-1 1 r 



70 



-! 1 1 1 1 1— 



65 60 



Figure 51 



Spring distribution 

 Fall distribution 

 Concentrations 



Only the 1CX) fathom line is shown. 

 Mercator Projection 



Canada 



_i I I 



J I I I J I 1 L. 



68 



