APPENDIX F; HENKING 



— 26 - 



The cod (Gadus morrhua L.) shows very interesting fluctuations in the quantities, 

 which might lead to the view, that migrations occur between the various regions. I have 

 considered the available data from this standpoint and may therefore sketch out the 

 following picture : in the true summer months, considerably fewer cod occur in the southern 

 North Sea' than at other times (Fig. 15 and 16). They have perhaps, under the influence 

 of the rising temperature, migrated to the Skager Rak, where at the time when the 

 southern North Sea is poor, rich catches are being made (Fig. 17 and 18). The northern 

 North Sea may also recieve immigrants from the south in late summer. 



«tt 



80- 



— 60- 



- 40 



20 



I 2 3 4 S 6 7 8 9 10 tl 12 

 Fig. 19. Ling: South. North Sea, 1902 



I 2 3 4 5 6 7 fi 9 10 II 12 



Fig. 21. Ling; Skager Rak, 1902 



12-345 6 7 8 S 10 II 12 

 Fig. 20. Ling: North. North Sea, 1903 



- 60- 



- 40- 



- 20- 



I 2 3 4 5 6 7 8 9 10 II 12 

 Fig. 22. Ling: Skager Rak, 1903 



The Skager Rak gives off something of its store to the Kattegat, so that an increase 

 takes place here in the first half of the following year; like the southern North Sea, 

 however, the Skager Rak receives a new increase from the north in the months towards 

 the close of the year. 



There is thus an increase in the quantities of the cod in the southern North Sea in 

 the winter months. 



I I speake here only of larger fish, which can be brought to market, Small undersized cod occur in 

 summer also, but J Aq not know in what relative quantities. 



