36 



I90Z 



1905 



19M 



1905 



1900 



Doqqer Bank 



Less Than 20 fs. 



;0 25 JO 35 'lO t,5 50 55 



Fig. 27 



analysis of the average 

 total numbers. In cor- 

 roboration of our former 

 results we see further 

 that the number of 

 individuals in the year- 

 groups I — III (Extra 

 Small and Small) have 

 an absolute predomi- 

 nance (cf. pages 18 and 

 22). While examining 

 these figures we must 

 also notice that the large 

 haddocks are more in 

 evidence in the catches 

 per hour on the Dogger 

 Bank than in the other 

 areas. 



It will be of parti- 

 cular interest here to 

 follow the development 

 during the course of the 

 years 1902 — 6 within 

 each particular area, in 

 connection with the oc- 

 currence of the different 

 year-classes. We will 

 begin with area D, 

 where the groupings 

 are most clearly defined 

 (fig. 24). In the summer 

 of 1903 we find here 

 a comparatively small 

 number of individuals 

 spawned in 1902 and a far 

 larger quantity of the 

 year-classes 1901 and 

 1900, which in these 

 delineations cannot be 

 differentiated. During 

 1904 these year-groups 

 develop; the 1902 year- 

 class is still sparsely 

 represented, and it 

 is very striking how 



