672 



Fishery Bulletin 89(4), 1991 



Sample 9 



Danish Seine 



- 27Skate 



09/26/82 



(66-90m) 



6 

 5 - 



Sample 1 



Concord Trawl 



1 Skate 



04/2 1 /B 1 



< 10 1m) 



6 i- 

 5 



Sample 11 



Danish Seine 

 28 Skate 

 09/27/82 

 - (113-1 19m) 



Sample 2 



Danish Seine 

 33 Skate 

 05/05/81 

 5 ( 1 30- 14 1m) 



Sample 15 



Danish Seine 



09/29/82 



2 - 



(79m) 



Figure 3 



Percentage by weight of prey categories against total weight 

 of stomach contents from cod sampled in April/May 1981 and 

 May 1982. Dark bar represents the percentage by weight of 

 toad crabs (Hyas araneus, H. coarctatus, unidentified Hyas); 

 depth range given in meters. 



number of toad crab per stomach was 1.63, compared 

 with 0.05 for snow crab (Fig. 3; Table 1). In this sam- 

 ple, there was also a large proportion (39.9%) of other 

 invertebrates consumed. 



During July 1982, in cod sample 5, taken with gillnets 

 set on gravel bottom in shallow water (46-62 m), there 

 were no snow crab (Fig. 4). However, the percentage 

 by weight of toad crab was 51.2%, and the average 

 number of toad crab per cod stomach was 2.0. For sam- 

 ple 6, from the stomach contents of cod also captured 

 by gillnets, but in deeper water (102-1 17 m) on mud 



Sample 5 



Gill Nets 



28 Cod 



07/9- 10/82 



( 4 6 - 6 2 in ) 



1 



Sample 7 



Danish Seine 

 99 Cod 



07/20/82 

 (66m) 



Sample 6 



Gill Nets 



29 Cod 



07/9-10/82 



_( 1 2 - 1 17m) 



Sample 8 



Danish Seine 

 160 Cod 

 07/21/82 

 (68-69m) 



Figure 4 



Percentage by weight of prey categories against total weight 

 of stomach contents from cod sampled in July 1982. Dark bar 

 represents the percentage by weight of total toad crabs (Hyas 

 araneus, H. coarctatus, unidentified Hyas). 



bottom mixed with boulders, the percentage by weight 

 of snow crab was 7.4% and the mean number of snow 

 crab per cod stomach was 0.17 (Fig. 4; Table 1). In com- 

 parison with sample 5, the percentage by weight of 

 toad crab in sample 6 decreased to 14.7% and the mean 

 number of toad crab per cod stomach was 1.65 (Fig. 

 4; Table 1). In cod samples 5 and 6, the major diet 

 percentages of total weight were fish (34.7 and 69.6%, 

 respectively) such as pleuronectids and gadids (Fig. 4). 

 In July 1982, for stomachs of cod taken by Danish 

 seiners over shallow (66-69 m) sandy and muddy bot- 

 toms (Fig. 4, samples 7 and 8), the percentage by 

 weight of snow crab was 2.2 and 13.8%, respectively. 

 This percentage of total weight was lower than that 

 found in cod stomachs taken on similar but deeper 

 (101-141 m) bottoms during spring 1981 and 1982 (Fig. 

 3, samples 1-3). However, the mean number of snow 



