POPULATION DYNAMICS OF THE ATLANTIC HERRING 15 



ber-December. Small concentrations of Atlanto-Scandian herring, mostly of 

 age-groups three to five also contribute to the fished stock in the northerly 

 regions to the east of the Shetlands. This fishing region therefore constitutes a 



EAST ANGLIA 



1935-34 1934-55 ^35-36 . ^6:37 195^58 ' 9^48. ^48:4? ^49^. mi- M^- !?52:53. 1953^. 195455. K5^. !?56^- 



y£^ARS 



Fig. 



7. — Estimated total mortality rates of year-classes fished in the East Anglian and Buchan 

 - pre-spawning fisheries in the periods 1933-8; 1947-57- East AngUan values estimated from 

 Table i in Gushing, 1959. (Zero values represent negative estimates). 



major feeding ground for the main body of herring which subsequently 

 spawn in different parts of the North Sea. 



The 'adult' components of these concentrations invade the north-western 

 North Sea from the east and south in May, and remain in this region as 



