880 



Fishery Bulletin 101(4) 



90 1 



~ 80 



70 



65 



60 



200-400 400-600 600-800 800-1.000 



Depth range (m) 



1,000-1.200 



1.200-1,400 



Figure 5 



Mean carapace width of the males (M) and females (F) of P formosa and P. spinosissima 

 found at different depth distributions. 



carapace length reported by Otto and Macintosh (1996) for 

 P. spinosissima from Shag Rocks and South Georgia. 



Unfortunately, owing to limited sampling of male crabs 

 around South Georgia, estimates of male sexual maturity 

 were only available for Shag Rocks. Too few samples off! 

 anamerae were available for determination of the onset 

 of female or male maturity in either area. Male size at 

 maturity (Sm^g) was determined at a carapace length of 

 67.3 mm (SD=2.3 mm derived from bootstrap resampling 

 with replacement) for P. spinosissima and at 64.0 mm (SD= 

 3.6 mm) for P. formosa (Fig. 8). 



Crab survival rate 



Approximately 5000 crabs were examined for carapace 

 damage on the cruises in 2001. The results (Table 6) indi- 

 cated that the level of visible damage to these crabs prior 

 to discarding was very low (2% of crabs of all species). The 

 vitality of these crabs was also assessed (according to the 

 index in Table 1). Most crabs were lively on arrival on deck 

 and prior to discard (Table 6). Differences were, however, 

 noted in both carapace condition and the vitality of crabs 

 between the two fishing vessels. Pairwise x^ comparisons 



