RELATIVE STRENGTH 



^ (VJO 



o ■--» V <-> -N \m "^ Ni «* "<» ^ ^ Rs "^ 

 Figure 7. — Relative strength of the different year classes of the haddock: 



in the North Sea, Broken line A shows the actual proportional numbers, 

 lino B is constructed from the averages of three continuous series 

 of points of line A» 53 



