ARMETTA and STEVENS: BIOLOGY OF THE HAIR CRAB 



Alaska 

 Peninsula 



Unimak I. 



PACIFIC OCEAN 



m° N 



50° 



40" 



120- E 



150" 



180° W 



150° 



Figure 2. — Known world distribution of Ertmacrus isenbeckii. Areas of high and low density are indicated by crosshatching and 

 parallel lines, respectively. Question marks indicate areas where hair crab are believed to occur but are not well documented. 



120 

 110 

 100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 



10 

 



C 14 



C7 



C9 



J 



C 10 



C 11 



C 12 Male 



C 11 



c 



Female breedincj cycle 



Molt and breed 



111 Spawn 



Eggs 

 hatch 



C 13 



Female 



Molt 

 and 

 breed 



Eggs 



Spawn hatch 



.Ovigerous»^_ 



C 12 



( 



I 



.J 



Settle 



Hatch T 



V ^ ^ _' ' '_ " ' •* — Ovigerous 



 • ^ S , ~f-- -r— ^- , 



1 1 1 1 I 1 I I I I I 1 1 I 1 I n I I I I 1 1 I I I I I I 1 1 I 1 I I I I I I I I I 1 1 II 1 1 I II ] I I I! I 1 1 1 I I I I I I 1 1 I 1 1 1 1 I 



Aprii Apr^, April April April April April April Apr-' 



12 3 4 5 6 7 



Age (years) 



I'll 



April 

 8 



525 



