FISHERY BULLETIN: VOL. 84, NO. 1 



I24°00' 



Figure 1.— Location of study area in Strait of Juan de Fuca off southwestern Vancouver Island. 



Laboratory analysis involved sorting the contents 

 into the classifications outlined in Table 1 by using 

 a low-power binocular microscope. Numbers of 

 organisms in each classification were recorded, if 

 possible, for each individual salmon. Once individuals 

 were counted, displacement volumes (mL) were 

 determined separately for fish contents, for crusta- 



cean contents, and for miscellaneous organisms. If 

 organisms were too digested to assign to individual 

 classifications but could be identified as fish or 

 crustaceans, their volumes were included in either 

 the unidentified fish volume or unidentified crusta- 

 cean volume classification. 

 Two techniques of data analysis were used. 



Table 1.— Percentage of salmon sampled with empty stomachs and average number of prey per fish with non-empty 



stomachs. 



'Other than Parathemisto. 



78 



