FISHERY BULLETIN: VOL. 71, NO. 3 



16 — 

 14 - 

 12 - 

 10 - 

 8 - 



30 - 



es 



20 

 15 

 10 - 

 5 

 O 



I I I 1 1 1 r 



Size frequency, Shell Beach, Age class 0-3 



40r— 



35 - 



30- 



25 - 



20- 

 15 - 

 10 - 

 5 - 



IZZl 



o 



I 



2 



Size frequency. Shell Beach, Age doss 7-9 



_□. 



180 200 



kJljfll 



1 r ll r- I I  



220 240 26 '■ .^'■ t JOO 320 340 



Shell height 



AGE 



tin 4 



1ZZ3 5 



I \ 7 



^M 8 



g 



1 1 1 1 1 1 



Size frequency, Shell Beach, Age class 10-13 



Ffa J 



EZ3 10 



\ I 12 



^H 13 



rfl^ n 



280 300 320 340 360 360 4O.0 

 Shell height 



Figure 5. — Size distribution of annular age classes of Protothacastaminea from Shell Beach, Galena Bay. 



Growth 



The littleneck clams in Galena Bay (Table 2) 

 at a given age are smaller than those collected 

 by Fraser and Smith (1928) in British Columbia 

 (Table 3). The annual increase in shell length 



for the various size classes in Galena Bay is 

 typically 2 to 5 mm. As a result, 8 to 9 yr 

 are needed for P. staminea to reach a length 

 of 30 mm, the minimum size generally harvested 

 in the sport fishery in Prince William Sound 

 (J. Van Hyning, Wildlife Department, Univer- 



670 



