gene 
Investigations as to the distribution of the fish in the Norwegian Sea. 
With regard to the Norwegian Sea, the great expanse of water between Greenland, 
Iceland, the North Sea, Norway and Spitzbergen, the numerous hydrographical investi- 
gations have proved the existence of strata of cold Arctic water west of Jan Mayen, 
thus restricting the probable area of movement of boreal species to the waters east 
of there. In Fig. 2, page 7, the shaded stratum. indicating temperature over 2°, 
Nee LE — 
Fig. 1. Distribution of temperature in the North Atlantic at a depth of 100 metres. 
(Drawn by Hettanp-Hansen). 
marks the area to which the horizontal and vertical movement of northern food fishes 
is probably restricted. 
In the course of the Norwegian fishery investigations carried out under my super- 
vision, I have endeavoured in various ways to discover whether any fish move out beyond 
the coastal banks in the temperate upper strata of the Norwegian Sea. Numerous ex- 
periments have been made with drift nets and floating lines, for the most part, however, 
with negative result. Such positive data as were obtained have been published in a 
previous work*) and will be found in Fig. 3, indicating the localities at which the 
*) Jonan Hyorr, Norsk Havfiske II. Del, pp. 184 fi. Bergen 1905. 
Murray and Hsorr, The Depths of the Ocean, p. 648. London 1912. 
