22 



B. B. PARRISH 



abundance in this region. If these spawning products alone form the recruits 

 to the Southern Bight fisheries, the dangers of reduced recruitment to this 

 region are enhanced. If, on the other hand, the spawning products from each 

 of the major North Sea spawning grounds constitute potential recruits to 

 either the northern or southern North Sea fisheries, depending on their 

 growth rate during adolescent life, these dangers are lessened. 



EAST ANGLIA 



I 20 



I ,s 



10 



BUCHANJ 



20- 



^ ID 



VALUES FOB 3»4 YEAR OLX>S. 

 VALUES, mcludcd^ op, 

 OFSYEABOLCS. 



J l_ 



_I_J l_J_J 1_ 



1927 1930 



1934 1944 

 YEAR CLASS 



I950 



Fig. 9. — Estimates of relative strengths of year-classes at three years of age, recruiting the East 

 AngUan and Buchan fisheries respectively in pre-war and post-war years. East Anglian data 

 taken from Gushing, 1959. 



