14 



B. B. PARRISH 



The herring concentrations on which these fisheries are based are composed 

 during the period May-July of feeding, maturing herring, which later spawn 

 either on grounds off the Scottish east coast in August-September, on the 

 Dogger Bank in September-October, or in the Southern Bight in Novem- 



EAST ANGLIA 



BUCHAN 



I930-I933 



I930-I933 



I9i8 1947 1950 



YEAR 



Fig. 6.— Percentage age compositions and abundance indices of three, four and older age groups 

 in the East AngUan and Buchan pre-spawning fisheries respectively (1930-8 and 1947-57). 

 East Anglian data taken from Gushing, 1959. 



