H. Kiær. — Tromsøsundets fiske. 169 
and the south-point of the isle of Tromsø varies between 
5 and 60 fathoms. 
North of the isle of Tromsø the depth is 100 fathoms 
and southward in the Balsfiord likewise 100 fathoms. The 
Tromsø Sound and also the Rystream and Sanne Sound 
between Tromsø and Kvalø, a great island west of Tromsø, 
are therefore forming a submarine ridge which greatly 
influences the composition and the temperature of the 
water in the deep cavities inside. I found thus the tem- 
perature of the depth of 70 fathoms on the 15th of Au- 
gust 1903 to be 2,9" C. (the temperature of the surface 
was 13° C.), while the temperature at sea at a depth of 
160 fathoms on the 6th of Septbr. 1902 was 5° C. 
From the open sea come masses of cod, green 
cod, herring, capelan and other pelagian fishes, 
while from the deep channels in the fiords in- and out- 
side of Tromsø fishes stray through the Tromsø Sound. 
