Robichaud et al.: Selection of Chionoecetes opilio and Hyas spp. by Gadus morhua and Raja radiata 



677 



be identified from snow crab found in skate stomachs 

 (Fig. 10). 



The size-frequency distributions of Hyas araneus and 

 H. coarctatus found in cod stomachs were similar (Fig. 

 11). However, although molt groups could be deter- 

 mined visually, detailed modal analysis of the distribu- 

 tions was not possible because of the small number of 

 individuals comprising each mode (Macdonald and 

 Pitcher 1979). The maximum size of Hyas araneus and 

 H. coarctatus found in cod stomachs was 42 and 46 mm 

 CW, respectively. 



Skate 



~i ' i ' r 



i l- i ' 1 ' i 



<u 40 

 o 



E 



Z 20 



10 20 30 40 50 60 70 80 90 100 110 

 Carapace Width (mm) 



Figure 10 



Size-frequency histograms of C. opilio found in the stomach 

 contents of all cod and skate sampled in 1981 and 1982. 



40 



30 



20 



^ 10 



o 30 



H. araneus 



N = 272 



20 



10 



"I I 



H. coarctatus 



N=299 



V 



PP Pfe^-pu 



"I 



10 20 30 40 50 



Carapace Width (mm) 



Figure 1 1 



Size-frequency histograms of toad crab found in the 

 stomach contents of all cod sampled in 1981 and 1982. 



