NOTE Yang and Page: Diet of Somniosus pacificus 



407 



Figure 1 



Locations of sleeper sharks collected in Gulf of Alaska 



lected by longlines is probably caused by regurgita- 

 tion during the long operation (two to six hours) of 

 longline surveys. Our data also indicate that more 

 prey items (e.g. walleye pollock, salmon, rockfish, and 

 snails) were found in stomachs collected by bottom 

 trawls than collected from longlines (mainly arrow- 

 tooth flounder and octopus). Bottom depths (Table 1) 



for the samples collected from bottom trawls were 

 shallower (from 86 to 113 m) than for samples col- 

 lected from longlines (from 240 to 267 ml; bottom 

 depth may also be a factor in the diet variations. 

 Length of the sleeper sharks (Table 1) might also 

 affect their diet; owing to the small sample size, how- 

 ever, no comparisons could be made from our study. 



