ABSTRACT 



The threespine stickleback occurs in large numbers in Karluk Lake, Kodiak 

 Island, Alaska, an important water in studies of red salmon production. The 

 life history of the stickleback in Karluk and Bare Lakes presents many interest- 

 ing phases. It has few lateral plates, which is characteristic of the fresh- water 

 sticklebacks. It has a lifespan of about two-and-one-quarter years and in that 

 period spawns once, or twice at the most. Structurally, the stickleback is 

 hermaphroditic. It feeds on planktonic invertebrates and insect larvae. 

 A possible interrelationship between stickleback and juvenile red salmon is 

 that both consume the same kinds of food. Both species are preyed on by 

 the Arctic charr. 



