

 northern region, but two were caught after swim- 

 ming to the south, suggests that juvenile coho 

 salmon originating in streams south of Cape 

 Blanco may migrate south, possibly occupying 

 the region of intense coastal upwelling off north- 

 ern California during their first summer in the 

 ocean. The catch of over 70% of the adult coho 



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