PEARCY ET AL.: JUVENILE CHUM SALMON 





I — 

 CO 



12 



10 



I — 

 CO 



Figure 2. — Continued. 



June of 1984 and 1985 (but not 1986) (Fig. 6). The 

 large catches of juvenile chum salmon along the 

 margins of the bay at high tide, often over 500 m 

 from the low-tide channels in the upper bay, 

 show that they make extensive tidal excursions 

 over the tidal flats during daylight in early 

 spring and actively aggregate along the fringes 

 of the estuary in shallow water. 



Juvenile chum were not concentrated in the 

 main channel of lower Netarts Bay between 25 



March and 20 June 1985 when tow net hauls 

 were made. Only 38 juvenile chum salmon were 

 caught in the 31 tows (about one fish per 2,000 

 m^). Catches in night tows on 22 May were not 

 different from day tows on 21 May (Mann- 

 Whitney U test, P > 0.1). Also, the average 

 lengths of chum salmon fish caught in day and 

 night tow net collections and in beach seine col- 

 lections on 22 May were not significantly differ- 

 ent (^test, P >0.1). 



559 



