CONTENTS 



Introduction ' 3 



I. Geographical distribution of fishes 3 



1) The deep basin of the Norwegian Sea 4 



2) The deep basin of the Atlantic Ocean and the southern slope of the great marine ridge from 

 Greenland to the North Sea bank 5 



3) Slope of the coastal banks of the North Atlantic towards the North Atlantic basin 7 



4) Depths less than 200 m 8 



5) The migratory pelagic fishes 11 



II. Methods of work and general results 13 



A. Methods of work and apparatus: 



V. Hensen's quantitative hauls of pelagic fish eggs. Catches of the fishermen. The represen- 

 tative statistic. Investigators are obliged to do practical work themselves. Zoological and 

 systematic preliminary investigations of the young fishes. Methods of measuring. The mark- 

 ing of living fishes. Study of races 13 



B. Examples of the results obtained: 



1. Eggs, larvse and young fishes 17 



a. The young stages of the genus Gadus (cod group) 18 



b. The .young stages of the genus Pleuronectes (flounder group) 20 



c. The peculiarities of the Baltic 21 



d. The herring : 22 



2. The older stages of fishes («larger» fishes) 22 



The biology of each separate species of fish must be separately studied 23 



a. Viviparous blenny 23 



b. Plaice 23 



c. Cod 23 



3. Other results 24 



a. New regions of fishing 24 



b. New economically important species of animals. Pandalus borealis. Nephrops norvégiens. 

 Ommatostrephes todarus 24 



c. How to make as much as possible from the productivity of the sea. Restrictive 

 regulation ■. 24 



d. Hatching. Transplantation of small plaice 25 



III. Natural history of the cod , 27 



1) Spawning period 27 



2) Natural history of the cod during its first year 33 



3) Rate of growth, migrations and the fisheries of the cod 37 



