FISHES FROM THE SEA-BOTTOM 



445 



between the oceanic sub-tropical waters from the south and the 

 arctic Labrador current from the north. All changes in 

 temperature are therefore on the western side very sharp. On 

 the eastern side the layers are spread out fan-wise, and as a 

 consequence we may at a depth of lOO metres find the same 

 temperature prevailing from north to south over wide areas, as, 



Fig. 312. — Distribution of Temperature in the North Atlantic at a Depth of 

 100 metres. (Drawn by Helland- Hansen.) 



for instance, along the coast of Norway from the North Sea to 

 the North Cape. 



We may now discuss the distribution of the southern and 

 northern species. 



Comparing the percentages of the different species noted in The southern 

 the quantities landed from different geographical areas (see ^p^"^^- 



